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					     ELECTRICAL EQUIPMENT:

     ENVIRONMENTAL                                          TEST          PROCEDURES


     1.               INTRODUCTION

                    This document contains a collection of 71 environmental test
                    procedures.

                    The procedures apply to climatic, mechanical, electrical or other
                    environmental type tests, which are specified for equipment type
                    products as part of the quality assurance.

                    Each procedure has two pages and refers to an international test
                    method. It gives an equipment/application category with a
                    belonging detailed test procedure, including severity.

                    The procedures are aimed at the common situation, where it is not
                    possible to perform a detailed environmental analysis in order to
                    tailor an optimum test plan. In these cases, the procedures can
                    be a tool for specification writers, simplifying their work. The
                    procedures can be referred to or even included in specifications.

                    The procedures are examples, not requirements, unless they are
                    referred to in some specific context, and they should not be used
                    when test requirements are already given by reievant authorities
                    or organizations.

                    The    document       contains    the   following   chapters:

                             1.      INTRODUCTION

                             2.     GUIDANCE

                            3.      SURVEY     OF    PARAMETERS

                            4.      SURVEY     OF    PROCEDURES

                            5.      PROCEDURES
                                    Climatic    Procedures
                                    Mechanical    Procedures
                                    Electrical    Prodedures
                                    Miscellaneous     Procedures




    published by                                    keywords                        classification
    NORDTEST                                        environmental    test           UDC 696.6
Postadress:       Tel (nat): (09) 455 4600          electronic    equipment
Tekniikantie 12   Tel (int): +358 9 455 4600        specification
FIN-02150 ESBO    Fax: +358 9 455 4272              test procedures
Finland           www.nordtest.org
     TABLE OF CONTENTS                 PAGE

1.   INTRODUCTION

2.   GUIDANCE                           3
     2.1 General                        3
     2.2 Selecting Procedures           4
     2.3 The Contents of a Procedure    7
     2.4 Environmental Testing          8

3.   SURVEY OF PARAMETERS               11
     3.1 Climatic Parameters            11
     3.2 Mechanical Parameters          12
     3.3 Electrical Parameters          13
     3.4 Miscellaneous Parameters       14

4.   SURVEY OF PROCEDURES               15
     4.1 Climatic Procedures            15
     4.2 Mechanical    Procedures       19
     4.3 Electrical Procedures          23
     4.4 Miscellaneous Procedures       27

5.   PROCEDURES                         29
     5.1 Climatic Procedures            29
     5.2 Mechanical Procedures          75
     5.3 Electrical Procedures         123
     5.4 Miscellaneous Procedures      161




                                -1-
2.    GUIDANCE

2.1   General

      For the different environmental parameters, a number of reprodu-
      cible, idealized test methods have been standardized internatio-
      nally. These methods give a choice from a limited number of
      discrete standard severities (levels, time-variations, durations,
      etc.).

      The final choice of severity and detailed test procedure for a
      given product is left to the specification writer. This choice is
      not standardized in the general case, as it depends very much on
      the specific product and usually involves many important non-
      technical considerations.

      Here the enclosed procedures may be seen as a comprehensive set
      of examples of how the choices can be made for different equip-
      ment applications.

      Each procedure gives on two pages, for a given test method, an
      equipment/application category with a belonging detailed test
      procedure, including severity.

      The potential users of the procedures include environmental spe-
      cialists involved with non-specialists in selecting, evaluating
      or performing environmental tests.

      The procedures are intended to be a tool for the specification
      writers in order to simplify their work. The procedures can be
      referred to or even included in specifications, with or without
      alterations. The procedures should thereby provide a much needed
      aid in today's specification efforts.

      It must be emphazised, that from an engineering point of view the
      most correct way to establish test specifications is to start
      from scratch with a detailed statistical analysis of environmen-
      tal conditions, etc. SECTION 2.4 gives a short introduction to
      the guidances and the standards published in the field.

      The procedures are aimed at the more common situation, where such
      efforts are not possible, due to limited resources regarding time
      and money, or due to too many unknown factors in the final appli-
      cations of a new product.

      Wherever possible, the severities of the procedures are correl-
      lated with IEC 721, which contains tables of parameter values
      appearing in the environment. In these cases the procedures will
      be the result of performing the transformation from environmental
      values to test severities.




                                    -3-
      The procedures are primarily aimed at sequential type tests,
      where you verify the performance of the final design, using one
      or two products taken from the production line.

      The procedures are not requirements, until someone actually
      refers to them in some specific context, and they should not be
      used when test requirements are already given by relevant autho-
      rities or organizations. Products with essential functions for
      health or security will often fall in this category.

      Procedures for testing unintended electrical emissions from
      equipment are not included.

      In the future it is hoped that it will be possible to supplement
      with more procedures. The practical use of this catalogue is very
      much dependent on the number of procedures. The number of proce-
      dures published at this stage, however, should be sufficient to
      prove the usefulness of the procedures.


2.2   Selecting    Procedures

      The method for selection of procedures is very simple: It is
      simply a question of looking them through and pick out the proce-
      dures found relevant.

      The procedures are organized in four main groups: Climatic, me-
      chanical, electrical and miscellaneous parameters.

      Within each main      group,   the   procedures     are   sorted   according   to
      test   parameters.

      FIG. 1 overleaf illustrates the organisation. The procedures have
      been given serial numbers congruent with these divisions.

      CHAPTERS 3 and 4 give surveys of parameters and individual proce-
      dures respectively. By looking in these, it will intially be
      possible to exclude large numbers of procedures from the search.

      The   recommended    systematic   approach   will    be   as   follows:

      1.     Collect as much information as possible about the product.
            Basic product specifications, brochures etc. If physically
            possible, place the product in front of you.

            If the product is subject to test requirements imposed by
            authorities, the test specifications shall be available.

            Notice that systems consisting of separate units, such as
            control units with transducers, may require different proce-
            dures for some of the test parameters.
     The organisation of the procedures




             MISCELLANEOUS                     I
                    r\
                         ELECTRICAL                          I
                            \

                                MECHANICAL
                                                                       I
                                      \

                                              CLIMATIC

                                                       Survey of procedures

                                                                 Survey of parameters
                                                                                        I
                                                                           Guidance




procedures sorted
on number

                                      \   c
           “Table of contents”   1
                                                   .

           short description of
           environmental parameters
           and their effects
                                              ------+    1
                                          “Manual”      -




                                      Figure 1



                                              -5-
     Also keep in mind, that a product has different life-parts,
     storage, shipment, transportation, operational use, etc. The
     importance of the different environmental parameters will be
     different in the different life-parts.

2.   Look through CHAPTER 3, "Survey of Parameters". This is a
     list of environmental (test) parameters with about 5 lines
     describing their characteristics, including damaging ef-
     fects. Here the reader may sort out some parameters on the
     basis of his particular equipment and its known use. Make a
     list of the remaining relevant parameters.

3.   Look through those parts of CHAPTER 4, "Survey of Proce-
     dures" which are still relevant after the previous step 2.
     Here is given a brief list of procedures for each parameter,
     describing the procedure in a couple of lines. At this point
     the user will be left with a limited list of candidate pro-
     cedures.

4.   Look through the remaining candidate procedures. The final
     choice of procedure must be based on the text of the proce-
     dure itself. The contents of each procedure must be viewed
     as a whole, but the initial search can be based on "SCOPE"
     and "OBJECT" in that order.

5.   Each procedure has a point 7. "ADDITIONAL INFORMATION RE-
     QUIRED". This relates to functional and physical configura-
     tions of the product during the testing. These informations
     must be written down, even if they seem self evident to the
     person with a good knowledge of the product. Attach the in-
     formation to the procedure or vice versa.

     Also look at the other points of the procedure. General pro-
     cedures will always need a critical scrutiny when applied to
     a specific product.

6.   In step 2 above a parameter was found to be relevant, but it
     was not possible to find a corresponding procedure relevant
     for the specific product. This situation will occur, and the
     only way out is to prepare a new procedure, preferably in
     consultation with a specialist on environmental testing. A
     close, near-relevant procedure can provide a good framework
     for the discussion. (Together, of course, with the documents
     mentioned in SECTION 2.4).

     It is essential that the user makes sure that the procedures
     he choses are suitable to his needs. In any case of doubt, a
     specialist should be consulted.

7.   Finally, a sequence of the tests must be established. IEC
     68-l contains a discussion of this topic. It is often neces-




                             -6-
            sary to base the choice on pure planning considerations, i.e.
            availability of products, test facilities and personnel.


2.3   The Contents of a Procedure

      All procedures are arranged in the same format:

      Initially a header is given, starting with the test method fol-
      lowed by a few words describing the scope, i.e. equipment/ap-
      plication.

      Next the text is arranged in 8 sections with standard titles.

      The titles are given below, together with a description of the
      text or the intention of the text.

      "1.   SCOPE"

      Test method xxx has a limited number of different standard seve-
      rities. It also has a number of different procedures depending on
      the type of equipment tested. In this place is written a typical
      category of equipment/applications, known from experience to fall
      into one group concerning the detailed procedure and severity of
      this "test xxx". The description of the equipment/application
      category here can be worded in "test xxx-terminology", and should
      be kept as broad as possible without altering the following
      points.

      "2. OBJECT OF TEST"

      States the purpose of the test. The same equipment/application
      could have different procedures depending on the purpose of the
      test. Verify functions during exposures or just confirm survival.
      The types of failures or signs of degradation typical for test
      xxx should be shortly mentioned here. The reader with a specific
      equipment in his mind should be supplied with a number of key-
      words to help him decide whether this procedure is relevant for
      his purposes.

      "3. RELATED DOCUMENTS"

      First of all the IEC publication or other standard is given
      which defines the general test method. This is the document which
      is the basis of the test procedure. This is followed by a short
      list of other related documents giving background information and
      environmental class, if relevant.

      "4.   TEST     EQUIPMENT"

      The test facilities required to comply with the standard referred
      to above.



                                    - 7 -
      Major   characteristics, tolerances and auxilliary instrumentation.
      The text shall provide the non-expert with a picture of the ef-
      forts involved in performing this test.

      "5.   PROCEDURE"

      Initially a description of the mounting or    installation in the
      test facility typical for this category of    equipment. Next a step
      by step procedure. Numbers giving severity   level are not given,
      but are named here. Reference can be given    to a figure below.

      "6. SEVERITY"

      Only one severity level shall be given here, relating to the ap-
      plication/object stated above. The notation shall be as used in
      the standard for the test method.

      At this place there should preferably be a figure, illustrating
      the procedure and severity.

      "7.   ADDITIONAL   INFORMATION   REQUIRED"

      A check list is given for additional, product specific infor-
      mation required before testing, i.e. functional tests during
      exposures, visual inspection, etc.


      "8. REPORT"
      This is a fairly standard text stating minimum requirements for
      what should be included in the test report.


2.4   Environmental Testing

      Environmental testing is a tool used for a long time to increase
      the function performance and the reliability of equipment and
      components. Today it is also widely used as a specification
      method together with performance data, and is included in the
      type approval tests.

      The benefits of environmental testing as a specification method
      in comparison with other methods are the flexibility. New con-
      struction methods and components can easily be incorporated in
      new products without waiting for standardization. However, whe-
      never possible, specified (CECC, MIL-STD) components shall be
      used. This will guarantee that the components have controlled
      high enviromental resistance.

      Environmental test methods are described in IEC Publications
      68-x-xx. These documents cover the most important methods like
      heat, cold, humidity, salt mist, rain, sun radiation, vibration,




                                       -8-
mechanical shock, etc., together with guidances. They who only
want to specify tests according to these methods may find all
necessary information in a single sheet summary collection, IEC
68-4.

Different environmental tests may be combined, in order that two
or more influencing factors are acting upon the equipment simul-
taneously (combinded tests) or in a close succession (composite
test). However, normally a test program contains several tests,
which shall be performed in a sequence with unspecified time
interruptions between the tests.

The electromagnetic environmental test methods are not covered in
the IEC-68 documents, but may be found elsewhere. International-
lY, the IEC 801-x Publications are frequently used but national,
military and product standards are also often referred to. This
situation will be dramatically changed within a few years, since
an intense activity in international standardization working
groups is going on.

The natural environment includes many climatic, mechanical and
other influencing factors. In some cases it is convenient to make
an environmental profile of the life cycle of the equipment. Ex-
pected extreme values under different conditions may be found in
IEC Publication 721-x-x, "Classification for environmental condi-
tions". These documents shall be used when the environment has not
been analysed otherwise, for example by measurements.

When the expected influences are mapped, the environmental test
methods and severities are decided upon.

This method of specifying tests is called "tailoring" and is
often used in military and space applications. It is described in
the military standard MIL-STD 810D. Tailoring may be both time-
consuming and costly, especially when measurements have to be
done.

The normal method of establishing a test program is to take es-
tablished test methods and severities from other product fields
used in comparable environments. Many industries have their own
standard requirements, which they apply to all products. Clas-
sification societies have requirements of electronic equipments
on ships. Many product standards include environmental testing
requirements. NORDTEL has developed a transformation method to
find the test severity level from an assumed environment for
IT-equipment.

When testing during the development phase of an equipment, the
requirements are not fixed. The aim of the test is to find weak
points and to improve the construction (TAF-tests: "Test-analyse-
fix).




                              -9-
A special application of environmental testing is screening (ESS:
"Environmental stress screening"). These tests are performed on
each produced unit and the purpose is to sort out bad samples.
The technique used, is to expose the unit to a very heavy en-
vironment (often temperature change or random vibration) during a
short time (in order not to decrease the life time). By this
method the "early fault"- frequency of the product is reduced.

Simply by fulfilling relevant environmental test requirements, it
is possible to reach a very high reliability of your product.
However, a 100% security will never be reached by this method.
When absolute security it required, special fault-tolerant con-
struction   methods, like redundant circuits and corresponding
software methods, must be used.

The attempts to unify the national standards on products have
resulted in a lot of so-called "harmonization documents" published
by CENELEC (the European electrical standardization committee).
The documents IEC 68, 721, and 801 have all been harmonized, with
a few exceptions, and the member states of CENELEC are by mutual
agreement obliged to use these methods, whenever environmental
testing is called for in product standards. The product stan-
dards are also going to be harmonized, but it will take many
years until a total harmonization within the CENELEC countries
has been reached.




                             -10-
3.    SURVEY OF PARAMETERS

      The procedures are grouped according to environmental parameters
      as given in the following list.

      By reading through this list, the user may be able to exclude a
      number of parameters, based on the check-list text given for each
      parameter. This will make it easier to find relevant procedures
      for a given product.

      The naming and division of the parameters follow mainly the one
      used in the international standards.


3.1   Climatic Parameters

      COLD

      Determines short term functional effects or long term ageing ef-
      fects: Electrical (semi-conductor) bias, high viscosity, chemical
      reaction time (LCD), material embrittlement and thermal contrac-
      tions, accumulation of ice, etc.

      DRY HEAT

      Determines short term functional effects or long term ageing ef-
      fects: Electrical (semi-conductor) bias, low viscosity, fast che-
      mical reaction times, oxidation, material softening and thermal
      expansions, accumulation of ice, etc.

      DAMP HEAT, STEADY STATE

      Determines the long term effects of constant high humidity at an
      elevated    temperature, where condensation of water does not occur.
      Principal effects are moisture absorption, increase in electrical
      conductivity, electrolytic corrosion, swelling of materials (pla-
      stics), etc.

      DAMP HEAT, CYCLIC

      Determines the effects of water condensation produced by high air
      humidity during changing temperatures. Especially relevant for
      "tight" enclosures. Humidity on optics, blocking of delicate
      mechanical   parts, electrical conductivity increased, etc.

      CHANGE OF TEMPERATURE

      Repeated, reversing material stresses are produced by different
      thermal expansion rates and coefficients. Mechanical or electri-
      cal failures due to physical misalignments. Cracking of mate-
      rials, damage to seals, etc.




                                   -11-
      MISCELLANEOUS
      Low air pressure, for instance during air-freight, may produce
      very high forces on non-resilient, air-tight enclosures or
      membranes. Solar radiation can produce surface degradation and
      discolouration in addition to severe differential heating.


3.2   Mechanical Parameters

      SINE     VIBRATION

      Most relevant for equipment/transducers mounted to rotating ma-
      chinery, where vibration will be mainly at a single pronounced
      frequency. Also used for measuring vibration response of equip-
      ment for any application.

      RANDOM       VIBRATION
      Vibration of a non-periodic nature with many frequency components
      present: Transportation, traffic, mounted where many sources con-
      tribute to the vibrations. Effects are normally associated with
      (simultaneous) resonances: Material fatigue and wear, short/open
      circuits, microphony, internal collisions.

      TRANSIENT,    VIBRATION
      Relevant for equipment in fixed mounting on resilient structures
      with may be set in motion by direct collisions or wind gust, or
      the structure may amplify nearby shocks from floor (traffic) or
      from wall (slamming doors). The effect is an oscillating shock.

      BUMP

      Equipment mounted to structures, that are subject to small, repe-
      titive shocks from the same direction, or equipment in vehicles,
      either mounted or being transported. Failures typically due to
      accumulating displacements in joints, etc.

      SHOCK

      Shocks are typically associated with mounting on doors    and simi-
      lar moving parts subjected to slamming or impacts, as    on crane or
      elevator systems. Also experienced by equipment inside   package-
      /cushioning during fall. Testing is aimed at ultimate    strength of
      members and joints, relays switching, etc.

      FREE FALL, DROP & TOPPLE

      Free fall is the ultimate, critical test of the combination of an
      equipment and its package. Also used for hand-held units, re-




                                   -12-
      quired to survive free falls. Standards require fall against
      steel or concrete surface. Fall against softer surfaces (carpet,
      soil) may be better simulated by a suitable shock test. Drop and
      topple tests correspond to those knocks and jolts ocurring on
      equipment during table top repair work or rough use.

      MISCELLANEOUS

      Manual operation of switches, levers, keyboard buttons, etc. may
      cause severe mechanical wear and stress on many types of equip-
      ment. Cable bending tests are relevant for many types of inter-
      connected systems. Weak points may be the cable itself and/or its
      clamping in connectors.


3.3   Electrical Parameters

      TRANSIENTS

      Electronic equipment with attached signal- and power cables are
      subjected to conducted electrical high-voltage transients induced
      on the cables. The transients can have quite different energy-
      /voltage/repetition characteristics according to their different
      origin: Sudden load changes in the power network, strikes of
      lightning in the region or spark-currents from near-by discon-
      nected inductive loads. The term “transients" covers a range of
      test methods reflecting these different types of transients.

      CONDUCTED SUSCEPTIBILITY

      Although transients are normally also regarded as conducted
      disturbances, only continuous disturbances are found under this
      heading in this report. The continuous type of disturbances may
      be picked up by power and signal leads from nearby equipment and
      cables, or from transmitters. The disturbance frequency may be
      from audio to several hundreds of megahertz.

      RADIATED SUSCEPTIBILITY

      These tests are relevant to electronic equipment both with and
      without attached cables. Strong electromagnetic fields may be
      produced from portable or vehicle installed transmitters operated
      nearby, as well as from stationary broadcast or radar transmit-
      ters.

      ELECTROSTATIC DISCHARGE

      These tests are relevant for electronic equipment regularly ope-
      rated by humans. Very large instantaneous currents can arise when
      a person discharges by contact with the equipment. This is espe-
      cially the case with low air humidity.




                                    -13-
      POWER SUPPLY

      The tests in this group relate to the interface between an elec-
      tronic equipment and external, general power supply systems. The
      tests aim at expected irregularities in mains AC supply or (low
      voltage) DC supplies, concerning voltage levels, interruptions
      and frequency deviations for AC supply.


3.4   Miscellaneous Parameters

      SALT MIST

      Used for demonstrating the corrosive effects in metallic mate-
      rials and for indication of the quality and uniformity of protec-
      tive coatings. IEC test Ka is a continuous accelerated test suit-
      able for materials, and test method Kb is a cyclic test more rea-
      listic for electronic equipment and components.

      WATER

      Water tests cover environments from falling drops to impacting
      water and immersion. If ingress of water is considered a failure
      in itself, the degree of protection provided by an equipment en-
      closure can be given by an IP-class number according to IEC 529.
      Otherwise the tests can indicate the functional tolerance to the
      amount of water present in different parts of an equipment.

      DUST AND SAND

      The effects of sand or dust are abrasion, erosion, seizure,
      clogging, thermal insulation, etc. Different test methods vary
      from free settling of fine dust to strong horizontal airflow with
      large quantities of abrasive dust and flue ash.

      CORROSIVE ATMOSPHERES

      Industrial polluted atmospheres contain many chemically active
      gases. The reproducible test methods include exposure to sulphur
      dioxide and exposure to hydrogen sulphide. These test methods aim
      mainly at the quality of electrical contacts and connectors.




                                   -14-
4.      SURVEY OF PROCEDURES

4.1     Climatic Procedures

4.1.1   Test Method: COLD

        C101 Mechatronic Equipment in Ground Vehicle in Cold Climate
        IEC 68-2-1, Test Aa
        Function, -4O°C/16 h

        Equipment installed externally on any kind of ground vehicle in
        a cold climate. Example: Actuators for opening/closing windows,
        roof hatches, antennas.

        Cl02 Electronic Equipment in Railway Carriage in Cold Climate
        IEC 68-2-1, Test Ad
        Function, -4O°C/16 h, +5°C/2 h

        Electronic equipment in rail vehicles. Correct function automati-
        cally achieved at operating temperature, after switched on at the
        extreme low temperature.

        C103 Equipment Installed on Open Deck on Board Ships
        IEC 68-2-1, Test Ab
        Function, -25°C/6 h

        Instrumentation and automation equipment installed on open deck
        on board ships. Procedure is according to Det Norske Veritas,
        Certification Notes No. 2.4, March 1988.

        C104 Equipment Installed Outdoors in Cold Climate
        IEC 68-2-1, Test Ad
        Function, -4O°C/16 h

        Electrical equipment installed outdoors in shelters, in a cold
        climate. Examples: kWh-meters, traffic controls, alarm systems.

        C105 Electronic Equipment for Normal Indoor Use
        IEC 68-2-1, Test Ad
        Function, +5°C/16 h

        Electronic equipment for use indoors in offices, homes, labora-
        tories, etc. Examples are personal computers, measuring instru-
        ments, and consumer electronics.


4.1.2    Test Method: DRY HEAT

        C201 Equipment in Railway Carriages in Warm Temperate Climate
        IEC 68-2-2, Test Bd
        Function, 7O°C/2 h, 55°C/16 h




                                      -15-
        Electronic equipment in rail vehicles. Correct function automati-
        cally achieved at operating temperature, after switch-on at the
        extreme high temperature.

        C202 Electronic Equipment for Desktop Use Indoors
        IEC 68-2-2, Test Bd
        Function, 4O°C/2 h, 55°C/72 h

        Electronic equipment for use indoors in offices, homes, labora-
        tories etc. Examples are personal computers, measuring instru-
        ments, and consumer electronics.

        C203 Equipment Installed Outdoors in Warm Temperate Climate
        IEC 68-2-2, Test Bd
        Function, 55°C/72 h

        Electrical equipment installed outdoor in shelters, in a warm
        temperate climate. Examples: kWh-meters, traffic controls, alarm
        systems.

        C204 Equipment Installed in Instrument Panels in Vehicles
        IEC 68-2-2, Test Bd
        Function, 85°C/16 h

        Instrumentation in instrument panels in motor vehicles. The in-
        strumentation may be exposed to hot air from the heating system.
        Exposure to sun radiation is only occasionally, i.e. not mounting
        on top of panel.

        C205 Equipment Stored in not Temperature Controlled Locations
        IEC 68-2-2, Test Ba
        Function, 7O°C/72 h

        Equipment expected to be stored in (partially) weather protected
        locations without active temperature control.

        C206 Equipment Installed on Vehicle Transmission Parts
        RSVFS 1985:8, IEC 68-2-2, Test Bb
        Function, +lOO°C/48 h, 125°C/(1/2) h

        Applicable to components and devices installed on transmission
        parts of road vehicles, excluding hot parts of brakes and automa-
        tic gear boxes.


4.1.3   Test Method: DAMP HEAT, STEADY STATE

        C301 Electronic Security Central Units, Indoors
        IEC 68-2-3, Test Ca
        93% RH/40°C/4 days




                                      -16-
        Electronic equipment installed indoors in receptions, halls, etc.
        Examples are fire and burglar alarm central units.

        C302 Control and Monitoring Units Installed in Industry
        IEC 68-2-3, Test Ca
        93% RH/40°C/21 days

        Equipment installed in laundries, food processing or similar
        humid locations in industry.

        C303 Process Control System, Indoors
        IEC 68-2-56, Test Cb
        85% RH/30°C/4 days

        Larger stationary equipment installed indoors. Examples are pro-
        cess control systems and similar computers/systems with complex
        electrical interconnections with other equipment.


4.1.4   Test Method: DAMP HEAT, CYCLIC

        C401 Equipment Installed Outdoors in Nordic Country - Climates
        IEC 68-2-30, Test Db
        Variant 1, 93% RH/55°C/6 cycles

        Equipment installed outdoor in Nordic country - climates. Equip-
        ment installed in cabinets without temperature regulation. Exam-
        ples are petrol pumps, traffic controls, etc.

        C402 Control and Monitoring Units Installed in Industry
        IEC 68-2-30, Test Db
        Variant 1, 93% RH/55°C/6 cycles

        Control and monitoring units installed in laundries, food pro-
        cessing or similar locations in industry.

        C403 Electrical Equipment in Coupé Compartment of Vehicles
        IEC 68-2-30, Test Db
        Variant 1, 93% RH/55°C/2 cycles

        Electrical equipment in motorcars, installed inside coupé com-
        partment. An example is a taxameter.

        C404 Portable Equipment for Indoor Use
        IEC 68-2-30, Test Db
        Variant 1, 93% RH/40°C/6 cycles

        Portable equipment for use in partially controlled indoor loca-
        tions. In a protective case, the equipment may be transported and
        stored in weather-protected locations without temperature control.




                                         -17-
4.1.5    Test Method: CHANGE OF TEMPERATURE

        C501 Mechatronics Transported in Cold Climate
        IEC 68-2-14, Test Nb
        -4O°C/+7O°C/S cycles

        Mechatronic equipment transported/stored in shipping package in
        a cold climate. Transitions between indoor and outdoor locations.
        (Test is without package)

        C502 Magnetic Mass Storage Device, Indoor, Vehicle
        IEC 68-2-14, Test Nb
        +5°C/+40°C/5 cycles

        Magnetic mass storage devices located indoors, but occasionally
        subjected to temperature transients while operating.

        C5O3 Electronic Equipment Used in Ground Vehicles
        IEC 68-2-14, Test Nb
        -40°C/+30°C/5 cycles

        Electronic equipment installed in ground vehicles, excluding
        engine   compartment. An example is a mobile radio telephone.

        C504 Portable Equipment, Use in Weather-protected and
        Non-weather-protected Locations
        IEC 68-2-14, Test Na
        -40°C/+30°C/5 cycles

        Portable equipment to be transferred between indoor and outdoor
        locations during normal use. Transfers are assumed to be in
        switch-off condition.


4.1.6   Test   Methods:   MISCELLANEOUS

        Procedures for other climatic test methods are not included at
        present.




                                          -18-
4.2       Mechanical Procedures

4.2.1      Test Method: VIBRATION SINE

          M101 Electronic Equipment Installed in Railway Carriages
          IEC 68-2-6, Test Fc
          1 g, 100 Hz, 2 h/axis

          Electronic equipment installed in railway carriages, excluding
          installation in engine compartments, on boogies, etc. Examples are
          equipment for communication, display, air-conditioning, etc.

          M102 Electronic Equipment Installed near Rotating Machinery
          IEC 68-2-6, Test Fc
          5 g, 500 Hz, 3x20 sweep cycles

          Control and monitoring units of moderate size, for mounting near
          rotating machinery in general, excluding special, severely vi-
          brating machinery.

          M103 Transducer Units Installed on Rotating Machinery
          IEC 68-2-6, Test Fc,
          10 g, 2000 Hz, 3 h/axis

          Smaller units such as transducers for fixed mounting on rotating
          machinery in general. The units, weighing typically less than
          0.5 kg, have their own mounting flanges.

          M104 Instrumentation and Automation Equipment Installed on Ships
          IEC 68-2-6, Test Fc
          0.7 g, 100 Hz, 2 h/axis

          Instrumentation and automation equipment installed on board
          ships: Bridge, deck, bulkhead, beams. Procedure is according to
          Det Norske Veritas, Certification Notes No. 2.4, March 1988.


4.2.2 Test Method: RANDOM VIBRATION

          M201 Electronic Security Central Units Installed in Buildings
          IEC 68-2-36, Test Fdb
          0.16 grms, 150 Hz, 3x30 min.

          Electronic security central units installed in buildings, halls,
          receptions etc. Not applicable to transducers and similar smaller
          units.

          M202    Electronic Equipment Installed in Railway Carriages
          IEC    68-2-36, Test Fdb
          0.7    grms, 150 Hz, 3x2 h




                                           -19-
           Electronic equipment installed in railway carriages, excluding
           installation in engine compartments, on boogies etc. If approved,
           this method can cover the requirements of rail authorities.

           M203 Instrumentation and Automation Equipment Installed on Ships
           IEC 68-2-36, Test Fdb
           O.7 grms,   100 Hz, 3x30 min.

           Instrumentation and automation equipment installed on board
           ships, bridge, deck, bulkhead, beams. Procedure is according to     D
           Det Norske Veritas, Certification Notes No. 2.4, March 1988.

           M204 Electronic Units for Installation on Production Machinery
           IEC 68-2-36, Test Fdb
           1.9 grms, 500 Hz, 3x90 min.

           Control and monitoring units of moderate size for fixed mounting
           on production machinery in general. Not mounted directly to ro-
           tating or moving parts.

           M205    Electronic Equipment for Desktop Use
           IEC    68-2-36, Test Fdb
           O.7    grms, 150 Hz, 3x90 min.

           Equipment for free-standing, desktop use in offices, homes and
           laboratories. Occasionally switched off and moved for use in dif-
           ferent location.

           M206. Equipment in Package for Public Shipment
           IEC 68-2-36, Test Fdb
           1 grms, 150 Hz, 3x90 min.

           Equipment in package for public shipment. Final transport on
           lorry to destination assumed. Weight typically less than 80 kg.

          M207     Vehicle Installed and Portable Electronic Equipment
          IEC     68-2-36, Test Fdb
          l.7     grms, 500 Hz, 3x30 min.

          Vehicle installed electronic equipment, also intended for ver-
          satile portable use. An example is a mobile radio telephone.


4.2.3 Test Method: TRANSIENT VIBRATION

          M301 Electronic Unit Mounted on Non-rigid Structure
          IEC 68-2-57, Test Ff
          RRS/Q=10: 30 g, ZPA: 10 g




                                           - 20 -
        Electronic equipment such as control or display units for fixed
        mounting on non-rigid structures. The mounting structure is occa-
        sionally excited to oscillating motion by impacts from adjacent
        traffic, wind-gust etc.


4.2.4    Test Method: BUMP

        M401 Equipment Installed in Railway Carriages
        IEC 68-2-29, Test Eb
        10 g, 16 ms, 3x1000

        Electronic equipment installed in railway carriages, excluding
        installation in engine compartments, on boogies, etc. Examples are
        communication and air-conditioning equipment.

        M402 Electronic Equipment Installed on Stationary Structures
        IEC 6.8-2-29, Test Eb
        5 g, 6 ms, 3x100

        Delicately constructed electronic equipment in fixed installa-
        tions, where the effects of small impacts/bump cannot be disre-
        garded.

        M403 Electronic Units Mounted on Production Machinery
        IEC 68-2-29, Test Eb
        40 g, 6 ms, 3x1000

        Control and monitoring units of moderate size for fixed mounting
        on production machinery in general. Not mounted directly to ro-
        tating or moving parts.

        M404 Equipment in Package for Public Shipment
        IEC 68-2-29, Test Eb
        25 g, 6 ms, 3x1000

        Equipment in package for public shipment. Final transport by
        lorry to destination assumed. Weight typically less than 80 kg.


4.2.5    Test Method: SHOCK

        M501 Equipment Mounted on Door or Similar Movable Part
        IEC 68-2-27, Test Ea
        100 g, 6 ms.

        Equipment such as control units for mounting on doors or similar
        moving parts, where rapid velocity changes are caused by slamming
        or stopping impacts. Excluding minor units like transducers in
        special shock-intense locations.




                                      -21-
         M502 Equipment to be Shipped in Package
         IEC 68-2-27, Test Ea
         50 g, 11 ms.

         Equipment to be shipped in package. Testing is without the
         package, and will demonstrate if the equipment is suitable for
         being packed in a normal, average package/cushioning.

        M503 Electronic Units Mounted on Machinery
        IEC 68-2-27, Test Ea
        200 g, 1 ms.

        Smaller units, such as transducers, for mounting on production
        lines or handling machinery in general. Excluding mounting
        directly on hammer heads etc.

        M504 Hand-carried Units, Simulation of Free Fall
        IEC 68-2-27, Test Ea
        500 g, 2 ms.

        Simulation of free fall of hand-carried units in resilient
        carrying case or towards a resilient surface. More reproducible
        than direct free fall, but without testing of outer case for hard
        point impacts.


4.2.6   Test Methods: FREE FALL and DROP & TOPPLE

        M601 Equipment in Package for Public Shipment
        IEC 68-2-32, Test Ed
        0.6-1.2 m, 12 falls.

        Equipment in package for public shipment, where free falls may
        occur during loading or unloading.

        M602 Portable Used Electronic Equipment
        IEC 68-2-32, Test Ed
        0.25-1 m, 12 falls.

        Hand-portable equipment required to survive free falls due to
        rough use conditions. Examples are portable phones and radiation
        meters.


4.2.7   Test   Methods:   MISCELLANEOUS

        M801 Electrical Apparatus for Potentially Explosive Atmosphere
        EN 50 014 with Amend. 3

        Impact test for equipment in explosive atmospheres, where safety
        relies on an endurable/flame proof encapsulation. Procedure is
        not applicable to equipment for use in mines.



                                          - 22 -
4.3        Electrical Procedures

4.3.1 Test Methods: TRANSIENTS

          E101 Burst Test: Digital Equipment installed in Railway Carriages
          IEC 801-4
          2 kV

          Burst test for control, communication or monitoring units in-
          stalled in railway vehicles.

          E102 Burst Test: Digital Equipment Installed in Industrial Plants
          IEC 801-4
          4 kV

          High severity of burst test, for equipment such as digital con-
          trol units in heavy industry, where the consequence of failure
          could be serious.

          E103 Surge Test: Industrial Process Control Equipment
          SS 436 15 03
          3 kV, 0.2 Joule, 3/polarity

          Surge test, non-operational, for industrial electronic equipment
          with signal and control lines. The transients are intended to
          cover lightning and switching in the power network. Not appli-
          cable to circuits with direct connection to overhead telelines
          or power lines.

          E104 l-MHz Test: Industrial Process Control Equipment
          SS 436 15 03

          l-MHz transient test for industrial process control equipment,
          which may be subjected to transients on attached power and
          signal cables due to power switching in the vicinity.

          E105 Spark Test: Industrial Process Control Equipment
          SS 436 15 03

          Spark test for industrial process control equipment, which may
          be subjected to transients on attached power cables and signal
          cables due to switching relays and contactors.

          E106 Surge Test: Electronic Security Equipment
          SS 436 15 03, Class PL 4
          5 kV

          Surge test, non-operational, for the mains cables of fire alarm
          and burglar alarm central units. The transients are intended to
          cover lightning and switching in the power network.




                                        -23-
4.3.2 Test Method: CONDUCTED SUSCEPTIBILITY

          E201 Mains Frequency Disturbance: Industrial Process Control
          Apparatus
          SS 436 15 03

          Mains frequency disturbance test for electronic control and mea-
          suring equipment installed in light/normal industry. The proce-
          dure is relevant for equipment with signal cables up to a length
          of approximately 100 m.

          E202 High Frequency Voltages: Electronic Control Equipment on Ships
          MIL-STD 462, Test CS 02, Lloyd's Register
          10 kHz - 50 MHz, 1 Vrms

          High frequency disturbance voltage for electronic equipment
          installed on board ships. Disturbances are injected into attached
          cables only, assuming that direct radiation is not relevant due
          to shielding on ship. The procedure is in accordance with Lloyd's
          Registers Type Approval Scheme 1985.


4.3.3     Test Methods: RADIATED SUSCEPTIBILITY

          E301 Electromagnetic Fields: Immunity of Security Central Units
          in Buildings
          IEC 801-3
          27-1000 MHz, 3 V/m

          Electronic equipment installed in buildings with some shielding
          from tranmitters and where the operation of portable transceivers
          is not probable. Examples are fire and burglar alarm central
          units.

          E302 Electromagnetic Fields: Instrumentation and Automation
          Equipment Installed on Board ships
          IEC 801-3
          30 kHz - 200 MHz, 10 V/m

          Instrumentation and automation equipment installed on board ships.
          The procedure is according to Det Norske Veritas, Certification
          Notes No. 2.4, March 1988.

         E303 Electromagnetic Fields: Electrical Equipment Installed Outdoors
         IEC 801-3
         27-1000 MHz, 10 V/m

         Electronic equipment installed outdoors with no special protection
         against electromagnetic radiation. Examples are kWh-meters, traf-
         fic controls, petrol pumps, etc.




                                        -24-
        E304 Electromagnetic Fields: Immunity of Electronic Measuring
        Equipment
        IEC 801-3
        0.1-1000 MHz, l-3 V/m

        Electronic measuring instruments used in trade. Directly appli-
        cable to weighing instruments subject to official metrological
        control, as defined in OIML R 76-l.


4.3.4   Test Method: ELECTROSTATIC DISCHARGE

        E401 Equipment for Desktop Use in Offices, Homes, and Laboratories
        IEC 801-2
        8 kV

        Electronic equipment for desktop use in offices, homes and labo-
        ratories, where no special precautions have been taken to avoid
        electrostatic charging of personnel.

        E402 Microprocessor Controlled Measuring Equipment
        IEC 801-2
        6-8 kV

        Microprocessor measuring instruments in industry and trade, where
        no special precautions have been taken to avoid electrostatic
        charging of personnel.


4.3.5    Test Methods: POWER SUPPLY

        E501 Mains Supply Variations: Equipment in Urban Areas in
        Industrialized Countries
        OIML International Doc. No. 11
        Voltage: +10/-15%, Frequency: ± 2%

        Mains supply variations for equipment in urban areas in industri-
        alized countries. An example is electronic weighing instruments
        in retail business.

        E502 Short Time Mains Reductions: Equipment in Urban Areas in
        Industrialized Countries
        OIML Intrnational Doc. No. 11
        Voltage: 0-50-80%

         Mains supply reductions for equipment in urban areas in industri-
         alized countries. An example is electronic weighing instruments
         in retail business.




                                          -25-
        E503 DC-voltage: Detectors in Burglar Alarm Systems
        IEC 839-l-3, Test A-8

        DC-supply test for detectors in burglar alarm systems or similar
        transducers or terminals with local, weak DC-supply system.

        E504 AC-supply: Equipment Installed on Ships with 220 V AC
        Mains Network

        Instrumentation and automation equipment installed on board ships
        having a mains network of nominally 220 V, 50 Hz or 60 Hz. Proce-
        dure is according to Det Norske Veritas, Certification Notes No.
        2.4, D.5.1.


4.3.6   Test   Methods:   MISCELLANEOUS

        Procedures for other electrical test methods are not included at
        present.




                                          -26-
4.4     Miscellaneous Procedures

4.4.1    Test Method: SALT MIST

        X101 Indoor Installations on Ship and Off-shore Applications
        IEC 68-2-52, Test Kc
        Severity: 2 (3 days total)

        Equipment installed in sea environments, ships, off-shore plat-
        forms, etc. Equipment protected from direct sea-water.

        X102 Equipment Installed Outdoor on Ship, Harbour, Roadside
        IEC 68-2-52, Test Kc
        Severity: 1 (21 days total)

        Equipment installed outside in sea environments, on ships, har-
        bours or installed close to roadlanes being salted in the winter-
        time.


4.4.2    Test methods: WATER

        X201 Enclosure: Immersible Proof Portable Electronic Equipment
        IEC 529
        X7, 1 m/30 min.

        Immersible proof portable equipment, for which the resistance to
        water is based on the tightness of its enclosure.

        X202    Water Jets: General Water Tightness Test for Enclosures
        and    Equipment
        IEC    529
        X5,    3 m

        Enclosures or equipment to be used in conditions of massive
        splashing water, solid water spray or moderate jets from water
        hoses.

        X203 Falling Drops: Control Units and Monitoring Units, not
        Humidity Controlled
        Indoor Locations
        IEC 68-2-18, Test R
        Method RA2: Drip box.

        Applicable to stationary equipments indoors which may be sub-
        jected to falling drops due to condensation or leakage from sur-
        faces above.




                                        -27-
4.4.3   Test Methods: DUST and SAND

        Procedures for dust and sand are not included at present.


4.4.4   Test Methods: CORROSIVE ATMOSPHERES

        X401 Sulphur Dioxide: Equipment Outdoors in Polluted, Moist
        Environment
        ISO/TC 156 WG 7 n 38, method A
        SO2 : 1 ppm

        Equipment for installation and use in moist polluted environ-
        ments.

        X402 Sulphur Dioxide and Hydrogen Sulphide: Equipment Outdoors
        in Polluted, Moist Environment
        ISO/TC 156 WG 7 n 38, method C
        H2S/S02: 0.5/l ppm

        Equipment for installation and use in moist polluted environ-
        ments.

        X403 Hydrogen Sulphide: Installations in Clean Environment
        IEC 68-2-43, Test Kd
        H2S: 10 ppm

        Equipment for installation and use in clean areas such as air-
        conditioned rooms. The procedure can also cover the use of silver
        contacts in polluted areas.


4.4.5   Test   Methods:   MISCELLANEOUS

        Procedures for other miscellaneous       test   methods   are   not
        included at present.




                                          -28-
nordtest method                             NT ELEC
                                            Approved 1990-06




     5.    PROCEDURES

     5.1   Climatic   Procedures




                                   - 29 -
nordtest method                                                       NT ELEC C101
                                                                      Approved 1990-06




ENVIRONMENTAL TEST PROCEDURE:


COLD TEST: MECHATRONIC EQUIPMENT IN GROUND VEHICLE IN COLD CLIMATE


1. SCOPE:         This procedure applies   to    mechatronic equipment installed
                  externally on any kind    of    ground vehicle used in a cold cli-
                  mate. Typical examples   are    remotely controlled actuators
                  for opening or closing    of    roof hatches, windows, and motor
                  driven antennas.


2. OBJECT         To make sure that the product functions correctly at the
   OF TEST:       lowest rated temperature. Malfunction could typically be
                  associated with blocking of movable parts due to incorrect
                  choice of materials, lubricants, etc.


3.    RELATED     The test is performed according to:
     DOCUMENTS:
                  -    IEC 68-2-1, Test Aa, Cold for non-heat-dissipating speci-
                       men with sudden change of temperature.

                  Other related documents are:

                  -     IEC 68-3-1, Background information.
                  -     IEC 721-3-5, Ground Vehicle Installations.


4. TEST           Temperature chamber capable of maintaining the specified tem-
   EQUIPMENT:     perature in working space within the tolerances given in
                  IEC 68-2-1.


5.   PROCEDURE:   1) The test chamber shall be at the low temperature speci-
                     fied.

                  2) The specimen is introduced into the chamber, in a con-
                      dition ready for use, but switched off.

                  3) Time is now allowed for the chamrber conditions to be re-
                      established and for the specimen to reach temperature sta-
                     bility.

                  4) The specimen is switched on, and a functional test is per-
                     formed according to the relevant specification.




                                        -31-
                                                     C101


                 5)       The specimen shall be switched off and exposed to the low
                          temperature for the time specified.

                 6)       At the end of this period, a functiona1 test is again per-
                          formed.

                 7)       The specimen switched on is now placed under standard
                          ambient atmospheric conditions until it has been de-
                          frosted. The function is monitored during this period.

                 8)       The specimen is checked visually, electrically, and mecha-
                          nically.                                                   -


6. SEVERITY:         Temperature:            -40°C
                     Duration :               16 h

                 + 23°C


                               \
                                   \
                                       \             -40°C
                                           ‘*
                                               F              F
                                             I         16 h
                                             t=
                                                     OFF          ON




7. ADDITIONAL    Before testing the following details shall be specified:
   INFORMATION
   REQUIRED:     -       Functional tests before/during/after exposure.
                 -       Covers or lids to be open or closed if relevant.
                 -       Functional mode(s) in switch-on condition.


8. REPORT:       A test report shall be prepared, containing at least:

                 -       Identification of equipment tested, test facilities used
                         and date of test.
                 -       Description of physical set-up in chamber (photo).
                 -       Recording of temperature profile.
                 -       Results of functional checks and visual inspections.
                 -       Signatures of responsible test engineers.




                                                   -32-
nordtest method                                                       NT ELEC C102
                                                                      Approved 1990-06




ENVIRONMENTAL TEST PROCEDURE:


COLD TEST: ELECTRONIC EQUIPMENT IN RAILWAY CARRIAGE IN COLD CLIMATE


1. SCOPE:          This procedure is intended for electronic equipment installed
                  in rail vehicles in the Nordic countries and similar cold cli-
                  mates. It is assumed that the equipment is installed in a com-
                  partment where heating is normally applied, but the equipment
                  may be switched on at an extreme low temperature, i.e. normal
                  function shall be achieved automatically after a temperature
                  rise to normal operating temperature.


2. OBJECT         To verify that the low temperature does not cause irreversible
   OF TEST:       damages in the switch-on condition, and to ascertain that
                  switching on and subsequent function is possible without
                  failures at normal operating temperature.


3. RELATED              The test is performed according to:
   DOCUMENTS:
                  - IEC 68-2-1, Test Ad, Cold for heat-dissipating specimen
                    with gradual change of temperature.

                  Other related documents are:

                  -     IEC    68-3-1, Background information.
                  -     IEC    571, Rules and regulations for electronic equipments
                        used    on rail vehicles.
                  -     IEC    721-3-5, Ground vehicle installations.


4. TEST            Temperature chamber capable of maintaining the specified tem-
   EQUIPMENT:      perature in working space within the tolerances given in
                   IEC 68-2-l.


5. PROCEDURE:     The test is carried out as a sequential exposure to
                  two different temperatures.

                  1)    The specimen is introduced into the chamber and a func-
                        tional test is performed after stabilization at standard
                        atmospheric conditions for testing.

                  2)     With the equipment switched off, the temperature is
                        decreased to the specified low level, which is then kept
                        for the specified duration.




                                           -33-
                                                          C102


                 3)         Immediately before the end of exposure, the equipment is
                            switched on, and the temperature is increased.

                 4)         When the temperature has reached +5°C, this temperature is
                            kept for at least 2 h after which a functional check is
                            performed.

                 5)         After exposure, and after stabilization at standard atmos-
                            pheric conditions, a final functional test is carried out.


6. SEVERITY:     Temperature:                  -40°C             Duration:               16 h
                 Temperature:                  +5°C              Duration:               2 h


                            F                                                        F
                     23°C    1




                       .,fy
                      -\  -40°C


                                          I         16h            1   I-2h-i
                                    OFF                            I   -        ON   -




7. ADDITIONAL    Before          testing      the   following    details        shall     be    specified:
   INFORMATION
   REQUIRED:     -          Functional  tests  before/during/after exposure.
                 -          Covers or lids to be open or closed if relevant.
                 -          Functional mode(s) in switch-on condition.


8.   REPORT:     A test report shall be prepared, containing at least:

                 -          Identification of equipment tested, test facilities used,
                            and date of test.
                 -          Description of physical set-up in chamber (photo).
                 -          Recording of temperature profile.
                 -          Results of functional checks and visual inspections.
                 -          Signatures of responsible test engineers.




                                                       -34-
nordtest method                                                     NT ELEC C103
                                                                    Approved 1990-06




ENVIRONMENTAL TEST PROCEDURE:


COLD TEST: EQUIPMENT INSTALLED ON OPEN DECK ON BOARD SHIPS

1. SCOPE:         This procedure applies to instrumentation and automation equip-      n




                  ment installed on the open deck on board ships.


2. OBJECT         To demonstrate capability of correct function in environments
   OF TEST:       normally to be expected on board ships.


3. RELATED         The test is performed according to:
   DOCUMENTS:
                  -    Det norske Veritas, Certification Notes No. 2.4, Type
                       Approval of Instrumentation and Automation Equipment,
                       March 1988; D.9 Cold Test, Class D.

                  Other related documents are:

                  -    IEC   68-2-1, Test Ab, Cold for non-heat-dissipating speci-
                       men   with gradual change of temperature.
                  -    IEC   68-3-1, Background information.
                  -    IEC   721-3-6, Ship environment, Class 6K4.


4. TEST           Temperature chamber capable of maintaining the specified tem-
   EQUIPMENT:     perature in working space within the tolerances given in
                   IEC 68-2-l.


5. PROCEDURE:     1)   The test specimen is introduced into the chamber, and a
                       functional test is performed after stabilization at stan-
                       dard atmospheric conditions for testing.

                  2)   With the equipment switched on, the temperature is
                       decreased to the specified low level.

                  3)   The equipment shall then be switched off, and remain off
                       for the specified duration at low temperature.

                  4)   At the end of this period the specimen shall be func-
                       tionally checked, and the power shall be on during the
                       temperature rise.

                  5)   The specimen shall be removed from the chamber and remain
                       under standard atmospheric conditions until defrosted.




                                         -35-
                                             C103


                 6)      The specimen shall be switched on and measured during the
                         recovery period.

                 7)       The specimen shall be visually inspected and electrically
                         and mechanically checked.


6. SEVERITY:         Temperature: -25°C ±2°C
                      Duration : 6 h




                            1
                            F


                                ~-~
                                  I-             6h     - I
                                      F                   F



7. ADDITIONAL    Before    testing   the   following   details   shall   be   specified:
   INFORMATION
   REQUIRED:     -       Functional  tests  before/during/after exposure.
                 -       Covers or lids to be open or closed if relevant.
                 -       Functional mode(s) in switch-on condition.


8. REPORT:       A test report shall be prepared, containing at least:

                 -       Identification of equipment tested, test facilities used,
                         and date of test.
                 -       Description of physical set-up in chamber (photo, drawing,
                         etc.).
                 -       Recording of the test profile monitored.
                 -       Results of functional tests and visual inspections.
                 -       Signatures of responsible test engineers.




                                             -36-
                                                                            NT ELEC Cl04
nordtest method                                                             Approved 1990-06




ENVIRONMENTAL   TEST    PROCEDURE:


COLD TEST:       EQUIPMENT INSTALLED OUTDOORS IN COLD CLIMATE


1. SCOPE:          This procedure applies to electrical equipment installed out-
                   doors in cold climate in shelters, which give some protection
                   against extremely low temperatures by self-heating. Examples of
                   equipment are electronic kWh-meters, traffic control, alarm
                   systems, etc.


2. OBJECT          To set minimum requirements for correct function, when exposed
  OF TEST:         to the lowest probable temperature in which it will operate.
                   The use in extreme temperature condition is so rare that it
                   will be ignored.


3. RELATED         The test is performed according to:
   DOCUMENTS:
                   -       IEC 68-2-1, Test Ad, Cold for heat-dissipating specimen
                           with gradual change of temperature.

                   Other    related   documents   are:

                   -       IEC 68-3-1, Background information.
                   -       IEC 721-3-4, Classification of environmental condition.
                           Installed equipment.

4. TEST            Temperature chamber capable of maintaining the specified tem-
  EQUIPMENT:       perature in working space within the tolerances given in
                   IEC 68-2-l.

5. PROCEDURE:      1)      A functional test is performed after stabilization in
                            standard atmospheric condition for testing.

                   2)      The test object is placed in the chamber in switch-on
                           state, and the temperature is decreased to the specified
                           value.

                   3)      If functional tests are made at intermediate temperatures
                           the equipment shall be stabilized at least 2 h at each
                           temperature.




                                             -37-
                                           Cl04


                  4)     After specified duration a functional test is made and the
                        temperature is increased to ambient and a final test is
                        carried out after stabilization in standard atmospheric
                        condition for testing.


6.   SEVERITY:    Temperature:     -40°C
                  Duration :        16 h




                                                                              1
                                                                              F



                                       kl- 16 h                I
                                                               F

                  t = time necessary for test object to reach stabilisation



7.   ADDITIONAL        The relevant specification may state that the cold test
                       shall follow after a humidity test within 1-2 h.

                  -    The relevant specification may state stabilization         in
                       switch-off state if this condition is probable.


8.   REPORT:           A test report shall be prepared, containing at least:

                  -    Identification of equipment tested, test facilities used,
                       and date of test.
                  -    Description of physical set-up in chamber (photo).
                  -    Recording of temperature profile.
                  -    Results of functional checks and visual inspections.
                  -    Signatures of responsible test engineers.




                                            -38-
                                                                           NT ELEC Cl05
nordtest method                                                            Approved 1990-06




ENVIRONMENTAL    TEST     PROCEDURE:


COLD TEST:      ELECTRONIC EQUIPMENT FOR NORMAL INDOOR USE


1. SCOPE:
-                   Electrical equipment for personal use indoors in offices, homes,
                    laboratories etc., where temperature is regulated to suit per-
                    sonnel. Severity corresponds to lowest temperature normally
                    kept in these circumstances.

                    Examples    of     equipment:

                     l      Office automation equipment as PCs      and   terminals,
                     l      Laboratory  measuring  instruments,
                     -      Electronic equipment in homes.


2. OBJECT           To verify that the low temperature does not cause irreversible
   OF TEST:         damages to the switch-off equipment, and to ascertain that
                    switching on and subsequent function is possible without fail-
                    ures.


3. RELATED          The test is performed according to:
   DOCUMENTS:
                     -      IEC 68-2-1, Test Ad, Cold for heat-dissipating        specimen
                            with gradual change of temperature.

                    Other    related    documents   are:

                     -      IEC 68-3-1, Background information.
                     -      IEC 721-3-3, Stationary use at weather-protected           loca-
                            tions, Class 3K2.


4. TEST             Temperature chamber capable of maintaining the specified tem-
   EQUIPMENT:       perature in working space within the tolerances given in
                    IEC 68-2-l.


5. PROCEDURE:        1)     A functional test is performed in chamber after stabiliza-
                            tion at standard conditions for testing.

                    2)      With the equipment switched off, the temperature is
                            decreased to the specified low level, which is then kept
                            for the specified duration.




                                                - 39   -
                                               Cl05


                 3)     Immediately before end of exposure, the equipment is
                        switched on, and a functional test is carried out.

                 4)     After exposure, and after stabilization at standard    con-
                        ditions, a final functional test is carried out.


6.   SEVERITY:   Temperature:       +5°C
                 Duration :          16 h




                         23°C   ;


                                        I   -16       h-   I
                                                           F




7. ADDITIONAL  Before testing the following details shall be specified:
   INFORMATION
   REQUIRED:     -    Functional  tests  before/during/after exposure.
                 -    Covers or lids to be open or closed if relevant.
                 -    Whether a warm-up period is allowed between switch-on and
                      functional test.


8.   REPORT:          A test report shall be prepared, containing at least:

                 -      Identification of equipment tested, test facilities used,
                        and date of test.
                 -      Description of physical set-up in chamber (photo).
                 -      Recording of temperature profile.
                 -      Results of functional checks and visual inspections.
                 -      Signatures of responsible test engineers.




                                            - 40 -
A




                                                                         NT ELEC C201
    nordtest method                                                      Approved 1990-06




    ENVIRONMENTAL     TEST    PROCEDURE:


    DRY HEAT TEST:      EQUIPMENT IN RAILWAY CARRIAGES IN WARM TEMPERATE CLIMATE


    1. SCOPE:            This procedure is intended for electronic equipment installed
                         in rail vehicles in the Nordic countries and similar warm tem-
                         perate climates. The equipment may be switched on at a relati-
                         vely high temperature, which may occur locally in stopped
                         carriages in the summer season. After a lower normal operating
                         temperature has subsequently been reached, the equipment is
                         required to achieve a specified functional performance automa-
                         tically.


    2. OBJECT            To ascertain that no permanent damages are introduced if equip-
       OF TEST:          ment is switched on at an extreme high temperature, and to verify
                         the functional requirements at a specified upper operating
                         temperature.


    3. RELATED           The test is performed according to:
       DOCUMENTS:
                         -       IEC 68-2-2, Test Bd, Dry heat for heat-dissipating speci-
                                 men with gradual change of temperature.

                         Other    related   documents   are:

                         -       IEC 68-3-1, Background information.
                         -       IEC 571, Rules and regulations for electronic equipments
                                 used on rail vehicles.
                         -       IEC 721-3-5, Ground vehicle installations.


    4. TEST              Temperature chamber capable of maintaining the specified tem-
       EQUIPMENT:        perature in working space within the tolerances given in
                         IEC 68-2-2.


    5.   PROCEDURE:      The test is carried out as a sequential exposure to two dif-
                         ferent  temperatures:

                         1)      A functional test is performed after stabilization at
                                 standard atmospheric conditions for testing.

                         2)      With the equipment switched off, the temperature is in-
                                 creased to the specified extreme temperature, which is
                                 then kept for 2 h.




                                                   - 41 -
                                                  C201


                  3)       The equipment is switched on, and the temperature is
                           lowered to the specified temperature of normal operation.
                           This temperature is then kept for the specified duration.

                  4)       Immediately before the end of this exposure, a functional
                           test is carried out.

                  5)       After exposure, and after stabilization at standard
                           atmospheric conditions, a final functional test is carried
                           out.


6. SEVERITY:      Temperature:           -70°C            Duration:      2 h, switched on.
                  Temperature:            55°C            Duration:     16 h, normal function.


                                      7 0 °C                   F




                       ---OFF   -                     ON
                                         I




7. ADDITIONAL    'Before    testing     the    following    details   shall   be   specified:
   INFORMATION
   REQUIRED:      -      Functional tests before/during/after exposure.
                  -      Covers or lids to be open or closed if relevant.
                  -      Functional mode(s) in switch-on condition, if more                     than
                         one is possible.


8.   REPORT:          A test report shall be prepared, containing at least:

                  -      Identification of equipment tested, test facilities used,
                         and date of test.
                 -       Description of physical set-up in chamber (photo).
                 -       Recording of temperature profile.
                 -       Results of functional checks and visual inspections.
                 -       Signatures of responsible test engineers.




                                                 - 42 -
                                                                      NT ELEC C202
nordtest method ’                                                     Approved 1990-06




ENVIRONMENTAL   TEST    PROCEDURE:


DRY HEAT TEST: ELECTRONIC EQUIPMENT FOR DESKTOP USE INDOORS

1. SCOPE:          Electrical equipment for personal use indoors in offices,
                   homes, laboratories etc., where temperature is regulated to
                   suit personnel. A certain window area allows direct sun
                   radiation. It is assumed that air-blowers are not built-in.
                   Examples of equipment: Office automation equipment as PCs and
                   terminals, laboratory measuring instrument and electronic
                   equipment in homes.


2. OBJECT          To verify the correct functioning at the highest temperature
   OF TEST:        where equipment might be used, at least for a short time, and
                   to ascertain that no permanent damages are introduced if equip-
                   ment is left in switch-on condition for a couple of days in
                   intense sun.


3. RELATED         The test is performed according to:
   DOCUMENTS:
                   -       IEC 68-2-2, Test Bd, Dry heat for heat-dissipating speci-
                           men with gradual change of temperature.

                   Other    related   documents   are:

                   -       IEC 68-3-1, Background information.
                   -       IEC 721-3-3, Stationary use at weather-protected loca-
                           tions, Class 3K2.


4. TEST           Temperature chamber capable of maintaining the specified tem-
   EQUIPMENT:     perature in working space within the tolerances given in
                  IEC 68-2-2.


5. PROCEDURE:      1)      A functional test is performed after stabilization at
                           standard atmospheric conditions for testing.

                  2)       The temperature is increased. A functional test is per-
                           formed at an intermediate temperature, after stabilization
                           for 2 h.

                  3)       With the equipment still in the switch-on state, the
                           temperature is increased to the specified level, which is
                           then kept for the specified duration.




                                             - 43   -
                                             C202


                 4)   After exposure, and after stabilization at standard                   con-
                      ditions, a final functional test is carried out.


6. SEVERITY:     Temperature                :         55°C         Duration:      72 h
                 Functional test at
                 intermediate   temperature:          40°C         Duration:      2 h




7. ADDITIONAL    Before   testing   the   following    details   shall   be   specified:
   INFORMATION
   REQUIRED:     -     Functional tests before/during/after exposure.
                 -    Covers or lids to be open or closed if relevant.
                 -    Functional mode(s) in switch-on condition, if more                   than
                      one is possible.


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities used,
                      and date of test.
                 -    Description of physical set-up in chamber (photo).
                 -    Recording of temperature profile.
                 -    Results of functional checks and visual inspections.
                 -    Signatures of responsible test engineers.
                                                                       NT ELEC C203
nordtest method                                                        Approved 1990-06




ENVIRONMENTAL    TEST        PROCEDURE:


DRY HEAT TEST: EQUIPMENT INSTALLED OUTDOORS IN WARM TEMPERATE CLIMATE


1. SCOPE:           This procedure applies to electrical equipment installed out-
                    doors in warm temperate climate conditions in shelters, which
                    may be exposed to the sun.

                    Examples       of     equipment   are:

                    -          electronic kWh-meters
                    l          traffic control
                    -          alarm systems, etc.


2. OBJECT           To set minimum requirements for correct function when exposed
    OF TEST:        to the highest probable temperature in which it will operate.
                    The use in extreme temperature condition is so rare that it
                    will be ignored.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    -          IEC 68-2-2, Test Bd, Dry heat for heat-dissipating speci-
                               men with gradual change of temperature.

                    Other        related    documents    are:

                    l          IEC 68-3-1, Background information.
                    -          IEC 721-3-4, Classification of environmental condition.
                               Installed  equipment.


4. TEST             Temperature chamber capable of maintaining the specified tem-
   EQUIPMENT:       perature in working space within the tolerances given in
                    IEC 68-2-2.


5. PROCEDURE:           1)     A functional test is performed after stabilization at
                               standard atmospheric conditions for testing.

                    2)         The test object is placed in the chamber in switch-on
                               state and the temperature is increased to the specified
                               value.




                                                      - 45   -
!I


                                                  c203


                      3)    If functional tests are made at intermediate temperatures
                            the equipment shall be stabilized at least 2 h at each
                            temperature.

                      4)    After specified duration a functional test is made and the
                            temperature is decreased to ambient, and a final test is
                            carried out after stabilization in standard condition for
                            testing.


     6. SEVERITY:     Temperature:       +55°C
                      Duration :          72 h

                      The test profile is shown on the diagram.

                                                                                   F
                                                                +55°C             1


                                                            -72h-
                                                                                       F
                                                                                       I


                      t = time necessary for test object to reach stabilisation



     7. ADDITIONAL    -    The relevant specification may state stabilization in
        INFORMATION        switch-off state during part of the test.
        REQUIRED:


     8. REPORT:       A test report shall be prepared, containing at least:

                      -    Identification of equipment tested, test facilities used,
                           and date of test.
                      -    Description of physical set-up in chamber (photo).
                      -    Recording of temperature profile.
                      -    Results of functional checks and visual inspections.
                      -    Signatures of responsible test engineers.




                                                   -   46   -
                                                                           NT ELEC C204
nordtest method                                                            Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


DRY HEAT TEST: EQUIPMENT INSTALLED IN INSTRUMENT PANELS IN VEHICLES


1. SCOPE:            This procedure applies to measuring instruments installed in
                     the instrument panel in motor vehicles. The equipments may be
                     exposed to hot air from the heating system and occasionally
                     from sun radiation. It is not applicable to instruments located
                     on the top surface of the instrument panel.


2. OBJECT            To examine the resistance of the equipment to high temperature.
   OF TEST:


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     -       IEC 68-2-2, Test Bd, Dry heat for heat-dissipating speci-
                             men with gradual change of temperature.

                     Other    related   documents   are:

                     -       IEC   68-3-1, Background information.
                     -       IEC   721-3-5, Ground vehicle installation.


4. TEST              A temperature chamber able to create a free air condition of
   EQUIPMENT:        specified temperature ±2°C in a space large enough to hold the
                     EUT.


5.   PROCEDURE:      1)      A functional test is performed after stabilization in
                             standard atmospheric conditions for testing. The test
                             shall include a calibration of suitable accuracy.

                     2)      The equipment is placed in the temperature chamber and
                             shall be supplied from a power source of nominal voltage
                             during the entire test.

                     3)      The temperature is increased to the specified and after
                             stabilization the EUT is exposed to the high temperature
                             for the specified time.

                     4)      If required a functional test and a calibration is made.
                             The temperature is then decreased to ambient.




                                               - 47 -
                                          C204


                 5)   After stabilization      the   functional   testing   and   calibration
                      are repeated.

                 6)   A visual inspection is made. Dimensional changes, cracks,
                      sealing failures, and other mechanical changes are noted.


6.   SEVERITY:   Temperature:   +85°C
                 Duration :      16 h


7. ADDITIONAL    -     After the test the measurement error shall be within
   INFORMATION        normal limits. If wider limits are accepted this shall be
   REQUIRED:          specified.

                 -    If functional test and calibration shall be made at high
                      temperature, it shall be stated in the test program
                      together with the required accuracy at high temperature.


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities used,
                      and date of test.
                 -    Results of functional checks and visual inspections.
                 -    Signatures of responsible test engineers.




                                        - 48   -
                                                                      NT ELEC C205
nordtest method                                                       Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


DRY HEAT TEST: EQUIPMENT STORED IN NOT TEMPERATURE CONTROLLED LOCATIONS


1.   SCOPE:          This procedure applies for electronic equipment expected to be
                     stored in weather-protected or partially weather-protected
                     locations, which do not have temperature control. The equipment
                     may be packed or unpacked during storage.


2. OBJECT            To ascertain that no permanent changes are introduced to the
   OF TEST:          performance of the test item by changing physical properties or
                     dimensions of the used materials.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     l       IEC 68-2-2, Test Da, Dry heat for non-heat-dissipating
                             specimen with sudden change of temperature.

                     Other    related   documents   are:

                     l       IEC 68-3-1, Background information.
                     l       IEC 721-3-1, Storage, Class lK5.


4. TEST              A temperature chamber capable of maintaining the specified tem-
   EQUIPMENT:        perature in working space within the tolerances given in IEC
                     68-2-2.


5.   PROCEDURE:      1)      After a functional test in standard ambient conditions,
                             the equipment is placed in the test chamber, the
                             atmosphere of which is at the specified temperature.

                     2)      The specimen is maintained in the chamber in the switch-
                             off state for the specified time.

                     3)      At the end of this exposure time the specimen is placed at
                             the room temperature.

                     4)      Within 2 h after exposure, in standard atmospheric con-
                             ditions, a visual examination and functional test are
                             carried out.




                                               - 49 -
                                            C205


6. SEVERITY:     Temperature:       +7O°C
                 Duration :          72 h


7. ADDITIONAL    Before   testing   the   following   details   shall   be   specified:
   INFORMATION
   REQUIRED:     -    Visual examinations before/after exposure.
                 -    Functional tests before/after exposure.
                 -    Is the specimen packed or unpacked during exposure.


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities used,
                      and date of test.
                 -    Recording of temperature profile.
                 -    Results of functional checks and visual inspections.
                 -    Signatures of responsible test engineers.




                                          - 50 -
                                                                         NT ELEC C206
nordtest method                                                          Approved 1990-06




ENVIRONMENTAL   TEST     PROCEDURE:


DRY HEAT TEST: EQUIPMENT INSTALLED ON VEHICLE TRANSMISSION PARTS


1. SCOPE:          This procedure applies to components and devices installed on
                   transmission parts on road vehicles. It is not applicable to
                   components directly attached to automatic gear boxes or to the
                   hot parts of the brake system. It is directly applicable as a
                   type approval test on odometers mounted in the wheel centre.


2. OBJECT          To examine the resistance and performance of the equipment to
   OF TEST:        high  temperature.


3. RELATED             The test is performed according to:
   DOCUMENTS:
                   -       "Normer och specifikationer för kilometerräknarapparatur,
                            RSVFS 1985:8”.

                   Other    related   documents   are:

                   -       IEC 68-2-2, Test Bb, Dry heat for non-heat-dissipating
                           specimen with gradual change of temperature.
                   -       IEC 68-3-1, Background information.
                   -       IEC 721-3-5, Ground vehicle installation.


4. TEST            A temperature chamber capable of creating a free air condition
   EQUIPMENT:      of specified temperature ±2"C in a space large enough to hold
                   the EUT. Test equipment able to use at high temperature in
                   order to perform functional tests.


5. PROCEDURE: 1 )          A functional test according to the test specification is
                           performed after stabilization in standard atmospheric con-
                           ditions for testing.

                   2)      The equipment is placed in the temperature chamber and
                           shall be running during the entire test.

                   3)      Exposure according to the severity below is performed.

                   4)      The temperature is then decreased to ambient.

                   5)      After stabilization the functional test according to the
                           test specification is made.




                                             - 51   -
                                                   C206


                  6)     A visual inspection is made. Dimensional changes, cracks,
                         sealing failures, and other mechanical changes are noted.


6. SEVERITY:      Temperature:         +lOO°C                 Duration:   48 h
                  Temperature:          +125°C                Duration: 1/2 h

                       140                                                             30 min

                  o    120
                  0




                       20
                             0    10         20          30     40       50       60

                                             Exposuretime      h



7. ADDITIONAL     Before     testing   the    following        details    shall    be     specified:
    INFORMATION
    REQUIRED:     -      After the test, the performance shall be as specified.
                  -      If functional test shall be made at high temperature, it
                         shall be stated in the test program together with the per-
                         formance requirements at high temperature.


8. REPORT:        A test report shall be prepared, containing at least:

                  -     Identification of equipment tested, test facilities used,
                        and date of test.
                  -     Results of functional checks and visual inspections.
                  -     Signatures of responsible test engineers.




                                                  - 52    -
                                                                      NT ELEC C301
nordtest method                                                       Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


DAMP HEAT, STEADY STATE: ELECTRONIC SECURITY CENTRAL UNITS, INDOORS

1.   SCOPE:          Electronic equipment such as fire and burglar alarm central
                     units installed indoors in receptions, halls, etc. This proce-
                     dure is not intended for smaller peripheral units, such as
                     transducers, which may have to be installed under more severe
                     conditions in any kind of rooms.


2. OBJECT            To demonstrate that adsorption or absorption of humidity does
   OF TEST:          not cause malfunction i.e. false alarms or no alarm. This test
                     allows time for the diffusion of humidity to show its possible
                     effects on electrical resistance, swelling of materials, etc.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     -        IEC 68-2-3, Test Ca, Damp heat, steady state.

                     Other    related   documents   are:

                     -       IEC 68-2-28, Guidance for damp heat tests.
                     -       IEC 721-3-3, Stationary use at weather-protected
                             locations.


4. TEST              Climatic chamber capable of maintaining the specified humidity
   EQUIPMENT:        and temperature in working space within the tolerances given in
                     IEC 68-2-3


5.   PROCEDURE:      1)      After a functional test at standard ambient conditions,
                             the equipment is placed in the test chamber, wired to
                             the peripheral units required for correct function.

                     2)      With the equipment switched off, the specified exposure
                             is commenced.

                     3)      Immediately before the end of exposure a functional test
                             is carried out. The equipment is switched off.

                     4)      Within 2 h after exposure, at standard atmospheric con-
                             ditions, a final functional test is carried out.




                                               - 53 -
                                          C301


6. SEVERITY:     Temperature:   +4O°C
                 Duration :      4 days
                 Humidity :      93% RH    ±3%




                           1                      I


                           I         4 days       I-2h-1




7. ADDITIONAL    Before testing the following details shall be specified:
   INFORMATION
   REQUIRED:     -    Functional  tests  before/during/after exposure.
                 -    Whether a time period is allowed between switch-on and
                      functional test during exposure.
                 -    Covers or lids to be open or closed if relevant.


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities used,
                      and date of test.
                 -    Description of physical set-up in chamber (photo).
                 -    Recording of temperature and humidity profile.
                 -    Results of functional checks and visual inspections.
                 -    Signatures of responsible test engineers.




                                      - 54 .
                                                                     NT ELEC C302
nordtest method                                                      Approved 1990-06




ENVIRONMENTAL    TEST    PROCEDURE:


DAMP HEAT, STEADY STATE: CONTROL AND MONITORING UNITS INSTALLED IN INDUSTRY


1. SCOPE:           Equipment such as control and monitoring units installed in
                    laundries, chemical plants, food processing or similar loca-
                    tions in industry. This procedure for damp heat is especially
                    relevant to locations where exposure to high air humidity may
                    occur for extended periods at constant high temperatures.


2. OBJECT         To verify that no degradation takes place as a result of ad-
                   sorption or absorption of humidity, swelling of materials,
                   electrical resistivity changes, corrosion, etc. This procedure
                   allows time for diffusion of water to show its possible
                   effects.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    l        IEC 68-2-3, Test Ca, Damp heat, steady state.

                    Other    related   documents     are:

                    -       IEC 68-2-28, Guidance for damp heat tests.
                    -       IEC 721-3-4, Stationary use at non-weather-protected
                            locations.


4. TEST                                                                          ,
                    Climatic chamber capable of maintaining the specified humidity
   EQUIPMENT:       and temperature in working space within the tolerances given in
                    IEC 68.2.3.


5. PROCEDURE: 1)            After a functional test at standard ambient conditions,
                                                                                        I
                            the equipment is placed in the test chamber in its
                            unpacked, switch-off, ready-for-use state.

                    2)      After preconditioning, the specified exposure is com-
                            menced.

                    3)      Immediately before the end of exposure, the equipment is
                            switched on, a functional test is carried out and the
                            equipment is switched off.

                    4)      A final functional test is performed after recovery at
                            standard conditions for testing.




                                              - 55    -
                                               C302


6. SEVERITY:         Duration:    21 days




                                                    9 3 %RH



                                 I                  21days




7. ADDITIONAL    Before     testing   the   following    details   shall   be   specified:
   INFORMATION
   REQUIRED:     -        Functional tests before/during/after exposure.
                 -        Covers or lids to be open or closed if relevant.
                 l        Whether a time period is allowed between switch-on and
                          functional test.


8. REPORT:       A test report shall be prepared, containing at least:

                 -        Identification of equipment tested, test facilities used,
                          and date of test.
                 l        Description of physical set-up in chamber (photo).
                 -        Recording of temperature and humidity profile.
                 l        Results of functional checks and visual inspections.
                 -        Signatures of responsible test engineers.




                                             - 56    -
                                                                               NT ELEC C303
nordtest method                                                                Approved 1990-06




ENVIRONMENTAL     TEST        PROCEDURE:


DAMP   HEAT,    STEADY       STATE:   PROCESS   CONTROL    SYSTEM,   INDOORS


1. SCOPE:                This procedure is particularly applicable to large equipment
                         e.g. process control or equipment e.g. computers having complex
                         interconnections with other equipment. The equipment is sta-
                         tionary installed indoors and may be exposed to high humidity
                         at constant temperature without condensation during its use.


2. OBJECT                To demonstrate that adsorption or absorption of humidity does
     OF TEST:            not cause malfunctions or changes in function performances.
                         This test allows time for the diffusion of humidity to show its
                         possible effects on electrical resistance, swelling of mate-
                         rials, etc.


3.    RELATED            The test is performed according to:
     DOCUMENTS:
                         -       IEC 68-2-56, Test Cb, Damp heat, steady state, primarily
                                 for equipments.

                         Other    related   documents     are:

                         -       IEC 68-2-28, Guidance for damp heat tests.
                         l       IEC 721-3-3, Stationary use at weather-protected loca-
                                 tions.


4. TEST                  Climatic chamber capable of maintaining the specified humidity
   EQUIPMENT:            and temperature in working space within the tolerances given in
                         IEC 68-2-56.


5.     PROCEDURE:        1)      The chamber shall be at the conditions of temperature and
                                 humidity of the laboratory. After a functional test at the
                                 ambient conditions of the laboratory, the equipment shall
                                 be introduced into the chamber in its ready-for-use state,
                                 but switched off.

                         2)      The temperature in the chamber shall then be adjusted to
                                 the prescribed severity and time shall be allowed for the
                                 equipment to reach temperature stability.




                                                    - 57 -
                                                  C303


                 3)       The humidity shall then be slowly adjusted to the pre-
                          scribed severity and the eqipment shall be exposed to the
                          test conditions for a specified duration.

                 4)       If required, the equipment shall be switched on and ope-
                          rated during the conditioning period.

                 5)     At the end of this period, the equipment shall remain in
                        the chamber and the chamber conditions shall be slowly
                        adjusted to standard atmospheric conditions for testing.

                 6)     After the recovery time (1 h to 2 h) a visual examination
                        and an inspection of function shall be carried out.


6. SEVERITY:     Temperature:            30°C ± 2°C
                 Humidity :              85% RH ±3%
                 Duration :              4 days




                 23°C      /




                                                4d



7. ADDITIONAL    Before        testing   the   following   details   shall   be   specified:
   INFORMATION
   REQUIRED:     -      Functional tests before/during/after exposure.
                 -      Time schedule of functional tests and functional                  states
                        during the exposure.


8. REPORT:       A test report shall be prepared, containing at least:

                 -      Identification of equipment tested, test facilities used,
                        and date of test.
                 -      Description of physical set-up in chamber (photo).
                 -      Recording of temperature and humidity profile.
                 -      Results of functional checks and visual inspections.
                 -      Signatures of responsible test engineers.




                                                - 58 -
                                                                           NT ELEC C401
nordtest method                                                            Approved 1990-06




ENVIRONMENTAL    TEST    PROCEDURE:


DAMP HEAT, CYCLIC: EQUIPMENT INSTALLED OUTDOORS IN NORDIC COUNTRY - CLIMATES


1. SCOPE:           This procedure applies to electrical equipment installed in, or
                    built into, cabinets or cases which give no protection against
                    outdoor temperature variations. Examples of equipment are
                    petrol pumps, traffic controls, etc.


2. OBJECT           To demonstrate a capability of correct function during and
    OF TEST:        after exposure to high relative humidity including conden-
                    sation, and to detect bad choices of components and materials
                    with respect to corrosion and absorption of humidity. Attention
                    should be paid to the presence of water and deformed parts
                    which could result in loss of tightness or insulation.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    l     IEC 68-2-30, Test Db and guidance, Damp heat cyclic
                          (12 h + 12 h cycle)

                    Other    related   documents   are:

                    l     IEC 68-2-28, Guidance for damp heat tests.
                    l
                          IEC 721-3-4, Stationary use at non-weather-protected
                          locations.


4. TEST             Climatic chamber capable of maintaining the specified humidity
   EQUIPMENT:       and temperature in working space within the tolerances given in
                    IEC 68-2-30.


5. PROCEDURE:       1)       A functional test is performed after stabilization at
                            standard atmospheric conditions for testing.

                    2)      The specimen is placed in the humidity chamber and exposed
                            to the specified test profile in the switch-off state.

                    3)      Immediately before the end of upper temperature in the
                            last cycle, a functional check is performed. The equipment
                            is switched off again.

                    4)      After recovery for 1 h at laboratory temperature, a func-
                            tional test is performed.




                                              - 59 -
                                                 C401


                  5)       The humidity exposure of this procedure may be followed by
                           a cold test. In that case the last functional test is
                           reduced to a short check followed immediately by insertion
                           into the cold chamber.


6. SEVERITY:      Variant 1
                  Temperature      :  55°C
                  Humidity         :  93% RH
                  Number of cycles: 6




                                                                OFF
                                                                                 ,




                                                                   TEMPERATURE             (degC)




                                  0         4                     12           16            20        24

                                                            TIME (hours)




7. ADDITIONAL     Before    testing   the   following    details       shall         be   specified:
    INFORMATION
   REQUIRED:      -     Functional tests before/after exposure.
                  -    Insulation resistance and voltage tests.
                  -    Covers or lids to be open or closed if relevant.


8. REPORT:        A test report shall be prepared, containing at least:

                  -    Identification of equipment tested, test facilities used,
                       and date of test.
                  -    Description of physical set-up in chamber (photo).
                  -    Recording of temperature and humidity profile.
                  -    Results of functional checks and visual inspections.
                  -    Signatures of responsible test engineers.




                                                - 60 -
                                                                           NT ELEC C402
nordtest method                                                            Approved 1990-06




ENVIRONMENTAL    TEST    PROCEDURE:


DAMP HEAT, CYCLIC: CONTROL AND MONITORING UNITS INSTALLED IN INDUSTRY


1. SCOPE:           Equipment such as control and monitoring units installed in
                    laundries, chemical plants, food processing or similar loca-
                    tions in industry. Also applicable to equipment in compartments
                    without effective ventilation, i.e. in vehicles, cockpits, etc.
                    This procedure for damp heat is especially relevant for loca-
                    tions where humidity may be combined with significant tem-
                    perature  changes.


2. OBJECT           To verify that no degradation takes place as a result of water
    OF TEST:        condensation, due for instance to decreased electrical insula-
                    tion, obstructions to light in optics, adhesion of moving parts,
                    etc. Also to quantify possible breathing effects in connection
                    with hollow enclosures, and in general to examine the effects
                    of humidity on materials, such as swelling and corrosion.


3. RELATED          Test is performed according to:
    DOCUMENTS:
                    l       IEC 68-2-30, Test Db and guidance: Damp heat cyclic
                            (12 h + 12 h cycle). Variant 1.

                    Other    related   documents   are:

                    -       IEC 68-1, General and guidance
                    -       IEC 68-2-28, Guidance for damp heat tests.
                    -       IEC 721-3-4, Stationary use at non-weather-protected loca-
                            tions.


4. TEST             Climatic chamber capable of maintaining the specified humidity
   EQUIPMENT:       and temperature in working space within the tolerances given in
                    IEC 68-2-30.


5. PROCEDURE: 1)            After a functional test at standard atmospheric conditions
                            for testing, the equipment is placed in the test chamber
                            in its unpacked, switch-off, ready-for-use state.

                    2)       After preconditioning, the specified exposure is com-
                            menced.




                                              - 61 -
                                                    C402


                3)    Immediately before the end of the upper temperature in the
                      last cycle, the equipment is switched on, a functional
                      test is performed, and the equipment is switched off.

                4)   A final functional test is performed after recovery at
                     standard atmospheric conditions.


6. SEVERITY:    Upper  temperature: 55°C
                Number of cycles : 6




                                                                   OFF
                          70


                          60
                                                                                    dg)
                                                                     - TEMPERATURE ( e C
                          50
                                           /
                          40           /
                               .                                              \
                          30                                                      \
                                   /

                          20                   1      I
                               0               4            8        12               16   20   24

                                                                 IE
                                                                T M (hours)




7. ADDITIONAL   Before testing the following details shall be specified:
    INFORMATION
    REQUIRED:   -     Functional tests  before/during/after exposure.
                -    Covers or lids to be open or closed if relevant.
                -    Whether a time period is allowed between switch-on and
                     functional test.


8. REPORT:      A test report shall be prepared, containing at least:

                -    Identification of equipment tested, test facilities used,
                     and date of test.
                -    Description of physical set-up in chamber (photo).
                -    Recording of temperature and humidity profile.
                -    Results of functional checks and visual inspections.
                -    Signatures of responsible test engineers.




                                                   - 62 -
                                                                    NT ELEC C403
nordtest method                                                     Approved 1990-06




ENVIRONMENTAL   TEST    PROCEDURE:


DAMP HEAT, CYCLIC:      ELECTRICAL EQUIPMENT IN COUPE COMPARTMENT OF VEHICLES

1. SCOPE:          This procedure applies to electrical equipment installed in the
                   coupé compartment in motorcars. The equipment is protected from
                   water but may occasionally be subjected to condensation and
                   high humidity at low temperature. An example of application is
                   for taxameters.


2. OBJECT          To set minium requirements for correct function when exposed to
   OF TEST:        normal humidity fluctuations due to the daily temperature
                   variations. It is presumed that the performance is supervised
                   either automatically or by the operator.


3. RELATED         The test is performed according to:
   DOCUMENTS:
                   -       IEC 68-2-30, Test Db and guidance: Damp heat cyclic
                           (12 h + 12 h cycle).

                   Other    related   documents   are:

                   -       IEC 68-2-28, Background information.
                   -       IEC 721-3-5, Classification of enviromental   condition.
                           Ground vehicle installation.


4. TEST            Humidity chamber able to control temperature and humidity
   EQUIPMENT:      according to the test profile. Temperature and humidity plotter
                   with a measuring uncertainity of 0.5°C/2% RH.


5.   PROCEDURE:    1)      A functional test is performed before exposure in the
                           humidity chamber.

                   2)      The test object is placed in the humidity chamber and
                           exposed according to the test profile. The test object
                           should be in switch-off state during the entire test.

                   3)      After recovery for 1 h, a functional test is made.

                   4)       If the test is followed by a cold test, the functional
                           test is reduced to a short check in recovery atmosphere
                           and then placed in the cold chamber.




                                             - 63 -
                                                         C403


6. SEVERITY:     Temperature       55°C
                 Number of cycles: 2

                 The test profile is shown on the diagram.




                                                                              OFF
                                                               I                 I                       1
                             70


                             60
                                                                                 3 TEMPERATURE               (degC)
                             50
                                                /
                             40
                                        /
                                                                                       \
                             30
                                                                                           \
                                    /                                                          \
                             20             I              i       I
                                  0                  4             8            12                 16          20     24

                                                                          TIME ( h a m )




7. ADDITIONAL    Before   testing       the         following          details       shall          be   specified:
   INFORMATION
   REQUIRED:     -   Functional tests before/after exposure.
                 -   Insulation resistance and voltage tests.
                 -   Covers or lids to be open or closed if relevant.


8. REPORT:       A test report shall be prepared, containing at least:

                 -   Identification of equipment tested, test facilities
                     used and date of test.
                 -   Description of physical set-up in chamber (photo).
                 -   Recording of temperature and humidity profile.
                 -   Results of functional checks and visual inspections.
                 -   Signatures of responsible test engineers.




                                                     - 64 -
                                                                    NT ELEC C404
nordtest method                                                     Approved 1990-06




ENVIRONMENTAL   TEST    PROCEDURE:


DAMP HEAT, CYCLIC:      PORTABLE EQUIPMENT FOR INDOOR USE


1. SCOPE:          This procedure applies to portable equipment which are used
                   partially controlled indoor conditions and is transported be-
                   tween different locations in protective case. The equipment may
                   be stored at weather-protected locations, which do not have
                   temperature control.


2. OBJECT          To demonstrate a capability of correct function after exposure
   OF TEST:        to high relative humidity including condensation and to detect the
                   effects of the ingress and accumulation of water vapour by
                   breathing. Also to make sure that there are no remarkable
                   changes in insulation resistance of surface materials and no
                   leakage currents can occur.


3. RELATED         The test is performed according to:
   DOCUMENTS:
                   l       IEC 68-2-30, Test Db and guidance: Damp heat cyclic
                           (12 h + 12 h cycle).

                   Other    related   documents   are:

                   -       IEC 68-2-28, Guidance for damp heat tests.
                   -       IEC 721-3-7, Portable and non-stationary use.


4. TEST            Climatic chamber capable of maintaining the specified humidity
   EQUIPMENT:      and temperature in working space withing the tolerances given
                   in IEC 68-2-30.


5.   PROCEDURE:    1)      A functional test and if required an insulation resistance
                           measurements are performed after stabilization at standard
                           atmospheric conditions for testing.

                   2)      The speciment is placed in the humidity chamber and
                           exposed to the specified test profile in the switch-off
                           state.

                   3)      After recovery for 1 h at laboratory temperature, required
                           measurements and a functional test are performed.




                                             - 65 -
                                                 C404


6. SEVERITY:     Variant 1
                 Upper    temperature:  40°C
                 Humidity             : > 90% RH
                 Number of cycles : 6




                             90


                             80

                                                                   OFF
                                                                                       I    I
                             70


                             60


                             50


                             40


                             30


                             20
                                  0         4            6          12           16        20       24

                                                                TIME (hours)




7. ADDITIONAL    Before   testing     the   following        details     shall    be   specified:
   INFORMATION
   REQUIRED:     -    Functional tests before/after exposure.
                 -    Insulation resistance and voltage tests.
                 -    Covers or lids to be open or closed if relevant.
                 -    Visual   inspections.


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities used,
                      and date of test.
                 -    Description of physical set-up in chamber (photo).
                 -    Recording of temperature and humidity profile.
                 -    Results of functional checks and visual inspections.
                 -    Signatures of responsible test engineers.




                                                - 66 -
                                                                   NT ELEC C501
 nardtest method                                                   Approved 1990-06




ENVIRONMENTAL   TEST    PROCEDURE:


CHANGE OF TEMPERATURE: MECHATRONICS TRANSPORTED IN COLD CLIMATE


1. SCOPE:          This procedure is applicable to all kinds of equipment expected
                   to be transported or stored in a shipping package in a cold
                   climate. Rapid transitions between indoor and outdoor locations
                   may occur during initial shipment or later service and repair.
                   The extreme temperatures used in this procedure make it rele-
                   vant in the product development phase.


2. OBJECT          To demonstrate that the equipment can withstand the thermal
   OF TEST:        stresses induced. Alternatively, to pinpoint weak points in the
                   design, where differential thermal expansions will cause mecha-
                   nical or electrical malfunction.


3. RELATED         The test is performed according to:
   DOCUMENTS:
                   -      IEC 68-2-14, Test Nb, Change of temperature with specified
                          rate of change.

                  Other    related   documents   are:

                   -      IEC 68-2-33, Guidance on change of temperature tests
                   -      IEC 721-3-2, Transportation.


4. TEST            Temperature chamber capable of maintaining the specified tem-
   EQUIPMENT:     peratures and performing the temperature changes at the spe-
                   cified rate. Air velocity close to the specimen shall be
                   greater than 2 m/s.


5.   PROCEDURE:    1)     A functional test is performed after stabilization at
                          standard atmospheric conditions for testing.

                  2)      In a condition ready for use, but switched off, the speci-
                          men is introduced into the test chamber which is at room
                          temperature.

                  3)      At the specified rate, the chamber temperature is now
                          lowered to the required low temperature. After the time
                          required to reach temperature stability, the specimen is
                          exposed for an additional period of 3 h.




                                            - 67 -
                                             C501


                  4)   At the specified rate, the temperature is raised to the
                       required high temperature, which is kept for 3 h counted
                       after   stabilization as above.

                  5)   The temperature is        lowered at the specified rate. When
                       room temperature is       reached, one cycle of the exposure has
                       been performed. The       procedure is repeated to accomplish
                       the total number of       cycles specified.

                  6)   After the final cycle, and after stabilization at standard
                       ambient conditions, a functional test is performed.


6. SEVERITY:      Low temperature : -40°C
                  High temperature: +70°C
                  Rate of change :   l°C/min.
                  Number of cycles: 5




                  1                  OFF




7. ADDITIONAL     Before   testing   the   following   details   shall   be   specified:
    INFORMATION
   REQUIRED:      -     Functional tests before/after exposure.
                  -    Covers or lids to be open or closed if relevant.
                  -    Visual    inspections.


8. REPORT:        A test report shall be prepared, containing at least:

                  -    Identification of equipment tested, test facilities used,
                       and date of test.
                  -    Description of physical set-up in chamber (photo).
                  -    Results of functional checks and visual inspections.
                  -    Signatures of responsible test engineers.




                                            - 68 -
                                                                       NT ELEC C502
nordtest method                                                        Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


CHANGE OF TEMPERATURE: MAGNETIC MASS STORAGE DEVICE, INDOOR, VEHICLE


1. SCOPE:            This procedure is applicable to digital magnetic mass storage
                     devices, i.e. disk or tape sub-assemblies in microcomputers-or
                     workstations. These are supposed to be located indoors,
                     (buildings, ships, etc.), but on occasion the air masses may be
                     rapidly changed (ventilation etc.) causing significant tem-
                     perature   transients.

2. OBJECT            To demonstrate that reading and writing to the storage device
   OF TEST:          can take place without erroneous data. Errors may be caused for
                     instance by mechanical misalignments due to different thermal
                     expansion coefficients for the materials used.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     -       IEC 68-2-14, Test Nb, Change of temperature with specified
                             rate of change.

                     Other    related   documents     are:

                     -       IEC 68-2-33, Guidance on change of temperature tests.


4. TEST             Temperature chamber capable of maintaining the specified tem-
   EQUIPMENT:       peratures and performing the temperature changes at the spe-
                    cified rate. Air velocity close to the specimen shall be
                    greater than 2 m/s.

                    Computer/interface/controller/software and cables into the
                    chamber, for formatting, writing and reading the storage devi-
                    ces and for verification of the test data.

5.   PROCEDURE:      1)      Set-up mechanically and electrically of the storage device
                             in the test chamber at room temperature. It is important
                             to define and include relevant shields or covers belonging
                             to the device/sub-assembly.

                    2)       Format and write data. Start a continuous reading and
                             verification of the stored data during the following expo-
                             sure, interrupted only for writing of new data at each
                             extreme temperature. See figure overleaf.

                    3)       At the specified rate, the chamber temperature is now
                             lowered to the required low temperature. After the time




                                               - 69    -
                                                      C502


                          required to reach temperature stability, the storage
                          device is exposed for an additional period of 3 h, during
                          which new data are written.

                 4)       At the specified rate, the temperature is raised to the
                          required high temperature, which is kept for 3 h counted
                          after stabilization as above. Write new data during this
                          period.

                 5)        The temperature is lowered to the specified rate. When
                           room temperature is reached, one cycle of the exposure has
                           been performed. The procedure is repeated to accomplish
                           the total number of Cycles specified.

                 6)       After the final cycle, and after stabilization at standard
                          ambient conditions, a functional test is performed.


6. SEVERITY:     Low temperature : +5°C
                 High temperature: +40°C
                 Rate of change :   5°C/min.
                 Number of cycles: 5

                                           (F=fOrmat, W=write, R=read,    I=final     inspection)
                                                      R      W       R          W       R      I
                       Conditi-lF,y      R    ;:
                        oning 1 11            I I.           II                 II           I

                     TEMPERATURE      (°C)




7. ADDITIONAL    Before      testing         the   following   details   shall   be    specified:
   INFORMATION
   REQUIRED:     -        Functional tests before/after exposure.
                 -        Hardware and software for format/write/read.
                 -        Covers or lids to be included in the device/sub-assembly.
                 -        Storage media if exchangeable.


8. REPORT:       A test report shall be prepared, containing at least:

                 -        Identification of storage device tested, test software and
                          facilities used, and date of test.
                 -        Description of physical set-up in chamber (photo).
                 -        Results of functional checks and visual inspections.
                 -        Signatures of responsible test engineers.

                                                    - 70 -
                                                                            NT ELEC C503
nordtest method                                                             Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


CHANGE   OF   TEMPERATURE:     ELECTRONIC EQUIPMENT USED IN GROUND VEHICLES


1. SCOPE:            Electrical products installed in ground vehicles either per-
                     manently or temporarily. Vehicles include cars, motorcycles,
                     caravans, trains, tractors, fork lift trucks, harvesters, etc.
                     This application excludes conditions in engine compartment. An
                     example of the application is a mobile radio telephone (NMT).


2. OBJECT            To determine the ability of the specimen to withstand and func-
   OF TEST:          tion during gradual change of temperature. The temperature
                     shock and differential heating effects may cause mechanical
                     failure, cracking, sealing damage or leaks.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     -       IEC 68-2-14, Test Nb, Change of temperature with specified
                             rate of change.

                     Other    related   documents   are:

                     -       IEC 721-3-5, Ground vehicle instal lations. Class 5 K3.
                     -       IEC 68-2-33, Guidance on change of temperature tests.


4. TEST              The chamber for this test shall be capable of maintaining the
   EQUIPMENT:        required low and high temperatures and performing the tem-
                     perature change-over at the specified rate as specified
                     CLAUSE 6.

                      Air velocity measured close to the test specimen shall not be
                     less than 2 m/s.


5.   PROCEDURE:      1)      Initial measurements and visual examination sha 11 be
                             carried out.

                     2)      The specimen shall be introduced into the test chamber in
                             ready for use state, with the electrical connections
                             necessary for checking the operation.

                     3)      The specimen shall be brought into operating stand-by
                             condition.




                                               - 71 -
                                                  C503


                      4)   The temperature cycling between temperatures TA and TB
                           shall be started and carried out as described in IEC
                           68-2-14.

                      5)   The stand-by operation condition of the specimen shall be
                            monitored continuously.

                      6)   Other operational inspections or measurements, as full
                           power operation, transmission measurements etc. shall be
                           performed at both temperatures TA and TB immediately after
                           the temperature stability of the specimen has been
                           reached. These steps shall be repeated during two test
                           cycles.

                           After completing all five test cycles the specimen shall
                           remain in standard atmospheric recovery conditions for at
                           least 4 h.

                           The final measurements and visual examination shall be
                           carried out.


I
    6. SEVERITY:      Low temperature TA: -40°C
                      High temperature TB: +3O°C
                      Rate of change : 5°C/min.
                      Number of cycles : 5
                      Exposure time : 3 h
                      Recovery time : > 4h


    7. ADDITIONAL     Before   testing   the   following   details   shall   be   specified:
        INFORMATION
        REQUIRED:     -    Functional tests before/after exposure.
                      -    Covers or lids to be open or closed if relevant.
                      -    Visual   inspections.


    8. REPORT:        A test report shall be prepared, containing at least:

                      -    Identification of equipment tested, test facilities used,
                           and date of test.
                      -    Description of physical set-up in chamber (photo).
                      -    Results of functional checks and visual inspections.
                      -    Signatures of responsible test engineers.




                                                - 72 -
                                                                    NT ELEC C504
nordtest method ’                                                   Approved 1990-06




ENVIRONMENTAL   TEST    PROCEDURE:


CHANGE OF TEMPERATURE: PORTABLE EQUIPMENT, USE IN WEATHER-PROTECTED AND NON-
                         WEATHER-PROTECTED LOCATIONS

1. SCOPE:          This procedure is applicable to portable equipment which shall
                   be transferred between different environmental locations during
                   their use. Normally these products are switched off during
                   transferring from one location to another and they are also
                   unpacked.


2. OBJECT          To demonstrate that the equipment withstands the thermal
                   stresses. Alternatively, to determine weak points in the
                   design, where differential thermal expansions will cause mecha-
                   nical or electrical malfunctions.


3. RELATED         The test is performed according to:
   DOCUMENTS:
                   -       IEC 68-2-14, Test Na, Rapid change of temperature, with
                           prescribed time of transition.

                   Other    related   documents:

                   -       IEC 68-2-33, Guidance on change of temperature tests.
                   -       IEC 721-3-7, Portable and non-stationary use.


4. TEST           Two temperature chambers capable of maintaining the specified
   EQUIPMENT:     temperatures and after insertion of the equipment, the tempe-
                  rature of the atmosphere shall be within the specified
                  tolerance less than 18 min. Air velocity close to the specimen
                  shall be greater than 2 m/s.


5.   PROCEDURE:    1)      An inspection of function shall be carried out before the
                           exposure.

                  2)       In a condition ready for use, but switched off, the equip-
                           ment shall be placed in the cold chamber, which is at the
                           specified low temperature. The exposure time is specified.

                  3)       After that period the equipment shall be removed from the
                           cold chamber and transferred to the hot chamber during 2-3
                           min.




                                            - 73 -
                                                       C504


                 4)         The exposure time in the hot chamber is the same as in the
                            cold chamber.

                 5)         For the next cycle the equipment shall be transferred to
                            the cold chamber during 2-3 min.

                 6)        The equipment shall be subjected to five cycles and after
                           the final cycle and after stabilization at standard
                           ambient conditions, a functional test and visual examina-
                           tion is performed.


6. SEVERITY:     Low temperature : -40°C
                 High temperature: +30°C
                 Transition time : 2-3 min.
                 Number of cycles: 5

                     Temperature in the chamber




                                                                                                      Time t


                                             \                  2-3 min                \
                                             \                                             \
                       40°C -M---d* \                                                          \

                                            - ( 18 min
                                            I,1                      1 cycle


7. ADDITIONAL    Before       testing     the     following      details       shall   be          specified:
   INFORMATION
   REQUIRED:     -         Functional tests before/after                   exposure.
                 -         Visual   inspections.


8. REPORT:       A test report shall be prepared, containing at least:

                 -         Identification of equipment tested, test facilities used,
                           and date of test.
                 -         Results of functional checks and visual inspections.
                 -         Signatures of responsible test engineers.




                                                   -   74   -
                                          NT ELEC
nordtest method                           Approved 1990-06




     5.2 Mechanical Procedures




                                 - 75 -
                                                                      NT ELEC Ml01
nordtest method                                                       Approved 1990-06




ENVIRONMENTAL     TEST     PROCEDURE:


VIBRATION SINE:          ELECTRONIC EQUIPMENT INSTALLED IN RAILWAY CARRIAGES


1. SCOPE:            Electronic equipment for fixed installation in railway car-
                     riages in general. Examples are equipment for internal com-
                     munication, air-conditioning, display etc. The procedure is not
                     intended for installation in engine compartments of traction
                     vehicles or on boogies etc.

                     The vibration requirements of several national railway authori-
                     ties as well as IEC 571 should be covered.


2. OBJECT            To demonstrate that mechanical vibration does not impair the
   OF TEST:          functioning due to mechanical resonances in circuit boards,
                     cabling, heavy components etc. Secondly, to ascertain that
                     accumulating effects, such as fatigue and wear do not decrease
                     performance.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     l       IEC 68-2-6, Test Fc, Vibration (Sinusoidal).

                     Other    related   documents   are:

                     -       IEC 68-2-47, Mounting of components, equipments and
                             other articles for dynamic tests.
                     -       IEC 571, Rules and regulations for electronic equipments
                             used on rail vehicles.


4. TEST              Vibrator with fixture large enough to fulfil IEC requirements
   EQUIPMENT:        on transmissibility, transverse motion of fixture, distortion
                     etc. in a frequency range up to 200 Hz.


5.   PROCEDURE:      1)      The equipment is mounted on vibrator using its normal
                             means of mounting. Any special brackets etc. shall be
                             included. It is important also, that external cables and
                             connections are included and fastened to simulate con-
                             ditions during normal use.

                     2)      The equipment is switched on and functionally monitored
                             during all exposures.




                                                - 77 -
                                                  M101


                  3)   A response investigation is carried out to determine fre-
                       quencies of critical vibration response or influence on
                       electrical function.

                  4)   Endurance for the specified time at each critical fre-
                       quency in turn.

                  5)   Endurance by sweeping for the time needed to reach the
                       total specified endurance time (steps 4) + 5)).

                  6)   Steps 1) to 5) are repeated in both remaining perpen-
                       dicular axes of the equipment.

                       Alternatively, if practical, it is allowed to complete -
                       response investigation in all three axes before commencing
                       endurance exposures.


6. SEVERITY:      In each axis the following exposures are carried out with
                  the same amplitude:

                  Response investigation
                  Endurance   at    critical      frequencies   (if    any):
                  Duration per frequency:   15 min.
                  Maximum of 4 frequencies per axis.

                  Endurance    by    sweeping:
                                             .:      1 octave/min.
                  Sweep rate
                  Duration                   :       The time required to reach the total
                                                    endurance time
                  Total endurance       time:       2 h/axis
                  Amplitude                  :       1-10 Hz : 2.5 mm
                                                    10-100 Hz: 1 g


7. ADDITIONAL     Before   testing    the   following     details     shall    be   specified:
    INFORMATION
   REQUIRED:      -    If it is necessary to produce a special vibration fixture
                       to simulate mounting conditions in use.
                  -    Functional checks and modes before/during/after the expo-
                       sures.
                  -    If any parts of the equipment shall be subjected to spe-
                       cial visual examination after the exposures.


8. REPORT:        A test report shall be prepared, containing at least:

                  -    Identification of equipment tested, test facilities used,
                       and date of test.
                  -    Description of mounting on vibrator (photo).
                  -    Recording of critical frequencies/responses.
                  -    Results of functional checks and visual inspections.
                  -    Signatures of responsible test engineers.


                                                 - 78 -
                                                                                    NT ELEC Ml02
nordtest method                                                                     Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


VIBRATION SINE: ELECTRONIC EQUIPMENT INSTALLED NEAR ROTATING MACHINERY


1. SCOPE:            Equipment such as control and monitoring units for fixed
                     mounting near to rotating machinery, where vibration will be
                     mainly at a single frequency. Alternatively mounting could be
                     to a structure with a single, dominant mode of vibration.
                     Equipment is of medium size, weighing typically about 5 kg, and
                     has its own mounting flanges. This procedure does not include
                     minor units like transducers attached directly to bearings or
                     moving parts where levels could be very high, depending on the
                     machine.


2. OBJECT            To demonstrate that mechanical vibration does not impair the
   OF TEST:          functioning in the short term due to mechanical resonances in
                     circuit boards, cabling, heavy components etc. Failures could
                     be associated with misalignments, loose contacts or microphony.
                     Secondly, it is the aim to ascertain that accumulating effects,
                     such as fatigue and wear in materials or loosening of screws,
                     do not decrease performance in the long run. Vibration response
                     investigation is not included in this test procedure.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     -       IEC   68-2-6,   Test   Fc,       Vibration   (Sinusoidal).

                     Other    related   documents   are:

                     -       IEC 68-2-47, Mounting of components, equipments, and other
                             articles for dynamic tests.
                     -       IEC 721-3, Classification of groups of environmental para-
                             meters and their severities.


4. TEST              Vibrator with fixture large enough to fulfil IEC requirements
   EQUIPMENT:        requirements on transmissibility, transverse motion of fixture,
                     distortion etc. in a frequency range exceeding 500 Hz.


5.   PROCEDURE:      1)      The equipment is mounted on vibrator using its normal
                             means of mounting, i.e. flanges and screws. Any special
                             brackets etc. shall be included. It is important also,
                             that external cables and connections are included and
                             fastened to simulate conditions during use. If a special
                             mechanical interface for mounting is required, a corre-
                             sponding fixture must be produced.



                                                - 79      -
                                                    Ml02


                 2)   A   functional        check     is    performed    before      exposures.

                 3)   With the equipment in the switched on condition, the
                      specified number of sweep cycles are applied at the spe-
                      cified level.

                 4)   During the last sweep cycles, a functional check is
                      carried out.

                 5)   Steps l), 3), and 4) are repeated for each of the two
                      remaining perpendicular axes of the equipment.

                 6)   A   functional        check     is   performed    after     exposures.


6. SEVERITY:     Endurance   by     sweeping
                 Sweep rate               :                 1 octave/min.
                 Number of sweep cycles :                  20 per axis
                 (Corresponding duration:                  3 h 45 min./axis)
                 Amplitude                :                 10-59.6 Hz : 0.35 mm
                                                           59.6-500 Hz: 5 g




                                     0,35     :
                                     mm       :
                                      J:
                                      .  .                                        'log

                                     10      59,6     Hz      FREQUENCY 500 H z




7. ADDITIONAL    Before   testing    the     following       details    shall   be    specified:
   INFORMATION
   REQUIRED:     -    If it is necessary to produce a special vibration fixture
                      to simulate mounting conditions in use.
                 -    Functional checks during/after exposures.
                 -    If any parts of the equipment shall be subjected to a spe-
                      cial visual examination after exposures.


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities used,
                      and date of test.
                 -    Description of mounting on vibrator (photo).
                 -    Results of functional checks and visual inspections.
                 -    Signatures of responsible test engineers.




                                                  - 80 -
                                                                                 NT ELEC Ml03
nordtest method                                                                  Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


VIBRATION SINE: TRANSDUCER UNITS INSTALLED ON ROTATING MACHINERY


1. SCOPE:            This procedure is applicable to smaller units such as trans-
                     ducers for fixed mounting on rotating machinery, where vibra-
                     tion will be mainly at a single frequency. The units, weighing
                     typically less than 0.5 kg, have their own mounting flanges.


2. OBJECT            To demonstrate that mechanical vibration do not impair the
   OF TEST:          functioning in the short term due to mechanical resonances.
                     Failures could be associated with misalignments, loose contacts
                     or microphony. Secondly, it is the aim to ascertain that
                     accumulating  effects, such as material fatigue/wear or misalign
                     ments do not cause drift of sensitivity, offset etc.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     -       IEC   68-2-6,   Test   Fc,     Vibration   (sinusoidal).

                     Other    related   documents    are:

                     -       IEC 68-2-47, Mounting of components, equipments, and other
                             articles for dynamic tests.
                     -       IEC 721-3, Classification of groups of environmental para-
                             meters and their severities.


4. TEST              Vibrator with fixture large enough to fulfil IEC requirements
   EQUIPMENT:        on transmissibility, transverse motion of fixture, distortion
                     etc. in a frequency range exceeding 2000 Hz.


5.   PROCEDURE:      1)      The test specimen is mounted on vibrator using its normal
                             means of mounting, i.e. flanges and screws. Any special
                             brackets etc. shall be included. It is important that
                             cables and connections are included and fastened to simu-
                             late conditions during use. If a special mechanical inter-
                             face for mounting is required, a corresponding fixture
                             must be produced.

                     2)      A functional check is performed before exposures.




                                                - 81 -
                                               Ml03


                     With the equipment in the switched on condition, the spe-
                     cified number of sweep cycles are applied at the specified
                     level.

                     During the last sweep cycles, a functional check is
                     carried out.

                     Steps l), 3) and 4) are repeated for each of the two re-
                     maining perpendicular axes of the equipment.

                     A   functional       check   is    performed   after   exposures.


6. SEVERITY:    Endurance   by     sweeping:

                Amplitude               :              100-2000 Hz: 10 g
                Sweep rate                             1 octave per min.
                Number of sweep cycles:               20/axis
                Corresponding duration:               2h 53m in./axis


7. ADDITIONAL   Before   testing    the    following      detai ls shall be specified:
  INFORMATION
   REQUIRED:    -    If it is necessary to produce a special vibration fixture
                     to simulate mounting conditions in use.
                -    Functional checks during/after exposures. When checking
                     sensors, it is important to state the required resolution
                     in time and frequency of the monitoring equipment.


8. REPORT:      A test report shall be prepared, containing at least:

                -    Identification of equipment tested, test facilities used,
                     and date of test.
                -    Description of mounting on vibrator (photo).
                -    Results of functional checks and visual inspections.
                -    Signatures of responsible test engineers.




                                             - 82 -
                                                                             NT ELEC Ml04
nordtest method ’                                                            Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


VIBRATION   SINE:    INSTRUMENTATION     AND   AUTOMATION   EQUIPMENT   INSTALLED   ON   SHIPS


1. SCOPE:            Instrumentation and automation equipment installed on bulk-
                     heads, beams, deck, bridge on board ships.


2. OBJECT            To demonstrate capability of correct function in environments
   OF TEST:          normally to be expected on board ships.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     -       Det norske Veritas, Certification Notes No. 2.4, Type
                             Approval of Instrumentation and Automation Equipment;
                             D.7.2 Sweep sine test, Class A.
                             Tolerances on velocity or acceleration are ±10%.

                     Other    related   documents   are:

                     -       IEC 68-1, General and guidance.
                     -       IEC 68-2-6, Test Fc, Vibration (sinusoidal).
                     -       IEC 68-2-47, Mounting of components, equipments, and other
                             articles for dynamic tests.
                     -       IEC 721-3-2, Classification of groups of environmental
                             parameters and their severities. Transportation, Class 2M2.


4. TEST              Vibrator with fixture capable of vibrating in both vertical and
   EQUIPMENT:        horizontal axes, and large enough to meet the IEC requirements
                     on transmissibility, transvers motion of fixture, distortion
                     etc. in a frequency range exceeding 200 Hz.


5.   PROCEDURE:      1)      A functional test at normal ambient conditions is carried
                             out prior to the exposure.

                     2)      The equipment is mounted on a vibrator using its normal
                             points of attachment. The equipment shall be in its nor-
                             mal, upright position during exposure in all three axes.

                     3)      The equipment is switched on and functionally monitored
                             during all exposures.




                                               - 83 -
                                              M104


                 4)   A resonance search is carried out to determine frequencies
                      of critical vibration response or influence on electrical
                      function.

                 5)       Endurance for the specified time at each critical fre-
                          quency in turn.

                 6)   Steps 1) to 5) are repeated in both remaining perpen-
                      dicular axes of the equipment.


6. SEVERITY:     In each axis the following exposures are carried out with the             -
                 same amplitude.

                 Resonance    search
                 Endurance at all actual frequencies where the amplification
                 factor is greater than 5. If no amplification factor higher
                 than 5 is found, the endurance test is to be performed at the
                 frequency of the highest one. If no resonance frequencies are
                 found, the test is to be carried out at 30 Hz.

                 Amplitude:           3- 22 Hz:    50 mm/s
                                     22-100 Hz:    0.7 g
                 Duration :          2 h/frequency

                 The levels are referred to the control point which is the vi-
                 bration table unless otherwise specified in the relevant test
                 programme.


7. ADDITIONAL    Before    testing   the   following   details   shall   be   specified:
   INFORMATION
   REQUIRED:     -    If it is necessary to produce a special fixture to
                      simulate mounting in normal use.
                 -    The three directions of exposures, if choice is critical.
                 -    Functional  tests  before/during/after exposure.
                 -    If any parts of the equipment shall be subjected to a spe-
                      cial visual examination after the exposure.


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities used,
                      and date of test.
                 -    Description of mounting on vibrator machine for the three
                      chosen exposure directions (photo, drawing, etc.).
                 -    Recording of functional tests and visual inspections.
                 -    Signatures of responsible test engineers.




                                            - 84 -
                                                                    NT ELEC M201
nordtest method                                                     Approved 1990-06




ENVIRONMENTAL   TEST   PROCEDURE:


VIBRATION RANDOM: ELECTRONIC SECURITY CENTRAL UNITS INSTALLED IN BUILDINGS


1. SCOPE:          Electronic equipment such as fire and burglar alarm central
                   units installed in receptions, halls etc. The test can be con-
                   sidered a basic ruggedness test for electronic units where the
                   influence of weak vibrations cannot be ruled out in some
                   installations. For transducers and other small units a more
                   severe test should be considered.


2. OBJECT          To demonstrate that mechanical vibration does not cause false
   OF TEST:        alarms or other malfunctions. Also to verify that there are no
                   harmful resonances in circuit boards, cabling, transformers,
                   batteries etc.


3. RELATED         The test is performed according to:
   DOCUMENTS:
                   -        IEC 68-2-36, Test Fdb, (1973), Random Vibration, Wide
                           Band, Reproducibility Medium. Confirmation of the ASD
                           level shall be with a frequency resolution of less than
                           2 Hz. Tolerances on ASD are narrowed to +3 dB.

                   Other    related   documents   are:

                   -       IEC 68-2-47, Mounting of components, equipments, and other
                           articles for dynamic tests.
                   -       IEC 721-3-3, Stationary use at weather-protected locations.


4. TEST            Vibrator with fixture capable of vibration in both vertical and
   EQUIPMENT:      horizontal axes, and large enough to meet IEC requirements on
                   transmissibility, transverse motion of fixture, distortion etc.
                   in a frequency range up to 200 Hz.


5. PROCEDURE: 1)           The equipment is mounted on vibrator using its normal
                           means of mounting. Any special brackets etc. shall be
                            included. It is important also, that external cables and
                            connections are included and fastened to simulate con-
                           ditions during normal use. The equipment shall be in its
                           normal upright position during vibration in all three
                           axes.




                                             - 85 -
                                            M201


                 2)      A functional check is performed before the exposures.

                 3)      The equipment is switched on and monitored during the
                         entire exposure.

                 4)      Steps l), 2), and 3) are repeated in both remaining per-
                         pendicular axes of the equipment.

                 5)      A functional check is performed after the exposures.


6. SEVERITY:     ASD 10-20 Hz           :   0.0005 g2/Hz
                 ASD 20-150 Hz            -3 dB/octave
                 Total rms acceleration:
                 Duration/axis          :


                                 LOG
                      ACCELE-
                      RATION           I
                      SPECTRAL
                      DENSITY                                 /octave




                                                                            LOG

                                                                        I    --

                                    lb Hz     20 Hz   FREQUENCY     150 Hz




7. ADDITIONAL    Before testing the following details shall be specified:
   INFORMATION
   REQUIRED:      -       If it is necessary to produce a special vibration
                         fixture to simulate mounting conditions in use.
                 -       Functional checks and modes before/during/after the expo-
                         sures.
                 -       If any parts of the equipment shall be subjected to spe-
                         cial visual examination after the exposures.


8. REPORT:       A test report shall be prepared, containing at least:
                 -       Identification of equipment tested, test facilities used,
                         and date of test.
                 -       Description of mounting on vibrator (photo).
                 -       Recording of ASD level in reference point.
                 -        Results of functional checks and visual inspections.
                 -        Signatures of responsible test engineers.




                                            - 86 -
                                                                                  NT ELEC M202
nordtest method                                                                   Approved 1990-06




ENVIRONMENTAL   TEST        PROCEDURE:


VIBRATION   RANDOM:        ELECTRONIC     EQUIPMENT    INSTALLED   IN   RAILWAY   CARRIAGES


1. SCOPE:             Electronic equipment for fixed installation in railway car-
                      riages in general. Examples are equipment for internal com-
                      munication or air-conditioning. The procedure is not intended
                      for installation in engine compartments of traction vehicles or
                      on boogies etc. Random vibration up to 150 Hz is used to cover
                      the sine vibration requirements of several national railway
                      authorities as well as IEC 571.


2. OBJECT             To demonstrate that mechanical vibration does not impair the
   OF TEST:           functioning due to mechanical resonances in circuit boards,
                      cabling, heavy components etc. Secondly, to ascertain that
                      accumulating effects, such as fatigue and wear, do not decrease
                      performance.

                      Vibration response investigation is not included, but it is
                      assumed that there are no resonances below 10 Hz.


3. RELATED            The test is performed according to:
   DOCUMENTS:
                      -       IEC 68-2-36, Test Fdb, (1973), Random Vibration, Wide
                              Band, Reproducibility Medium. Confirmation of the ASD
                              level shall be with a frequency resolution of less than
                              2 Hz. Tolerances on ASD are narrowed to ±3 dB.

                      Other     related    documents     are:

                      -       IEC 68-2-47, Mounting of components, equipments and other
                              articles for dynamic tests.
                      -       IEC 571, Rules and regulations for electronic equipment
                              used on rail vehicles.


4. TEST               Vibrator with fixture large enough to fulfil IEC requirements
   EQUIPMENT:         on transmissibility, transverse motion of fixture, distortion
                      etc. in a frequency range up to 200 Hz.


5.   PROCEDURE:       1)      The equipment is mounted on vibrator using its normal
                              means of mounting. Any special brackets etc. shall be
                              included. It is important also, that external cables and
                              connections are included and fastened to simulate con-
                              ditions during normal use.




                                                      - 87 -
                                                 M201


                 2)       A functional check is performed before the exposures.

                 3)      The equipment is switched on, the level is increased to the specified
                         level, which is then applied for the specified duration.

                 4)      Steps l), 2), and 3) are repeated in both remaining per-
                         pendicular axes of the equipment.

                 5)      A functional check is performed after the exposures.

                                               2
6. SEVERITY:     ASD 10-20 Hz          : 0.01 g /Hz
                 ASD 20-150 Hz             -3 dB/octave
                 Total rms acceleration: 0,7 grms
                 Duration/axis          :    2h



                                     LOG

                      ACCELE-
                      RATION
                      SPECTRAL
                      DENSITY                                        -3dB/octave




                                           I        I                              I    LOG

                                                                                   I

                                       l0 Hz       20 Hz      FREQUENCY           150   Hz




7. ADDITIONAL    Before    testing    the      following   details   shall   be   specified:
   INFORMATION
   REQUIRED:     -       If it is necessary to produce a special vibration
                         fixture to simulate mounting conditions in use.
                 -       Functional checks and modes before/during/after the expo-
                         sures.
                 -       If any parts of the equipment shall be subjected to spe-
                         cial visual examination after the exposures.


8. REPORT:       A test report shall be prepared, containing at least:

                 -       Identification of equipment tested, test facilities used,
                         and date of test.
                 -       Description of mounting on vibrator (photo).
                 -       Recording of ASD level in reference point.
                 -       Results of functional checks and visual inspections.
                 -       Signatures of responsible test engineers.




                                                - 86 -
                                                                      NT ELEC M203
                                                                      Approved 1990-06
nordtest method .


ENVIRONMENTAL     TEST    PROCEDURE:


VIBRATION RANDOM: INSTRUMENTATION AND AUTOMATION EQUIPMENT INSTALLED ON SHIPS

1. SCOPE:            Instrumentation and automation equipment installed   on   bulk-
                     heads, beams, deck, bridge on board ships.


2. OBJECT            To demonstrate capability of correct function in environments
   OF TEST:          normally to be expected on board ships.

                     Resonance search is not included in this test procedure.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     -       Det norske Veritas, Certification Notes No. 2.4, Type
                             Approval of Instrumentation and Automation Equipment;
                             D.7.4 Wide band random test, Class A.
                             Tolerances on PSD are ±4 dB.

                     Other    related   documents   are:

                     l       IEC 68-1, General and guidance.
                     l       IEC 68-2-36, Test Fdb, Random vibration wide band, repro-
                             ducibility  medium.
                     l       IEC 68-2-47, Mounting of components, equipments, and other
                             articles for dynamic tests.
                     l       IEC 721-3-2, Classification of groups of environmental
                             parameters and their severities. Transportation, Class 2M2.


4. TEST              Vibrator with fixture capable of vibrating in both vertical and
   EQUIPMENT:        horizontal axes, and large enough to meet the IEC requirements
                     on transmissibility, transvers motion of fixture, distortion
                     etc. in a frequency range exceeding 400 Hz.


5.   PROCEDURE:      1)      A functional test at normal ambient conditions is carried
                             out prior to the exposure.

                     2)      The equipment is mounted on a vibrator using its normal
                             points of attachment. The equipment shall be in its nor-
                             mal, upright position during exposure in all three axes.




                                               - 89   -
                                                           M203


                 3)         The power is on during the entire exposure.

                 4)         Step l), 2), and 3) are repeated for each of the two
                            remaining perpendicular axes of the equipment.

                 5)         A final functional test is performed after completion of
                            the vibration.


6. SEVERITY:     Total rms acceleration: 0.7 grms
                 FL = 3 Hz
                 Fu = 100 Hz
                 Duration/axis:   30 min.

                 The levels are referred to the control point which is the
                 vibration table unless otherwise specified in the relevant test
                 programme.

                      POWER   SPECIAL   DENSITY




                        .      I   .
                      1/4 FL ½F L F L                                FU   2F U   4F U




7. ADDITIONAL    Before       testing             the   following   details      shall   be   specified:
   INFORMATION
   REQUIRED:     -       If it is necessary to produce a special fixture to simu-
                        late mounting in normal use.
                 -      The three directions of exposures, if choice is critical.
                 -      Functional  tests  before/during/after exposure.
                 -      If any parts of the equipment shall be subjected to a spe-
                        cial visual examination after the exposure.


8. REPORT:       A test report shall be prepared, containing at least:                                     .

                 -      Identification of equipment tested, test facilities used
                        and date of test.
                 -      Description of mounting on vibrator machine for the three
                        chosen exposure directions (photo, drawing, etc.).
                 -      Recording of vibration response in the reference point.
                 -      Results of functional tests and visual inspections.
                 -      Signatures of responsible test engineers.




                                                         - 90 -
                                                                     NT ELEC M204
nordtest method                                                      Approved 1990-06




ENVIRONMENTAL    TEST   PROCEDURE:


VIBRATION RANDOM: ELECTRONIC UNITS FOR INSTALLATION ON PRODUCTION MACHINERY


1. SCOPE:           Equipment such as control and monitoring units for general
                    industrial use. Equipment is of medium size, weighing typically
                    about 5 kg and has its own mounting flanges. It could be
                    mounted anywhere on girders and framework of machinery for pro-
                    duction or mechanical handling. No special precautions are
                    prescribed for its mounting, except that it should not be
                    mounted directly on rotating or moving parts.


2. OBJECT           To demonstrate that mechanical vibration does not impair the
    OF TEST:        functioning in the short term due to mechanical resonances in
                    circuit boards, cabling, heavy components etc. Failures could
                    be associated with misalignments, loose contacts or microphony.
                    Secondly, it is the aim to ascertain that accumulating effects,
                    such as fatigue and wear in materials or loosening of screws,
                    do not decrease performance in the long run. Vibration response
                    investigation is not included in this test procedure.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    -       IEC 68-2-36, Test Fdb, (1973), Random Vibration, Wide
                            Band, Reproducibility Medium. Confirmation of vibration
                            levels shall be with frequency analysis of 2-5 Hz resolu-
                            tion. Tolerances on ASD are narrowed to ±3 dB

                    Other    related   documents   are:

                    -       IEC 68-2-47, Mounting of components, equipments, and   other
                            articles for dynamic tests.
                    -       IEC 721-3, Classification of groups of environmental   para-
                            meters and their severities.


4. TEST             Vibrator with fixture large enough to fulfil IEC requirements
   EQUIPMENT:       on transmissibility, transverse motion of fixture, distortion
                    etc. in a frequency range exceeding 500 Hz.


5. PROCEDURE: 1 )            The equipment is mounted on vibrator using its normal
                            means of mounting, i.e. flanges and screws. Any special
                            brackets etc. shall be included. It is important also,
                            that external cables and connections are included and
                            fastened to simulate conditions during use. If a special
                            mechanical interface for mounting is required, a cor-
                            responding fixture must be produced.


                                              - 91 -
                                                  M204


                 2)      A functional check is performed before exposures.

                 3)      With the equipment switched on, the level is increased to
                         the specified level, which is applied for the specified
                         duration.

                 4)      During the last minutes of exposure, a functional check is
                         carried out.

                 5)      Steps l), 3), and 4) are repeated for each of the two
                         remaining perpendicular axes of the equipment.

                 6)      A   functional       check   is    performed    after    exposures.


                                        ..                 0.05 g2/Hz
6. SEVERITY:     ASD 10-20 Hz
                 ASD 20-500 Hz           :                 -3 dB/octave
                 Total rms acceleration:                   l.9 grms
                 Duration/axis           :                 90 min.



                      ACCELE-
                      RATION
                                 I
                                          I
                      SPECTRAL            I            I
                      DENSITY             I            I                 -3d   B/octave
                                          I            I
                                          I            I
                                          I
                                          I            I                                  1   LOG

                                 I       I             I                                  I   .
                                         I             I                                  I
                                        10 Hz         2 0 HZ      FREQUENCY            5 0 0 HZ




7. ADDITIONAL    Before      testing   the     following       details   shall    be   specified:
   INFORMATION
   REQUIRED:     -       If it is necessary to produce a special vibration fixture
                         to simulate mounting conditions in use.
                 -       Functional checks during/after exposures.
                 -       If any parts of the equipment shall be subjected to a spe-
                         cial visual examination after exposures.


8. REPORT:       A test report shall be prepared, containing at least:

                 -       Identification of equipment tested, test facilities used,
                         and date of test.
                 -       Description of mounting on vibrator (photo).
                 -       Recording of ASD level in reference point.
                 -       Results of functional checks and visual inspections.
                 -       Signatures of responsible test engineers.




                                                 - 92 -
                                                                      NT ELEC M205
 nordtest method                                                      Approved 1990-06




ENVIRONMENTAL     TEST   PROCEDURE:


VIBRATION      RANDOM:       ELECTRONIC EQUIPMENT FOR DESKTOP USE


1.    SCOPE:         Electrical equipment for free standing, desktop use in offices,
                     homes and laboratories. Equipment is occasionally switched off
                     and moved for use in different locations. Equipment is typi-
                     cally transported on an instrument trolley. During operation
                     vibrations may occur as a result of traffic or machinery in the
                     vicinity.


2. OBJECT            To demonstrate that mechanical vibration does not impair the
   OF TEST:          functioning in the short term due to mechanical resonances in
                     circuit boards, cabling, heavy components etc. Failures could
                     be associated with misalignments, loose contacts or microphony.
                     Secondly, it is the aim to ascertain that accumulating effects,
                     such as fatigue and wear in materials or loosening of screws,
                     do not decrease performance in the long run. Vibration response
                     investigation is not included in this test procedure.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     -       IEC 68-2-36, Test Fdb, (1973), Random Vibration, Wide
                             Band, Reproducibility Medium. Confirmation of vibration
                             levels shall be with frequency analysis of 2-5 Hz resolu-
                             tion. Tolerances on ASD are narrowed to ±3 dB.

                     Other    related   documents   are:

                     -       IEC 68-2-47, Mounting of components, equipments, and other
                             articles for dynamic tests.
                     -       IEC 721-3, Classification of groups of environmental para-
                             meters and their severities.


4. TEST             Vibrator with fixture capable of vibrating in both vertical and
   EQUIPMENT:       horisontal axes, and large enough to fulfil IEC requirements on
                    transmissibility, transverse motion of fixture, distortion etc.
                    in a frequency range exceeding 150 Hz.


5.   PROCEDURE:     1)       The equipment is mounted on a vibrator using stays to hold
                             it firmly against the fixture. Any rubber feet are by-
                             passed by rigid blocks positioned adjacent to each foot.
                             If feets are specifically designed to provide vibration
                             isolation, the equipment shall, however, be free standing
                             during functional checks. Equipment shall be in its nor-
                             mal, upright position during exposure in all three axes.


                                               - 93 -
                                                  M205


                 2)      A   functional       check        is   performed   before    exposure.

                 3)      Exposure is commenced. When, during equalization, the
                         level reaches -6 dB from specified level, a functional
                         check is carried out.

                 4)      The equipment is switched off, and the level is increased
                         to the specified level, which is applied for the specified
                         duration.

                 5)      Steps l), 3), and 4) are repeated for each of the two
                         remaining perpendicular axes of the equipment.

                 6)      A   functional       check        is   performed   after    exposures.


6. SEVERITY:     ASD 10-20 Hz           :                    0.01 g2/Hz
                 ASD 20-150 Hz                              -3 dB/octave
                 Total rms acceleration:                    0.7 grms
                 Duration/axis          :                    90 min.



                      ACCELE-
                      RATION
                      SPECTRAL
                      DENSITY                                                dB/octave




                                          I            I                                    1   LOG

                                                                                            1        C
                                          1

                                        1 0 HZ        20 Hz         FREQUENCY             1 5 0 HZ




7. ADDITIONAL    Before      testing   the     following         details    shall    be   specified:
   INFORMATION
   REQUIRED:     -       If standing-feets are specifically designed to provide     -
                         vibration isolation in use.
                 -       Functional checks during/after exposures.
                 -       If any parts of the equipment shall be subjected to a spe-
                         cial visual examination after exposures.


8. REPORT:       A test report shall be prepared, containing at least:

                 -       Identification of equipment tested, test facilities used,
                         and date of test.
                 -       Description of mounting on vibrator (photo).
                 -       Recording of ASD level in reference point.
                 -       Results of functional checks and visual inspections.
                 -       Signatures of responsible test engineers.



                                                 - 94 -
                                                                    NT ELEC M206
nordtest method                                                     Approved 1990-06




ENVIRONMENTAL    TEST   PROCEDURE:


VIBRATION RANDOM: EQUIPMENT IN PACKAGE FOR PUBLIC SHIPMENT

1. SCOPE:           This procedure applies to electronic or other equipment in
                    shipping package, when the package and cushioning already has
                    been produced. Shipment is by public post authorities. The
                    complete package would weigh typically less than 80 kg. The
                    vibration severity is based on the assumption that in the end
                    the package will be transported on the cargo platform of a
                    lorry or smaller car, where the vibration levels will normally
                    be significantly more severe than on trains, ships and planes.


2. OBJECT           The object is to verify that the equipment is of a sufficiently
   OF TEST:         rugged construction to withstand the vibrations as modified by
                    the cushioning. The cushioning will, if it is correctly de-
                    signed, attenuate vibration at higher frequencies. The equip-
                    ment is sensitive to those frequencies, where internal resonan-
                    ces occur. If resonances occur at higher frequencies, the
                    cushioning will protect the equipment, and, if not, the vibra-
                    tions could be amplified. Vibration response investigation is
                    not included, but the vibration isolation provided by the
                    cushioning can be measured with an accelerometer on the equip-
                    ment.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    -       IEC 68-2-36, Test Fdb, (1973), Random Vibration, Wide
                            Band, Reproducibility Medium. Confirmation of vibration
                            levels shall be with frequency analysis of 2-5 Hz resolu-
                            tion. Tolerances on ASD are narrowed to ±3 dB.

                    Other    related   documents   are:

                    -       IEC 68-2-47, Mounting of components, equipments, and other
                            articles for dynamic tests.
                    -       IEC 721-3, Classification of groups of environmental para-
                            meters and their severities.


4. TEST            Vibrator with fixture large enough to fulfil IEC requirements
   EQUIPMENT:     on transmissibility, transverse motion of fixture, distortion
                   etc. in a frequency range exceeding 150 Hz.


5. PROCEDURE: 1)            A functional check is carried out.




                                              - 95   -
                                                        M206


                  2)      The equipment is put in its condition for shipment, i.e.
                          shipping bolts and brackets etc. are secured, and the
                          equipment is then packed in the relevant cushioning and
                          package. If required, an accelerometer should be mounted
                          on the equipment.

                  3)      The package is then mounted on a vibrator using stays to
                          hold it firmly against a horizontal plane fixture.

                  4)      Vibration is then applied as specified.

                  5)      Steps 3) and 4) are repeated in the two remaining perpen-
                          dicular axes of the equipment/package. This is achieved by
                          turning the package 90 degrees each time on the horizontal
                          plane fixture.

                  6)      The equipment is unpacked after the exposures and a visual
                          examination as well as a functional check are performed


6. SEVERITY:      ASD 10-20 Hz            :                     0.02 g2/Hz
                  ASD 20-150 Hz                                -3 dB/octave
                  Total rms acceleration:                      1 grms
                  Duration/axis           .
                                          .                    90 min.


                                 /       \ LOG

                       ACCELE-
                       RAT ION
                       SPECTRAL                  I        I
                       DENSITY                   I        I                         octave




                                     I
                                                 I        I
                                                 I        I
                                                 I        I
                                                 I        I                                    1   LOG
                                                                                               I      /
                                             l b HZ      20 HZ       FREQUENCY               150 Hz




7. ADDITIONAL     Before    testing         the      following    details   shall    be      specified:
    INFORMATION
    REQUIRED:     -       If vibration level inside package should be measured with
                         an accelerometer on the equipment.
                  -        Functional checks during/after exposures.
                  -        If any parts of the equipment shall be subjected to a spe-
                           cial visual examination after exposures.


8. REPORT:        A test report shall be prepared, containing at least:

                  -       Identification of equipment tested, test facilities used,
                          and date of test.
                  -       Description of mounting on vibrator (photo).
                  -       Recording of ASD level in reference point.
                  -       Results of functional checks and visual inspections.
                  -       Signatures of responsible test engineers.
                                                      - 96 -
                                                                       NT ELEC M207
nordtest method                                                        Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


VIBRATION RANDOM: VEHICLE INSTALLED AND PORTABLE ELECTRONIC EQUIPMENT


1. SCOPE:            Electronic devices usually rack mounted in vehicles and also
                     used as independent portable units outside the vehicle in
                     various environmental conditions also on other types of
                     vehicles e.g. on small free time boats. A major application is
                     a mobile radio telephone (NMT) supplied with optional portable
                     rack and battery unit.


2. OBJECT            Primarily to demonstrate the capability to function in accor-
   OF TEST           dance with the relevant performance specifications in the pre-
                     sence of vibration, thus exposing poor alignment, loose con-
                     tacts microphony etc.

                     Secondarily to demonstrate mechanical robustness and changes in
                     electrical performance as a result of exposure to vibration for
                     a certain time.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     -       IEC 68-2-36, Test Fdb, Random vibration, wide band, repro-
                             ducibility medium.

                     Other    related   documents   are:

                     -       IEC 721-3-5,   Ground vehicle installations, Class 5M2.
                     -       IEC 721-3-7,   Portable and non-stationary use, Class 7M2.
                     -       IEC-68-2-47,   Mounting of components, equipments, and other
                             articles for   dynamic tests.


4. TEST              Vibrator capable of vibrating in both vertical and horizontal
   EQUIPMENT:        axes in conformance with the requirements specified for trans-
                     missibility transverse motion, distortion etc.
                     Tolerance limit for reference point is ±6 dB.
                     Tolerance limit for rms acceleration is ±1.5 dB.


5.   PROCEDURE:      1)      Mounting
                             The actual mounting devices as the vehicle rack and the
                             transportation rack will be used in order to study their
                             effect on the frequency response. The racks are mounted
                             rigidly and the equipment is installed on them supported
                             only by the normal mounting locks or devices.




                                               - 97 -
                                                 M207


                 2)       Functional    measurements      are    performed     before   the   exposure.

                 3)   Resonance        search
                      The resonance search includes measurement of mechanical
                      frequency  responses. Measurements are carried out with
                      sine sweep as specified in CLAUSE 6. The test specimen is
                      in switch-off position except for the last sweep during
                      which the function is measured or monitored.

                 4)   With the specimen in switch-on position the test level is
                      increased to the specified random test level which is
                      applied for the specified length of time.

                 5)   Functional measurements and monitoring of operation are
                      performed throughout the test.

                 6)   Steps 2) to 5) are repeated in three perpendicular axes
                      for the first mounting option.

                 7)   Steps 2) to 6) are repeated with the other rack mounting
                      option (s) in three perpendicular axes.


6.   SEVERITY:   -    Resonance        search    (sine    sweep)
                      Acceleration :                9.8 m/s2 (1 g)
                      Frequency range:              10-500 Hz
                      Rate of sweep :               log, 1 octave/min.

                 -    Endurance        test     (random   vibration)
                      ASD 10-200 Hz           :                  0.01 g2/Hz
                      ASD 200-500 Hz          :                  0.003 g2/Hz
                      Total rms accelation :                    1.7 grms
                      Duration/axis/mounting:                   30 min.


7. ADDITIONAL    Before    testing     the    following    details   shall     be   specified:
   INFORMATION
   REQUIRED:     -     Functional checks during and after the exposure.
                 -    What parts of the equipment shall be specially monitored
                      for frequency response.


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities used,
                      and date of test.
                 -    Description of mounting on vibrator machine for the three
                      exposure directions (photo, drawing, etc.).
                 -    Recording of vibration response in the reference point.
                 -    Results of functional tests and visual inspections.
                 -    Signatures of responsible test engineers.




                                                - 98 -
                                                                                NT ELEC M301
 nordtest method                                                                Approved  1990-06




ENVIRONMENTAL    TEST   PROCEDURE:


TRANSIENT VIBRATION: ELECTRONIC UNIT MOUNTED ON NON-RIGID STRUCTURE


1. SCOPE:          This procedure is applicable to equipment such as control or
                   display units mounted on non-rigid structures. The structures
                   are occasionally excited to transient oscillating motions by
                    impacts from adjacent traffic or wind gusts. An example is
                   mounting on a light partition wall excited by slamming door.
                   The equipment is assumed to have its own mounting flanges and
                    it weighs typically 5-25 kg.


2. OBJECT           This test is aimed at demonstrating the strength of mounting
   OF TEST:         flanges and internal fastening of heavy components. Failures
                    are associated with deformations and rupture of structural com-
                    ponents and with, for instance relays making unwanted breaks or
                    contacts.


3. RELATED          The test is performed according to:
   DOCUMENTS:
                    -       IEC   68-2-57,   Test   Ff,    Vibration,   Time-history   method.

                    Other    related   documents    are:
                    -       IEC 68-2-6, Test Fc, Vibration, Sinusoidal.
                    -       IEC 68-2-47, Mounting of components, equipments, and other
                            articles for dynamic tests.
                    -       IEC 721-3, Classification of groups of environmental para-
                            meters and their severities.


4. TEST             This test requires an electromagnetic or electrohydraulic
    EQUIPMENT:      vibrator, controlled by a computer system to generate and ana-
                    lyze the transient acceleration within the specified frequency
                    range. Reproducibility requirements are as given in IEC 68-2-6.


5. PROCEDURE: 1)            The equipment is mounted on the vibrator using its normal
                            means of mounting, i.e. flanges and screws. Any special
                            brackets etc. shall be included. It is important also,
                            that external cables and connections are included and
                            fastened to simulate conditions during use. If a special
                            mechanical interface for mounting is required, a corre-
                            sponding fixture must be produced.

                   2)       A functional check is performed before exposures.




                                               - 99 -
                                                            M301


                  3)        With the equipment switched on and, as far as possible,
                            running in a continuous functional mode, five transients
                            are applied.

                  4)        Steps 1) and 3) are repeated for each of the two remaining
                            axes of the test specimen.

                  5)        A       functional          check   is   performed   after   exposures.


6. SEVERITY:      Test frequency range :                        l0-500 Hz
                  Time history duration:                        500 ms, maximum.

                  Required               response       spectrum:
                  Damping parameter :   5% (Q = 10)
                  Level     l0-20 Hz : +12 dB/octave
                            20-167 Hz:  30 g
                           167-333 Hz: -9 dB/octave
                           333-500 Hz:   zero-period level:                               10 g

                  Number            of     time-histories:           15, 5 in each of 3 axes




                       +1 2dB/




                        9                     .                         .          .             l


                                .             .                          .          .            .



                                           Required Response Spectrum, 5% damping



7. ADDITIONAL     Before        testing           the    following    details    shall   be   specified:
    INFORMATION
    REQUIRED:     -         If it is necessary to produce a special vibration fixture
                            to simulate mounting conditions in use.
                  -         Functional  checks  before/during/after exposures.
                  -         If any parts of the equipment shall be subjected to a spe-
                            cial visual examination after exposures.


8. REPORT:        A test report shall be prepared, containing at least:

                  -         Identification of equipment tested, test facilities used,
                            and date of test.
                  -         Description of mounting on vibrator for each exposure
                            direction (photo, drawing).
                  -         Recording of reference point acceleration transient and
                            test response spectrum.
                  -         Results of functional checks and visual inspections.
                  -         Signatures of responsible test engineers.
                                                          - 100 -
                                                                      NT ELEC M401
nordtest method                                                       Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


BUMP TEST: EQUIPMENT INSTALLED IN RAILWAY CARRIAGES


1. SCOPE:            This procedure is applicable to electronic equipment for fixed
                     installation in railway carriages in general. Typical examples
                     are equipment for internal communication or air-conditioning.
                     The exposure covers those impacts which may occur as a result
                     of slamming of doors, heavy objects being handled in the vici-
                     nity etc. The procedure is not intended for installation on
                     boogies etc.


2. OBJECT            To demonstrate that mechanical, one-sided bumps do not impair
   OF TEST:          the functioning due to accumulating mechanical displacements in
                     circuit boards, cabling, heavy components etc. The test should
                     cover the "shock" requirements of several national railway
                     authorities.


3.    RELATED        The test is performed according to:
     DOCUMENTS:
                     -       IEC 68-2-29, Test Eb, Bump.

                     Other    related   documents   are:

                     -       IEC 68-2-47, Mounting of components, equipments, and other
                             articles for dynamic tests.
                     -       IEC 571, Rules and regulations for electronic equipment
                             used on rail vehicles.
                     -       IEC 721-3-5, Ground vehicles installations.


4. TEST              Vibrator, electrodynamic or electrohydraulic, controlled by
   EQUIPMENT:        computer, or special bump machine. Transverse axis acceleration
                     shall not exceed 30% of nominal, specified amplitude, and the
                     bumps shall be applied at a rate of l-3 per sec.


5.   PROCEDURE:      1)      The equipment is mounted on vibrator or bump machine using
                             its normal means of mounting. Any special brackets etc.
                             shall be included. It is important also, that external
                             cables and connections are included and fastened to simu-
                             late conditions during normal use.

                     2)      A functional check is performed before exposures.




                                              - 101 -
                                            M401


                 3)   With the equipment in the switch-on condition, the spe-
                      cified number of bumps are applied.

                 4)   During the last bump exposures, a functional check is
                      carried out.

                 5)   Steps l), 3), and 4) are repeated in both remaining axes.

                 6)   A functional check is performed after the exposures.


6. SEVERITY:     Peak acceleration :




                       - log
                                                10 9
                 Pulse duration                 16 ms
                 Number of directions:          3 mutually perpendicular
                 Number of bumps      :         lOOO/direction




                      A
                      I-   16ms--j

                      j-----0.3 - 1 sec- I




7. ADDITIONAL    Before   testing   the   following   details   shall   be   specified:
   INFORMATION
   REQUIRED:     -    If it is necessary to produce a special fixture to simu-
                      late mounting conditions in normal use.
                 -    The three directions of exposures, if choice is critical.
                 -    Functional checks and modes before/during/after the expo-
                      sures.
                 -    If any parts of the equipment shall be subjected to a spe-
                      cial visual examination after the exposures.


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities used,
                      and date of test.
                 -    Description of mounting on vibrator/bump machine to the
                      three chosen exposure-directions (photo, drawing).
                 -    Recording of reference point acceleration pulse.
                 -    Results of functional checks and visual inspections.
                 -    Signatures of responsible test engineers.




                                          - 102 -
                                                                      NT ELEC M402
nardtert method.                                                      Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


BUMP TEST: ELECTRONIC EQUIPMENT INSTALLED ON STATIONARY STRUCTURES


1. SCOPE:            This procedure is applicable to electronic equipment for fixed
                     installation in buildings, shelters etc. A typical example is a
                     telecommunication centre. The exposure covers those impacts
                     which may occur as a result of slamming of doors, heavy traffic
                     in the vicinity etc. The procedure is not intended for instal-
                     lation on machinery or movable parts.


2. OBJECT            The object is to verify the functional performance of important
   OF TEST:          and delicately constructed equipment for which small impacts
                     cannot be disregarded, at least in some installations. The pro-
                     cedure can reveal bad electrical contacts and dislocation in
                     "loose" mountings etc.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     -      IEC 68-2-29, Test Eb, Bump.

                     Other related documents are:
                     -      IEC 68-2-47, Mounting of components, equipments, and other
                            articles for dynamic tests.
                     -      IEC 721-3-3, Stationary use at weather-protected loca-
                            tions.


4. TEST              Vibrator, electrodynamic    or electrohydraulic, controlled by
   EQUIPMENT:        computer, or special bump    machine. Transverse axis acceleration
                     shall not exceed 30% of     nominal, specified amplitude, and the
                     bumps shall be applied at   a rate of l-3 per sec.


5.   PROCEDURE:      1)    The equipment is mounted on vibrator or bump machine in
                           its normal orientation using its normal means of mounting.
                           Any special brackets etc. shall be included. It is impor-
                           tant also, that external cables and connections are in-
                           cluded and fastened to simulate conditions during normal
                           use.

                     2)    A functional check is performed before exposures.




                                           - 103 -
                                                M402


                   4)   During all bump exposures, the           electrical   function   is
                        monitored as specified.

                   5)   Steps l), 3), and 4) are repeated in both remaining
                        directions.

                   6)   A functional check is performed after the exposures.


6.    SEVERITY:    Peak acceleration :           5      g
                   Pulse duration                     6 ms
                   Number of directions:              3 mutually perpendicular
                   Number of bumps      :              100 per direction




                         - 5g \
                        A . . .-‘:\-
                        I-    6ms-{

                        t - 0 . 3   -   1   set---I




7.    ADDITIONAL   Before testing the following details shall be specified:
     INFORMATION
     REQUIRED:     -    If it is necessary to produce a special fixture to simu-
                        late mounting conditions in normal use.
                   -    The three directions of exposures, if choice is critical.
                   -    Functional checks and modes before/during/after the expo-
                        sures.
                   -    If any parts of the equipment shall be subjected to a spe-
                        cial visual examination after the exposures.


8. REPORT:         A test report shall be prepared, containing at least:

                   -    Identification of equipment tested, test facilities used,
                        and date of test.
                   -    Description of mounting on vibrator/bump machine for the
                        three chosen exposure directions (photo, drawing).
                   -    Recording of reference point acceleration pulse.
                   -    Results of functional checks and visual inspections.
                   -    Signatures of responsible test engineers.




                                            - 104 -
                                                                     NT ELEC M403
nordtest method                                                      Approved 1990-06




ENVIRONMENTAL    TEST    PROCEDURE:


BUMP TEST: ELECTRONIC UNITS MOUNTED ON PRODUCTION MACHINERY


1. SCOPE:           Equipment such as control and monitoring units for general
                    industrial use. Equipment is of medium size, weighing typically
                    about 5 kg and has its own mounting flanges. It could be
                    mounted anywhere on girders and framework of machinery for pro-
                    duction or mechanical handling, where small shocks (bumps) may
                    occur repeatedly from the same direction. No special pre-
                    cautions are prescribed for its mounting, except that it should
                    not be mounted directly on rotating or moving parts.


2. OBJECT           To demonstrate that mechanical bumps do not impair the func-
    TO TEST:        tioning due to mechanical displacements in circuit boards,
                    cabling, heavy components etc. Failures could be associated
                    with misalignments, loose contacts or screws etc. due to accu-
                    mulating displacements resulting from the repeated action of
                    impacts from the same direction.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    l       IEC 68-2-29, Test Eb, Bump.

                    Other    related   documents   are:

                    l       IEC 68-2-47, Mounting of components, equipments, and other
                            articles for dynamic tests.
                    l       IEC 721-3, Classification of groups of environmental para-
                            meters and their severities.


4. TEST             Vibrator, electrodynamic or electrohydraulic, controlled by
   EQUIPMENT:       computer, or special bump machine. Transverse axis acceleration
                    shall not exceed 30% of nominal, specified amplitude, and the
                    bumps shall be applied at a rate of l-3 per sec.


5. PROCEDURE:       1)      The equipment is mounted on vibrator or bump machine using
                            its normal means of mounting, i.e. flanges and screws. Any
                            special brackets etc. shall be included. It is important
                            also, that external cables and connections are included
                            and fastened to simulate conditions during use. If a spe-
                            cial mechanical interface for mounting is required, a
                            corresponding fixture must be produced.




                                             - 105   -
                                              M403


                 2)   A   functional      check   is     performed   before    exposures.

                 3)   With the equipment in the switch-on condition, the spe-
                      cified bumps are applied.

                 4)   During the last bump exposures, a functional check is
                      carried out.

                 5)   Steps l), 3) and 4) are repeated for each of the two
                      remaining  directions.

                 6)   A   functional      check   is     performed   after    exposures.


6. SEVERITY:     Amplitude       :         40 g
                 Duration        :         6 ms
                 Directions                3 mutually perpendicular
                 Number of bumps:          lOOO/direction




                 ‘-   I - 6as-1
                 I     I -0.3 - 1 set-I


7. ADDITIONAL    Before   testing   the    following      details    shall    be   specified:
   INFORMATION
   REQUIRED:     -    If it is necessary to produce a special vibration fixture
                      to simulate mounting conditions in use.
                 -    The 3 directions of exposures, if choice is critical.                     .-
                 -    Functional checks during/after exposures.
                 -    If any parts of the equipment shall be subjected to a spe-
                      cial visual examination after exposures.


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities used,
                      and date of test.
                 -    Description of mounting on vibrator/bump machine for the
                      three chosen exposure-directions (photo, drawing).
                 -    Recording of reference point acceleration pulse.
                 -    Results of functional checks and visual inspections.
                 -    Signatures of responsible test engineers.



                                            - 106    -
                                                                     NT ELEC M404
nordtest method                                                      Approved 1990-06




ENVIRONMENTAL    TEST     PROCEDURE:


BUMP TEST:      EQUIPMENT IN PACKAGE FOR PUBLIC SHIPMENT


1. SCOPE:           This procedure applies to electronic or other equipment in
                    shipping package, when the package and cushioning already has
                    been produced. Shipment is by public post authorities. The
                    complete package would typically weigh less than 80 kg. The
                    bump severity is based on the assumption that in the end the
                    package will be transported on the cargo platform of a lorry or
                    smaller car, where driving over irregular roads would cause
                    small jumps of a few centimetres.


2. OBJECT           The object is to verify that the equipment is of a sufficiently
   OF TEST:         rugged construction to withstand the bumps as modified by the
                    cushioning. The cushioning will, if it is correctly designed,
                    attenuate the peak acceleration of the bump (shock) as seen by
                    the equipment inside the cushioning. An accelerometer can be
                    mounted on the equipment to measure the acceleration pulse
                    time-history transmitted to the equipment.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                     -       IEC 68-2-29, Test Eb, Bump.

                     Other    related   documents   are:

                     -       IEC 68-2-47, Mounting of components, equipments, and other
                             articles for dynamic tests.
                     -       IEC 721-3, Classification of groups of environmental para-
                             meters and their severities.


4. TEST              Vibrator controlled by computer or special bump machine. Trans-
   EQUIPMENT:        verse axis acceleration shall not exceed 30% of nominal, spe-
                     cified amplitude, and the bumps shall be applied at a rate of
                     l-3 per sec.


5. PROCEDURE:        1)      A functional check is carried out.

                     2)      The equipment is put in its condition for shipment, i.e.
                             shipping bolts and brackets etc. are secured and the
                             equipment is then packed in the relevant cushioning and
                             package. If required, an accelerometer should be mounted
                             on the equipment.




                                              - 107 -
                                                   M404


                  3)   The package is then mounted on a vibrator/bump machine
                       using stays to hold it firmly against a horizontal plane
                       fixture.

                  4)   The specified number of bumps are then applied.

                  5)   Steps 3) and 4) are repeated in the two remaining perpen-
                       dicular directions of the equipment/package. This is
                       achieved by turning the package 90° each time on the hori-
                       zontal plane fixture.

                  6)       The equipment is unpacked after the exposures and a visual
                           examination as well as a functional check are performed.


6. SEVERITY:      Amplitude       :               25 g
                  Duration        :               6 ms
                  Directions     :               3 mutually perpendicular
                  Number of bumps:               lOOO/direction




                       i-elfaS-1

                       1   -0.3        -    152c-I




7. ADDITIONAL     Before     testing       the   following   details   shall   be   specified:
    INFORMATION
   REQUIRED:      -        If bump acceleration level inside package should be
                                                                          .
                           measured with an accelerometer on the equipment.
                  -        Functional checks during/after exposures.
                  -        If any parts of the equipment shall be subjected to a spe-
                           cial visual examination after exposures.

8. REPORT:        A test report shall be prepared, containing at least:

                  -     Identification of equipment tested, test facilities used
                        and date of test.
                  -    Description of mounting on vibrator/bump machine for the
                       three chosen exposure-directions (photo, drawing).
                  -
                  0    Recording of reference point acceleration pulse.
                  -    Results of functional checks and visual inspections.
                  -    Signatures of responsible test engineers.




                                                 - 108   -
                                                                   NT ELEC M501
nordtest method                                                    Approved 1990-06




ENVIRONMENTAL   TEST    PROCEDURE:


SHOCK TEST: EQUIPMENT MOUNTED ON DOOR OR SIMILAR MOVABLE PART


1. SCOPE:          Equipment such as control and monitoring units for general
                   industrial use. Equipment is of medium size, weighing typically
                   about 5 kg and has its own mounting flanges. It is mounted on
                   movable mechanical parts, such as a doors, hatches, flaps, tra-
                   velling cranes, etc., where rapid velocity changes are caused
                   by slamming/stopping. This procedure does not apply to small
                   units like transducers which may be attached at locations with
                   more extreme conditions.


2. OBJECT          This test is aimed at demonstrating the strength of mounting
   OF TEST:        flanges and internal fastening of heavy components. Failures
                   are associated with deformations and rupture of structural com-
                   ponents and with, for instance, relays making unwanted breaks
                   or contacts.


3. RELATED         The test is performed according to:
   DOCUMENTS:
                   -       IEC 68-2-27, Test Ea, Shock.

                   Other    related   documents   are:

                   -       IEC 68-2-47, Mounting of components, equipments, and other
                           articles for dynamic tests.

                   -       IEC 721-3, Classification of groups of environmental para-
                           meters and their severities.


4. TEST            Shock machine capable of producing half-sine shocks of the
   EQUIPMENT:      specified amplitude and velocity. Transverse axis acceleration
                   shall not exceed 30% of nominal, specified amplitude.


5.   PROCEDURE:    1)      The equipment is mounted on shockmachine using its normal
                           means of mounting, i.e. flanges and screws. Any special
                           brackets etc. shall be included. It is important also,
                           that external cables and connections are included and
                           fastened to simulate conditions during use. If a special
                           mechanical interface for mounting is required, a corre-
                           sponding fixture must be produced.




                                            - 109 -
                                                M501


                  2)    A    functional     check   is   performed    before       exposures.

                  3)    With the equipment switched on and, as far as possible,
                        running in a continuous functional mode, three shocks are
                        applied.

                  4)    Steps 1) and 3) are repeated for each of the five re-
                        maining  directions.

                  5)    A   functional      check   is   performed    after    exposures.


6. SEVERITY:      Amplitude        :          100 g
                  Duration         :          6 ms
                  Directions                 Both directions of the 3 perpendicular axes
                  Number of shocks:          3 in each direction, 18 shocks totally



                       HALFSINE
                       SHOCKPULSE




                                            6rs-




7. ADDITIONAL     Before    testing   the    following    details    shall    be    specified:
    INFORMATION
    REQUIRED:     -     If it is necessary to produce               a special vibration fixture
                        to simulate mounting conditions              in use.
                  -     Functional checks during/after               exposures.
                  -     If any parts of the equipment               shall be subjected to a spe-
                        cial visual examination after               exposures.


8. REPORT:        A test report shall be prepared, containing at least:

                  -    Identification of equipment tested, test facilities used,
                       and date of test.
                  -    Description of mounting on shock machine for each exposure
                       direction (photo, drawing).
                  -    Recording of reference point acceleration pulse.
                  -    Results of functional checks and visual inspections.
                  -    Signatures of responsible test engineers.




                                             - 110 -
                                                                      NT ELEC M502
nordtest method                                                       Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


SHOCK TEST: EQUIPMENT TO BE SHIPPED IN PACKAGE


1. SCOPE:            This procedure is relevant for electronic equipment intended
                     for general shipment in a cushioned package. The equipment is
                     assumed to weigh 15-50 kg typically. By using this procedure
                     for new prototypes it will be possible to accumulate experience
                     on the basic ruggedness needed of a construction. The alter-
                     native method of making free fall tests with the package will
                     yield results specific to each combination of equipment and
                     package.


2. OBJECT            This test is aimed at finding weak points in the strength of
   OF TEST:          internal fastening of heavy components. The test will also
                     demonstrate if the outer cabinet is suitable for being sup-
                     ported locally by a cushioning in a package. It is normally
                     possible to design an economic package/cushioning for any
                     equipment passing this test. For optimization of the distribu-
                     tion of costs on equipment versus cushioning, a step-stress
                     shock test should be used.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     -       IEC 68-2-27, Test Ea, Shock.

                     Other    related   documents   are:

                     -       IEC 68-2-47, Mounting of components, equipment, and other
                             articles for dynamic tests.
                     -       IEC 721-3, Classification of groups of environmental para-
                             meters and their severities.

4. TEST              Shock machine capable of producing half-sine shocks of the
   EQUIPMENT:        specified amplitude and velocity. Transverse axis acceleration
                     shall not exceed 30% of nominal, specified amplitude.


5.   PROCEDURE:      1)      The test specimen is mounted on the shock machine using
                             stays to hold it firmly against the fixture. The specimen
                             is supported underneath as in a package. The specimen is
                             switched off and it is in its condition for shipping with
                             shipping brackets etc. secured.




                                              - 111 -
                                                 M502


                 2)   Three shocks of the specified severity are applied.

                 3)   A visual inspection is carried out.

                 4)   Steps 1) to 3) are repeated for each of the five remaining
                      directions.

                 5)   A   functional      check    is   performed     after   exposures.


6. SEVERITY:     Amplitude        :          50 g
                 Duration         :          11 ms
                 Directions                 Both directions of the 3 perpendicular axes
                 Number of shocks:          3 in each direction, 18 shocks totally


                                                 - 50g
                      HALFSINE
                                       /
                      SHOCKPUL




                                 /I

                                                        \
                                 -        11ms




7. ADDITIONAL    Before   testing   the    following        details   shall   be   specified:
   INFORMATION
   REQUIRED:     -    If it is necessary to produce special fixtures to simulate
                      support conditions in a package.
                 -    Functional checks after exposures.
                 -    If any parts of the specimen shall be subjected to a spe-
                      cial visual examination after exposures.


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities used,
                      and date of test.
                 -    Description of mounting on shock machine for each exposure
                      direction (photo, drawing).
                 -    Recording of reference point acceleration pulse.
                 -    Results of functional checks and visual inspections.
                 -    Signatures of responsible test engineers.




                                            - 112 -
                                                                      NT ELEC M503
nordtest method                                                       Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


SHOCK TEST: ELECTRONIC UNITS MOUNTED ON             MACHINERY


1. SCOPE:            This procedure can be applied to smaller units, such as trans-
                     ducers, weighing typically less than 2 kg and intended for
                     mounting on machinery in general. The machinery could typically
                     be a production line or similar mechanical handling facility.
                     It is assumed that the unit will not be mounted directly on
                     hammer-heads   etc.


2. OBJECT            This test is aimed at demonstrating the strength of mounting
   OF TEST:          flanges and internal fastening of heavy components. Failures
                     are associated with misalignment and rupture of structural com-
                     ponents and with unwanted electrical break or contact.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     -       IEC 68-2-27, Test Ea, Shock.

                     Other    related   documents   are:

                     -       IEC 68-2-47, Mounting of components, equipments, and other
                             articles for dynamic tests.
                     -       IEC 721-3, Classification of groups of environmental para-
                             meters and their severities.


4. TEST              Shock machine capable of producing half-sine shocks of the
   EQUIPMENT:        specified amplitude and velocity. Transverse axis acceleration
                     shall not exceed 30% of nominal, specified amplitude.


5.   PROCEDURE:      1)      The equipment is mounted on shock machine using its normal
                             means of mounting, i.e. flanges and screws. Any special
                             brackets etc. shall be included. It is important also,
                             that external cables and connections are included and
                             fastened to simulate conditions during use. If a special
                             mechanical interface for mounting is required, a corre-
                             sponding fixture must be produced.

                     2)      A functional check is performed before exposures.




                                              - 113 -
                                              M503


                 3)   With the equipment switched on and, as far as possible,
                      running in a continuous functional mode, three shocks are
                      applied.

                 4)   Steps 1) to 3) are repeated for each of the five remaining
                      directions.

                 5)   A functional check is performed after exposures.


6. SEVERITY:     Amplitude        :        200 g
                 Duration         :        1 ms
                 Directions               Both directions of the 3 perpendicular axes
                 Number of shocks:        3 in each direction, 18 shocks totally      -




7. ADDITIONAL    Before   testing   the   following      details   shall   be   specified:
   INFORMATION
   REQUIRED:     -    If it is necessary to produce a special vibration fixture
                      to simulate mounting conditions in use.
                 -    Functional checks during/after exposures. When monitoring
                      sensors, the required time and frequency resolution must
                      be clearly stated.
                 -    If any parts shall be subjected to a special visual exami-
                      nation after exposures.


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities used,
                      and date of test.
                 -    Description of mounting on shock machine for each exposure
                      direction (photo, drawing).
                 -    Recording of reference point acceleration pulse.
                 -    Results of functional checks and visual inspections.
                 -    Signatures of responsible test engineers.




                                          -   114    -
                                                                     NT ELEC M504
nordtest method                                                      Approved 1990-06




ENVIRONMENTAL    TEST    PROCEDURE:


SHOCK TEST: HAND-CARRIED UNITS, SIMULATION OF FREE FALL


1. SCOPE:           This procedure can be used to simulate the effects of free
                    falls in a very reproducible way. The procedure is relevant for
                    small hand-carried units like transceivers and pagers etc.,
                    which are required to survive falls from 1 m or so. The
                    severity assumes that the fall will be arrested over not less
                    than a couple of millimetres, due to the combined resiliency of
                    the surface and the carrying case.


2. OBJECT          The object is not to test the ability of the outer case to
   OF TEST:         withstand hard point impacts. It is assumed that a resilient
                    carrying case will be used and/or that falls will be towards a
                    resilient surface, as described above. Otherwise this test
                    needs careful consideration of the kind of survival which is
                    required: Availability of spare units, dangers from use of
                    slightly failed units, the expectations of the user etc.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    -       IEC 68-2-27, Test Ea, Shock.

                    Other    related   documents   are:

                    -       IEC 68-2-47, Mounting of components, equipments, and other
                            articles for dynamic tests.
                    -       IEC 721-3, Classification of groups of environmental para-
                            meters and their severities.


4. TEST             Shock machine capable of producing half-sine shocks of the
    EQUIPMENT:      specified amplitude and velocity. Transverse axis acceleration
                    shall not exceed 30% of nominal, specified amplitude.


5. PROCEDURE: 1)            The test specimen, without any carrying case, is mounted
                            on the shock machine using stays to hold it firmly against
                            the fixture. The rigid support underneath the specimen is
                            distributed as in a carrying case or during impact on a
                            resilient surface.

                    2)      A functional check is carried out, and the specimen is
                            left switched on during the exposures.




                                             - 115 -
                                            M504


                 3)    Three shocks of the specified severity are applied.

                 4)    Steps 1) to 3) are repeated for each of the five remaining
                       directions.

                 5)    Functional check and visual inspection, in that order, is
                       carried out after the exposures.


6. SEVERITY:     Amplitude       :        500 g
                  Duration        :        2 ms
                 Directions               Both directions of 3 perpendicular axes
                 Number of shocks:        3 in each direction, 18 shocks totally



                      HALFSINE
                      SHOCKPULSE




7. ADDITIONAL    Before   testing   the   following   details   shall   be   specified:
   INFORMATION
   REQUIRED:     -      If it is necessary to produce special fixtures to simulate
                       support conditions.
                 -     Acceptance criteria, functional checks.
                 -     If any parts of the specimen shall be subjected to a spe-
                       cial visual examination after exposures.


8. REPORT:       A test report shall be prepared, containing at least:

                 -     Identification of equipment tested, test facilities used,
                       and date of test.
                 -     Description of mounting on shock machine for each exposure
                       direction (photo, drawing).
                 -     Recording of reference point acceleration pulse
                 -     Results of functional checks and visual inspections.
                 -     Signatures of responsible test engineers.




                                          - 116 -
                                                                              NT ELEC M601
nordtest method                                                               Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


FREE FALL: EQUIPMENT IN PACKAGE FOR PUBLIC SHIPMENT


1. SCOPE:            This procedure applies to electronic or other equipment in
                     shipping package. Shipment is by public post authorities. The
                     complete package would typically weigh less than 80 kg. The
                     free falls of this procedure correspond to those encountered
                     with manual or mechanical handling during loading and un-
                     loading.


2. OBJECT            The object is to verify that the equipment is of a sufficiently
    OF TEST:         rugged construction to withstand the free falls as modified by
                     the cushioning. The cushioning will, if it is correctly de-
                     signed, attenuate the peak acceleration of the equipment inside.
                     An accelerometer can be mounted on the equipment to measure the
                     acceleration pulse time-history transmitted to the equipment.


3. RELATED           The test is performed according to:
    DOCUMENTS :
                     -      IEC 68-2-32, Test Ed, Free fall.


4. TEST              A special mechanism shall be used to release the equipment from
    EQUIPMENT:       the specified attitudes and heights without imparting an angu-
                     lar momentum to the package. Falls shall be on a flat concrete
                     surface of large mass compared to the package.


5. PROCEDURE:        1)     A functional check is carried out.

                     2)     The equipment with possible shipping brackets etc. is
                            packed normally including cables and manuals. For some
                            packaging materials it is important that these have been
                            stored under standard conditions for testing before the
                            test.

                     3)     Falls from the specified height are performed in sequence
                            without unpacking as follows:

                            -     Two   falls   on    the   bottom surface.
                            -     Two   falls   on   each   of two bottom edges.
                            -     Two   falls   on   each   of two bottom corners.
                            -     Two   falls   on   the    top surface.




                                                - 117 -
                                              M601


                  4)    The equipment is unpacked after the exposures and a visual
                        examination as well as a functional check are performed.


6. SEVERITY:      Height of fall :         Read from the curve below, using the total
                                           weight of the equipment in its package.
                                           Round down to nearest 0.1 m.
                  Number of falls:         12, two in each attitude given above
                  Test surface :           Concrete.

                        Height,   meters


                  1.2
                  1.0


                  0.7

                  0.5



                  0.3



                                                                        200
                                                                         Weight,   kg


7. ADDITIONAL     Before testing the following details shall be specified:
    INFORMATION
   REQUIRED:      -     Climatic preconditioning of package.
                  -     Functional checks before/after exposures.
                  -     If any parts of the equipment shall be subjected to a spe-
                        cial visual examination.
                  -     Recording of acceleration level inside package.


8. REPORT:        A test report shall be prepared, containing at least:
                  -     Identification of equipment and package tested (photo),
                        test facilities used, and date of test.
                  -     Gross package weight and height of fall.
                  -     Results of functional checks and visual inspections.
                  -     Signatures of responsible test engineers.




                                            - 118 -
                                                                    NT ELEC M602
                                                                    Approved 1990-06
nordtest method


ENVIRONMENTAL   TEST    PROCEDURE:


FREE FALL: PORTABLE USED ELECTRONIC EQUIPMENT


1. SCOPE:           This procedure may be used for testing of hand-portable equip-
                   ment, such as for instance portable phones or portable
                   radiation meters, which may be exposed free fall caused by
                   rough handling under the use conditions, including periods of
                   transfer, down time, maintenance and repair. The equipment is
                   normally  unpacked.


2. OBJECT          To verify that the construction of the equipment endures free
   OF TEST:        falls without extensive damages and that there is no mal-
                   function in operation after the test.


3. RELATED         The test is performed according to:
   DOCUMENTS:
                   -       IEC 68-2-32, Test Ed, Free fall. Procedure 1

                   Other    related   documents   are:

                   -       IEC 721-3-7, Classification of groups of environmental
                           conditions and their severities: Portable and non-
                           stationary use.


4. TEST           A special mechanism shall be used to release the equipment
   EQUIPMENT:     from the specified attitudes and heights without imparting an
                  angular momentum to the equipment. The test surface shall be a
                   smouth, hard, rigid surface of concrete or steel.


5.   PROCEDURE:   1)       Initial measurements and visual examination shall be
                           carried out.

                   2)      The equipment shall be put at the required height. The
                           power is switched off during the exposures.

                  3)       Two falls on each of the six surfaces.

                  4)       After the exposures a visual examination and an inspection
                           of function shall be carried out.




                                            - 119 -
                                            M602


6. SEVERITY:     Height of fall is taken from the table below, using the total
                 weight of equipment. Falls are performed from this height in
                 each of the attitudes stated above in the procedure. This makes
                 a total of 12 falls. Test surface shall be concrete.



                     Mass           Fall height
                  <
                  - 1 kg                   1m

                 - < 20 k g
                   -                  0.5 m

                 < 50 kg
                 -                    0.25 m



7. ADDITIONAL    Before   testing   the   following   details   shall   be   specified:
   INFORMATION
   REQUIRED:     -    What kind of minor damages are accepted after the exposure.
                 -    Inspection of function before/after the exposure.


8. REPORT :      A test report shall be prepared, containing at least:

                 -    Identification of equipment and date of test.
                 -    Compliance with this document and results of functional
                      checks and visual examinations.
                 -    Mass of equipment and height of fall shall be stated.
                 -    Signature of responsible engineers.




                                           - 120 -
                                                                               NT ELEC M801
nordtest method                                                                Approved 1990-06




ENVIRONMENTAL     TEST   PROCEDURE:


IMPACT TEST:      ELECTRICAL     APPARATUS   FOR     POTENTIALLY   EXPLOSIVE   ATMOSPHERE


1.    SCOPE:         Electrical apparatus for use in explosive atmosphere, the pro-
                     tection of which is maintained by an endurable encapsulation.
                     Examples of such equipment are apparatus with flameproof enclo-
                     sure or with increased safety.

                     This procedure is not applicable to electrical equipment in
                     mines.


2. OBJECT            To verify security demands on equipment used in hazardous areas
   OF TEST:          (potential presence of explosive atmosphere).


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     -       EN 50014 + Amendment 3, Electrical apparatus for poten-
                             tial explosive atmospheres. General requirements.

                     Other     related   documents   are:

                     -       EN 50018, Flameproof enclosure 'd'.
                     -       EN 50019, Increased safety 'e'.


4. TEST              A 1 kg test mass with an impact head with hemispherical surface
     EQUIPMENT:      (Ø 25 mm) of hardened steel (normally) or polyamid (hardness
                     R 100, for light transmitting parts), a guide tube and a base
                     plate of steel of at least 20 kg, rigidly fixed to a concrete
                     block on the floor.


5.   PROCEDURE:      The test object is visually inspected and the weakest point is
                     considered as exposed part and is marked. On large equipment
                     several exposed parts may be chosen.

                     The equipment is placed on the base plate and the test mass is
                     dropped in the vertical guide tube from prescribed height on
                     the chosen exposed part normal to the point of impact. Normally
                     two drops on each exposed part are performed, and two samples
                     are tested. Light transmitting parts of glass are tested with
                     one impact on each of three samples.




                                               - 121 -
                                              M801


                 The test is normally carried out at room temperature (20°C
                         Plastic encapsulations are tested at high and low
                 temperatures. The high temperature is the highest operating
                 temperature +lO-15°C. The low temperature is the lowest
                 operating temperature -5-10°C.

                 After the test the protection ability of the encapsulation is
                 tested according to the relevant specification (see related
                 documents above).


6. SEVERITY:     Normally        :    7 joule

                 Light transmitting         parts
                 With guard :         2 joule* 1
                 Without guard:       4 joule

                 *l Tested without guard.

                 The severity expressed in joule corresponds to the drop height
                 expressed in decimetres.


7. ADDITIONAL    Electrical apparatus for potentially explosive atmosphere are
   INFORMATION   normally subjected to national requirements. Please see national
   REQUIRED:     regulations before test.


8. REPORT:       A test report shall be prepared, containing at least:

                 -     Identification of equipment tested, test facilities used,
                       and date of test.
                 -     Specification of the chosen exposed part(s) and the
                       mounting of the equipment when testing each part.
                 -     Results of the final protective enclosure test and visual
                       inspections.
                 -     Signatures of responsible test engineers.




                                            - 122    -
                                        NT ELEC
                                        Approved 1990-06




5.3 Electrical Procedures




                            - 123   -
                                                                      NT ELEC El01
nordtest method                                                       Approved 1990-06




ENVIRONMENTAL    TEST    PROCEDURE:


TRANSIENTS, BURST TEST: DIGITAL EQUIPMENT INSTALLED IN RAILWAY CARRIAGES

1. SCOPE:           Equipment such as control, communication or monitoring units
                    installed in railway vehicles, having a number of signal cables
                    and with power supplied as low voltage DC or AC. Disturbing
                    electrical transients are induced in attached cables due to
                    currents in immediate vicinity (electric traction motors) being
                    switched off causing sparks (inductive loads, blowing fuses,
                    relays etc.). These burst transients are especially harmful to
                    digital   equipment.

2. OBJECT           To verify that the very high frequency contents (up to 100 MHz)
   TO TEST:         of these transient bursts do not result in erroneous data or
                    control signals, to verify possible "watchdog" function, re-
                    setting etc. and also to verify that no permanent damages are
                    produced.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    -       IEC 801-4, Electromagnetic compatibility for industrial
                            process and control equipment. Part four: Electrical fast
                            transient  requirements.

                    Other    related   documents   are:

                    -       IEC 801-1, General introduction.
                    -       DS 5103, Immunity of electrical equipment against con-
                            ducted transients.
                    -       SEN SS 436 15 03, issue 2.


4. TEST             -       Burst generator producing 2 kV pulses of both polarities
   EQUIPMENT:               as shown on the figure, coming in 15 ms bursts with pulse
                            repetition rate 2.5 kHz. Burst repetition every 300 ms.
                            Generator output impedance 50 Ω l-100 MHz.
                    -       Capacitive and LC coupling boxes according to IEC
                            TC 65 (Central Office) 39.
                    -       Ground plane, at least 1 x 2 m or more, extending at least
                            0.1 m around the test set-up.

5. PROCEDURE: 1)            Equipment under test, auxiliary peripherals, transient
                            generator and cables are all placed 10 cm above a common
                            ground plane.

                    2)      Signal cables are connected to peripherals or impedances
                            simulating these. Cables are coiled up in "number 8"
                            fashion to limit effective length to 1 m.


                                             - 125 -
                                                E101


                 3)   Common mode-coupling box/low pass filter as specified is
                      inserted into power supply leads, and test generator is
                      connected.
                 4)   Functional    test       is     performed.
                 5)   In each functional mode of the equipment, transients are
                      injected for at least 2 min. in each polarity.
                 6)   Coupling box is left in supply leads, but coupling capaci-
                      tors are now connected to the reference plane.
                 7)   Each group of signal cables, running parallel in actual
                      use, is now in turn exposed to transients using capacitive    -
                      coupling box for each group. At least 2 min. of each
                      polarity for each group. All exposures are repeated for    - .
                      each specified functional mode of the equipment.
                 8)   Exposures may be stopped/resumed                     to     prevent      syncronization
                      with functional cycles.


6. SEVERITY:     Amplitude:     2 kV.      Both polarities.




                                               3 0 0       ms                     I


7. ADDITIONAL    Before   testing   the    following            details   shall       be   specified:
   INFORMATION
   REQUIRED:     -    Functional tests and states before/during/after exposures.
                 -    Peripheral units and cables attached.
                 -    Groups of cables to be exposed and their physical arrange-
                      ments.


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities                               used,
                      and date of test.
                 -    Description of physical set-up (photos).
                 -    Definition and results of functional checks.
                 -    Signatures of responsible test engineers.

                                           -    126    -
                                                                NT ELEC El02
 nordtert method                                                Approved   1990-06




ENVIRONMENTAL TEST PROCEDURE:


TRANSIENTS, BURST TEST: DIGITAL EQUIPMENT INSTALLED IN INDUSTRIAL PLANTS


1. SCOPE:        Equipment such as digital control and monitoring units in-
                 stalled in industrial plant, having a number of signal cables
                 and/or using mains supply. It is foreseen, that large currents
                 in immediate vicinity (same plant) may be switched off causing
                 sparks (inductive loads, blowing fuses, relays etc.) The seve-
                 rity of this procedure is relatively high, corresponding to
                 serious consequence of failure in this environment.

2. OBJECT        To verify that the very high frequency contents (up to 100    MHz)
    OF TEST:     of these transient bursts do not result in erroneous data     or
                 control signals, to verify possible "watchdog" function,     re-
                 setting etc. and also to verify that no permanent damages     are
                 produced.

3. RELATED       The test is performed according to:
    DOCUMENTS:
                 -    IEC 801-4, Electromagnetic compatibility for industrial
                      process and control equipments. Part four: Electrical fast
                      transient  requirements.

                 Other related documents are:

                 -    IEC 801-1, General introduction.
                 -    DS 5103, Immunity of electrical equipments against con-
                      ducted transients.
                  -   SEN SS 436 15 03, issue 2.

4. TEST          -    Burst generator producing 4 kV pulses of both polarities
   EQUIPMENT :        as shown on FIG. 1, coming in 15 ms bursts with pulse
                      repetition rate 2.5 kHz. Burst repetition every 300 ms.
                      Generator output impedance 50 Ω, l-100 MHz.
                 -    Capacitive and LC coupling boxes according to IEC
                      TC 65 (Central Office) 39.
                 -    Ground plane, at least 1 x 2 m or more, extending at least
                      0.1 m around the test set-up.

5. PROCEDURE:    1)   Equipment under test, auxiliary peripherals, transient
                      generator and cables are all placed 10 cm above a common
                      ground plane.

                 2)   Signal cables are connected to peripherals or impedance
                      simulating this. Cables are coiled up in "number 8"
                      fashion to limit effective length to 1 m.

                                     -   127   -
                                                El02


                 3)   Common mode-coupling box/low pass filter as specified is
                      inserted into power supply leads, and test generator is
                      connected.
                 4)   Functional         test is performed.
                 5)   In each functional mode of the equipment, transients are
                      injected for at least 2 min. in each polarity.
                      Coupling box is left in supply leads with short circuit
                      substituted for the generator.
                 7)   Each group of signal cables, running parallel in actual
                      use, is now in turn exposed to transients using capacitive
                      coupling box for each group. At least 2 min. of each
                      polarity for each group. All exposures are repeated for                                    .
                      each specified functional mode of equipment.

                 8)   Exposures may be stopped/resumed to prevent syncronization
                      with functional cycles.


6. SEVERITY:     Amplitude:         4 kV. Both polarities.




                          15   ms    I
                                                3 0 0       ms                     I


7. ADDITIONAL    Before   testing     the   following            details   shall       be   specified:
   INFORMATION
   REQUIRED:     -    Functional tests and states before/during/after exposures.
                 -    Peripheral units and cables attached.
                 -    Groups of cables to be exposed.


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities                                used,
                      and date of test.
                 -    Description of physical set-up (photos).
                 -    Definition and results of functional checks.
                 -    Signatures of responsible test engineers.


                                            -   128     -
                                                                    NT ELEC El03
nordtest method                                                     Approved 1990-06




ENVIRONMENTAL    TEST    PROCEDURE:


TRANSIENTS, SURGE TEST: INDUSTRIAL PROCESS CONTROL EQUIPMENT

1. SCOPE:           Industrial process control apparatus used in normal industrial
                    environment. The measuring and control cables are installed
                    within the same building. The same procedure may be used on
                    other types of equipment, like alarm systems and information
                    technology systems in locations like shops, offices, labora-
                    tories, etc.


2. OBJECT           To set minimum requirements on terminal protecting circuits
    OF TEST:        in order to keep a high reliability in environments with large
                    power consumers and induced disturbances from atmospheric
                    lightning. It is not applicable to circuits with direct connec-
                    tion to overhead telecommunication and power lines.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    .      SS 436 15 03, Electronic equipment for industry and trade-
                           immunity to conducted electromagnetic interference.
                           Environmental classification and tests (1986).


4. TEST             Surge voltage generator producing positive and negative voltage
   EQUIPMENT:       transients with 1.2 µs rise time and with 50% pulse length of
                     50 µs from a source of 500 Ω impedance. The source energy shall
                    be 0.2 joule. The shape and amplitude shall be controlled with
                    an oscilloscope.


5. PROCEDURE:       The performance of the test object is controlled before and
                    after the test. During the test, the test object is detached
                    from all other equipment and from the mains. If there are many
                    identical terminals, only a few have to be tested.

                    1)     Common mode voltage test is performed between terminals
                           short-circuit and the earth (normally the protective
                           earth). If there are more than two terminals, they shall
                           be grouped in couples, which are natural considering the
                           installed system.

                           If protective earth is missing another terminal group
                           shall be connected to the test pulse generator instead of
                           the earth.




                                         - 129 -
                                            El03


                           If the terminals shall be connected to a shielded cable
                           not containing disturbing lines, the shield shall be con-
                           nected to the pulse generator instead of the terminals.
                           The cable shall be terminated as in an installed systems.

                      2)   Serial mode voltage test is performed between the ter-
                           minals. This test is normally not required on terminals
                           connected to shielded or twisted cables, which do not con-
                           tain disturbing lines.


     6. SEVERITY:     3 positive and three negative pulses of 3 kV on each selected
                      couple. At least 5 sec. between pulses.


     7. ADDITIONAL    The test may be performed with power on and the equipment in
        INFORMATION   a functioning state. It shall be specially stated, if this
        REQUIRED:     shall be the case.

                      Breakdown may occur during the test. It shall be stated, if
                      this is not allowed.

._
     8. REPORT:       A test report shall be prepared, containing at least:

                      -    Identification of equipment tested, test facilities used,
                           and date of test.
                      -    Description of the physical set-up (drawings or photos).
                      -    Result of the functional tests.
                      -    Signatures of responsible test engineers.




                                          - 130 -
                                                                    NT ELEC El04
nordtest method                                                     Approved 1990-06




ENVIRONMENTAL     TEST   PROCEDURE:


TRANSIENTS, l-MHZ TEST: INDUSTRIAL PROCESS CONTROL EQUIPMENT

1. SCOPE:            Industrial process control apparatus used in normal industrial
                     environment. Power is normally distributed separately to the
                     equipment from the mains. The same procedure may be used on
                     other types of equipment, like alarm systems and information
                     technology systems installed directly to the mains.


2. OBJECT            To ensure reliable operation when voltage transients from load
   OF TEST:          switching (tyristors, high-voltage switchgears, etc.) are pre-
                     sent on power, signal and control cables.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                           SS 436 15 03, Electronic equipment for industry and trade-
                           immunity to conducted electromagnetic interference.
                           Environmental classification and tests (1986).


4. TEST              Generator producing the required test pulse according to FIG. 1
   EQUIPMENT:        below. The source impedance shall be 200 Ω. The coupling capa-
                     citances shall have a sufficient voltage withstand capability.




                         Half amplitude after 3 - 6 cycles

                     FIG. 1


5.   PROCEDURE:      The performance of the test object is controlled during the
                     test. It is important that the test program is so designed that
                     reading of signals on the tested cable is performed during the




                                         - 131   -
                                                El04


                    application of the test pulses. If it is not possible to syn-
                    chronize data transfer with test pulse generation, the test
                    should be prolonged in order to achieve a probable coincidence.

                    1)      Comnon mode test on individual circuits. The test pulse
                            generator is capacitively connected to the circuits under
                            test according to FIG. 2a. Test pulses of prescribed
                            severity are applied.

                    2)      Series mode test on individual circuits. The test pulse
                            generator is capacitively connected to the circuits under
                            test according to FIG. 2b. Test pulses of prescribed
                            severity are applied.

                    3)      Common mode test between two circuits. If signal reference-
                            in the EUT is ungrounded, another circuit shall serve as
                            return lead instead of the case of the EUT as in FIG. 2a.

                    4)      Comnon mode test between apparatus in multiple earthed
                            systems. The test pulse is applied between different earth
                            pbints in multiple earthed system.




       coupling    I    con.              I                coupling
                   L me- - I I - - ” - -14
       capacitor                                           capacitor

Common mode voltage test                          Serial mode voltage test

FIG. 2a                                          FIG. 2b


6. SEVERITY:        Comnon mode               :
                                              .          1 kV
                    Serial mode               :          0 . 5 kV
                    Coupling capacitor C                10 nF
                    Distribution capacitor CFi          50 nF


7. ADDITIONAL       Performance tests shall be described and requirements shall be
    INFORMATION     stated in the test program.
   REQUIRED:


8. REPORT:          A test report shall be prepared, containing at least:

                    -       Identification of equipment tested, test facilities        used,
                            and date of test.
                    -       Description of the physical set-up (drawings or photos).
                    -       Result of the functional tests.
                    -       Signatures of responsible test engineers.


                                              - 132 -
                                                                        NT ELEC El05
nordtest method                                                         Approved 1990-06




ENVIRONMENTAL     TEST       PROCEDURE:


TRANSIENTS, SPARK TEST: INDUSTRIAL PROCESS CONTROL EQUIPMENT

1. SCOPE:            Industrial process control equipmenmt used in normal industrial
                     environment. Sensitive and disturbing circuits are not con-
                     nected to the same cable. The same procedure may be used on
                     other types of equipment, like alarm systems and information
                     technology systems in locations where relays, contactors and
                     power switches are installed.


2. OBJECT            To ensure reliable operation when fast voltage transients from
   OF TEST:          mechanical switches are present on power, signal and control
                     cables.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                         -     SS 436 15 03, Electronic equipment for industry and trade-
                               immunity to conducted electromagnetic interference.
                               Environmental classification and tests (1986).


4. TEST              Spark generator producing the same sort of voltage transient
   EQUIPMENT:        showers as when an inductive current is broken by a mechani-
                     nical switch. The shower is typically 0.5 ms and consists of
                     a great number of voltage transients with increasing ampli-
                     tude and period time. A few transients are of indicated seve-
                     rity. No one is higher than the upper limit.


5.   PROCEDURE:      The performance of the test object is controlled during the
                     test. It is important that the test program is so designed that
                     reading of signals on the tested cable is performed during the
                     application of the test pulses. If it is not possible to syn-
                     chronize data transfer with test pulse generation, the test
                     should be prolonged in order to achieve a probable coincidence.

                     1)       Common mode test on between cable and case. The test pulse
                              generator is capacitively connected to the cable by wrap-
                              ping about 1 m of the cabel with Al-foil. The other ter-
                              minal of the test pulse generator is connected to the case
                              or protective earth of the EUT.




                                             - 133 -
                                                      El05


                   2)       Common mode test between cable and cable. If the signal
                            zero is not connected to protective earth or the case, the
                            test pulse generator is connected capacitively to two dif-
                            ferent cables.

                   3)       Common mode test between cable and reference earth. If
                            only one cable is connected to the EUT and the EUT should
                            be installed unearthed it shall be placed 0.1 m above a
                            metallic reference earth plane. The test pulse generator
                            is capacitively connected to the cable and to the refe-
                            rence plane.



                                   Test circuits


                 Al-foil
                    lm           lm
                                          EUT f
                                                  1
                                                        Reference
                                              I                     plane




                        Sl and S2 conditions according to the text.




6. SEVERITY:       2-4 kV, 1 pulse/s, 2 min. exposure                 time   per   polarity.


7. ADDITIONAL      Performance      requirements shall be stated in the test program.
   INFORMATION
   REQUIRED:


8. REPORT:         A test report shall be prepared, containing at least:

                   -       Identification of equipment tested, test facilities used,
                           and date of test.
                   -       Description of the physical set-up (drawings or photos).
                   -       Result of the functional tests.
                   -       Signatures of responsible test engineers.




                                                  - 134 -
                                                                              NT ELEC El06
nordtert methotly                                                             Approved 1990-06




ENVIRONMENTAL    TEST    PROCEDURE:


TRANSIENTS, SURGE TEST: ELECTRONIC SECURITY EQUIPMENT

1. SCOPE:           Electronic equipment such as fire and burglar alarm centrals
                    are exposed to surge voltages on the mains cables. The surge
                    transients are caused by switching of inductive loads and
                    lightening strokes. These surge transients may cause destruc-
                    tion of diodes, Zener diodes, transistors, etc.


2. OBJECT           To verify the insulation of electronic parts which are not
    OF TEST:        grounded.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    -       SS 4361503 (1984) Class PL 4.

                    Other related documents are:
                    -    IEC 60-2, first edition.
                    -    IEC 255-4, first edition.


4. TEST             Surge    transient   generator   with   the   following   characteristics:
   EQUIPMENT:
                    Pulse rise time : 1.2 µs
                    Pulse width : 50 µs
                    Pulse amplitude : 5.5 kV
                    Pulse energy : 0.5 J
                    Internal impedance: 500 Ω

                    The amplitude of the pulse is the voltage value at the output
                    of the surge generator prior to connecting the apparatus with
                    its terminals.


5. PROCEDURE:       1)      The test sample is disconnected from the mains supply.

                    2)      Signal cables shall be disconnected.

                    3)      Input and output terminals are earthed.
                    4)      The transients generator shall be connected directly to
                            the terminals to be tested.




                                             - 135 -
                                                        El06


                  5)        Three positive and three negative surge voltages are
                            applied at intervals of at least 5 sec.

                  6)        The surge voltage is applied:
                            l    between the terminals of the power circuit,
                            l    between earth terminal and each terminal of the
                                 power circuit successively.

                  7)        After       testing, the test object is to be ready for use.


6. SEVERITY:      Amplitude:               5 kV. Both polarities.


                       V O ltage

                      U
                  0.9




                  0.5


                                                       \
                      0.1
                                                                    Time
                                      µs

                                           50 µs




7. ADDITIONAL     Before           testing     the   following   details   shall   be   specified:
    INFORMATION
    REQUIRED:     -          Functional tests and states before/between/after exposures.
                  -         Terminals to be exposed in addition to those mentioned in
                            CLAUSE 5, step 6).
                  -         If flash-over shall be considered a fault criterion, even
                            if the test object is not permanently damaged.


8. REPORT:        A test report shall be prepared, containing at least:

                  -         Identification of equipment tested, test facilities used,
                            and date of test.
                  -         Description of the physical set-up (drawings or photos).
                  -         Result of the functional tests.
                  -         Signatures of responsible test engineers.




                                                     - 136 -
                                                                      NT ELEC E201
nordtest method                                                       Approved 1990-06




ENVIRONMENTAL    TEST    PROCEDURE:


CONDUCTED SUSCEPTIBILITY, MAINS FREQUENCY DISTURBANCE: INDUSTRIAL PROCESS
CONTROL APPARATUS


1. SCOPE:           Industrial process control apparatus used in light and normal
                    industrial environment. The lengths of measuring and control
                    cables are limited to about 100 m. The same procedure may be
                    used on other types of equipment, like alarm systems and infor-
                    mation technology systems at locations like shops, offices,
                    laboratories, etc.


2. OBJECT           To verify that normal potential differences in buildings due to
   OF TEST:         mains frequency ground currents and induced currents in signal
                    and control cables normally present in installed systems do not
                    introduce measuring faults and incorrect function.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    -       SS 436 15 03, Electronic equipment for industry and trade-
                           immunity to conducted electromagnetic interference.
                                                                     El9
                           Environmental classification and tests (1986).


4. TEST             AC-power supply of at least 250 Veff with the ability to change
   EQUIPMENT:       the phase relation to mains frequency. It may also be conveni-
                    ent to use a power audio generator -with a frequency slightly
                                                - 137
                    less or higher than the mains frequency.


5. PROCEDURE:       1)     The test object is arranged so that function monitoring
                           can be made during the test. The equipment used for func-
                           tion monitoring shall not interfere with the test. The
                           signal cables shall be loaded with normal impedances.

                    2)     The test generator is connected in both serial and common
                           mode according to the following figure.

                                 distribution

                                                                                  Test
                                                                                   object
                                                earth am.                          earth con.
                                 coupling                            coupling
                                 capacitor                           capacitor

                           Common mode voltage test          Serial mode voltage test
                                              E201


                  3)   The voltage is applied according to the prescribed severi-
                       ty. If the signal cable contains more than two wires, that
                       are connected to the test object (multi-wire), the connec-
                       tion of the test pulse is made to selected pairs (signal
                       related) in sequence.

                  4)   The phase is slowly changed during the test, while the
                       function is controlled according to the relevant specifi-
                       cation.

                  5)   The test is repeated for all signal leads that may be
                       disturbed.


6. SEVERITY:      The severity is expressed as a combination of amplitude,
                  coupling capacitance, and duration.

                  Test class : PL3
                  Amplitude : 250 Veff ±5%, 50 HZ ±2%
                  Coupling capacitor : 10 nF (serial mode)
                                                100 nF (common mode)
                  Distribution capacitor : 500 nF
                  Duration : 2 min./tested terminal


7. ADDITIONAL     Before   testing   the   following     details   shall   be   specified:
    INFORMATION
    REQUIRED:     -    The apparatus shall be fully documented so it is possible
                       for the test engineer to analyse the circuits.
                  -    If there are prescribed cables and connectors, they or
                       equivalent shall be used. If shielded cables shall be used
                       only common mode test between associated apparatus shall
                       be made.
                  -    The condition for approval shall be stated.


8. REPORT:        A test report shall be prepared, containing at least:

                  -    Identification of equipment tested, test facilities used,
                       and date of test.
                  -    Specification of the tested cables chosen and the tests.
                  -    Definition and result of the functional checks.
                  -    Signatures of responsible test engineers.




                                           - 138     -
                                                                                   NT ELEC E202
nordtest method                                                                    Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


CONDUCTED SUSCEPTIBILITY, HIGH FREQUENCY VOLTAGES: ELECTRONIC CONTROL EQUIPMENT
ON SHIPS


1. SCOPE:            Electronic measurement and control equipment on ships. The
                     method is used when radiated field disturbances are likely to
                     be picked up by and injected into the equipment through con-
                     necting cables and cause interferences rather than by direct
                     radiation on the case.


2. OBJECT            To verify that electromagnetic field from close radio trans-
   OF TEST:          mitters within the actual frequency range does not influence
                     the function of the equipment.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     -       Lloyd's    Registers    Type    Approval   Scheme   1985.

                     Other    related    documents    are:

                     -       MIL-STD 462, Electromagnetic Interference Characteristics,
                             measurement of, test CS 02.


4. TEST              A shielded room in order to prevent emission to the surroun-
   EQUIPMENT:        dings. Signal generators, amplifiers and coupling networks able
                     to create the required signal amplitude on the connecting
                     cables. The signal amplitude shall be controlled by measure-
                     ment on the tested terminals.


5.   PROCEDURE:      1)      The EUT is connected to the power supply through coupling
                             networks, and shall be running in a predetermined func-
                             tional mode.

                     2)      The signal generator shall be connected to the coupling
                             network and the frequency shall be slowly swept from the
                             lower to the upper frequency limit, while supervising the
                             function. The amplitude shall be maintained at 1 V (carrier).

                     3)      The test shall be made on both supply terminals.

                     4)      The sweep rate shall be low enough to detect any malfunc-
                             tion. Normally a sweep rate of 1.5 x l0-3 decades/sec. is
                             sufficient.




                                               - 139 -
                                             E202


    6. SEVERITY:      10 kHz - 50 MHz,
                      Amplitude : 1 V (carrier)
                      Modulation : 30% AM, 1 kHz


    7. ADDITIONAL     If the test object has delayed indication, the sweep time may
        INFORMATION   be prolonged in order to be able to detect influences. If the
        REQUIRED:     EUT has more than one functional mode, all functional modes
                      under which tests shall be conducted shall be specified.

                      If installation shall be done with special grounding arrange-
                      ments, this shall also be done in the test set-up.


    8. REPORT:        A test report shall be prepared, containing at least:

                      -    Identification of equipment tested, test facilities used,
                           and date of test.
                      -    Description of the physical set-up (drawings or photos).
                      -    Result of the functional tests.
                      -    Signatures of responsible test engineers.

.




                                          - 140 -
                                                                     NT ELEC E301
nordtert method                                                      Approved 1990-06




ENVIRONMENTAL    TEST    PROCEDURE:


ELECTROMAGNETIC FIELDS: IMMUNITY OF SECURITY CENTRAL UNITS IN BUILDINGS


1. SCOPE:           Electronic equipment such as fire and burglar alarm central
                    units installed in receptions, halls etc. where there is some
                    shielding from transmitters and where the operation of hand-
                    portable transceivers is not probable.


2. OBJECT           To demonstrate that external electromagnetic fields will not
   OF TEST:         penetrate the electronics and cause malfunctions such as false
                    alarms.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    -       IEC 801-3, Radiated electromagnetic field requirements.

                    Other    related   documents   are:

                    -       IEC 801-1, General Introduction.
                    -       SS 436 15 23, Immunity to radio frequency electromagnetic
                            fields.
                    -       DS 5106, Immunity of electrical equipment against electro-
                            magnetic fields, 150 kHz - 12 GHz.


4. TEST             A shielded room to prevent emission to the environment. In
   EQUIPMENT:       order to prevent reflections within the room, it should be as
                    large as possible and preferably equipped with absorbers.
                    Signal generator, broad band power amplifier and antennas to
                    generate the required field strength. Field strength meter to
                    verify the field at the specimen.


5. PROCEDURE:       1)      The field strength is verified at an insulating table
                            before the test specimen is placed there.

                    2)      The test specimen is placed on the insulating table and
                            connected to power and signal cables according to the
                            installation instructions. The front of the specimen shall
                            face the transmitting antenna.

                    3)      A functional test is performed before exposure.




                                             - 141 -
                                            E301


                4)   The specimen is left switched on in its normal functional
                     mode.

                5)   The specimen is now exposed to the specified field
                     strength in the range 27-1000 MHz, while the function is
                     monitored continuously. If the frequency is changed in
                     discrete steps, these shall be less than 1% of the current
                     frequency.

                6)   When functional       disturbances   occur,   the      frequency   is
                     recorded.

                7)   When more functional modes are relevant, the procedure is
                     repeated for each mode.


6. SEVERITY:    Frequency range:         27-1000 MHz
                Field strength :         3 V/m
                Modulation     :         80% AM, 1 kHz sine wave


7. ADDITIONAL   Before   testing   the   following   details   shall   be    specified:
  INFORMATION
   REQUIRED:    -    Peripheral units and cables attached, and their physical
                     arrangement.
                -    Functional tests, modes and monitoring, including failure
                     criteria.


8. REPORT:      A test report shall be prepared, containing at least:

                -    Identification of equipment tested, test facilities used,
                     and date of test.
                -    Description of physical set-up (photos).
                -    Definition and results of functional checks and monitoring
                -    Signatures of responsible test engineers.




                                         - 142   -
                                                                     NT ELEC E302
nordtest method                                                      Approved 1990-06




ENVIRONMENTAL    TEST    PROCEDURE:


ELECTROMAGNETIC FIELD:        INSTRUMENTATION AND AUTOMATION EQUIPMENT INSTALLED ON
BOARD SHIPS


1. SCOPE:           Instrumentation and automation equipment installed on board
                    ships.


2. OBJECT           To demonstrate capability of correct function in environments
    OF TEST:        normally to be expected on board ships.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    -       Det Norske Veritas, Certification Notes No. 2.4, Type
                            Approval of Instrumentation and Automation Equipment;
                            D.12.2 Radiated susceptibility test.

                    Other    related   documents     are:

                    -       IEC 801-1, General introduction.
                    -       IEC 801-3, Radiated electromagnetic field requirements.
                    -       SS 436 15 23, Immunity to radio frequency electromagnetic
                            fields.
                    -       DS 5106, Immunity to radio frequency electromagnetic
                            fields.


4. TEST             A shielded enclosure of adequate size in order to prevent
   EQUIPMENT:       emission to the surroundings. The shielded enclosure should
                    preferably be equipped with absorbers to reduce reflections. A
                    signal generator, broadband power amplifiers and antennas
                    capable to create the required fields on the test object. A
                    field strength meter to control the field strength.


5. PROCEDURE:       1)      A functional test at normal ambient conditions is carried
                            out before exposure to the field.

                    2)      The test object is placed in a shielded enclosure with its
                            most sensitive side facing the radiating antenna. If doubt
                            exists regarding the most sensitive side, all six faces
                            may be presented to the antenna if this is considered
                            necessary.




                                             - 143    -
                                              E302


                  3)   The test object shall be placed on a wooden table to pre-
                       vent metallic contact between housing and the shielded
                       enslosure. However, grounding of the housing or case of
                       the test object is to be carried out in accordance with
                       the manufacturer's installation procedure.

                  4)   The test object shall then be exposed to electromagnetic
                       radiation of prescribed severity within the frequency
                       range 30 kHz - 200 MHz while correct function is checked
                       continuously. If the exposure is performed at discrete
                       frequencies, the steps shall be less than or equal to 1%
                       of the frequency.

                  5)   When disturbances occur the frequency and the field
                       strength is recorded.


6. SEVERITY:      Field strength :         10 V/m
                  Frequency range:         30 kHz - 200 MHz

7. ADDITIONAL     Before   testing   the   following   details   shall   be   specified:
    INFORMATION
    REQUIRED:     -    Functional tests and states before/during/after exposure.
                  -    Peripheral units and cables attached, and their physical
                       arrangements.
                  -    Covers and access panels to be in place or not.


8. REPORT:        A test   report shall be prepared, containing at least:

                  -    Identification of equipment tested, test facilities                 used,
                       and date of test.
                  -    Description of physical set-up (photos).
                  -    Definition and results of functional checks.
                  -    Signatures of responsible test engineers.




                                           - 144 -
                                                                     NT ELEC E303
nordtest method                                                      Approved 1990-06




ENVIRONMENTAL   TEST     PROCEDURE:


ELECTROMAGNETIC FIELD: ELECTRICAL EQUIPMENT INSTALLED OUTDOORS


1. SCOPE:          This procedure applies to electrical equipment installed out-
                   doors with no special protection against electromagnetic
                   radiation. Small handhold or vehicle installed transceivers may
                   be close to it. Examples are electronic kWh-meters, traffic
                   control, petrol pumps, etc.


2. OBJECT          To demonstrate capability of correct function during exposure
    OF TEST:       to high electromagnetic field of frequencies in common use.


3. RELATED             T h e test is performed according to:
   DOCUMENTS:
                   -        IEC 801-3, Radiated electromagnetic field requirements.

                   Other     related   documents:

                   -       IEC   801-1,   General   introduction.


4. TEST            A shielded room in order to prevent emissions to the sur-
   EQUIPMENT:      rounding. A signal generator, an amplifier, and antennas
                   capable of creating fields on the test object of the test
                   severity level. A field strength meter to control the field
                   strength.


5.   PROCEDURE:    1)      A functional test is performed before exposure.

                   2)      The test object is placed on an insulated table and
                           electrically connected according to the installation
                           instruction.

                   3)      The test object shall be running in a functional mode.

                   4)      It shall then be exposed to electromagnetic radiation of
                           prescribed severity with the frequency changing from
                           27-1000 MHz while correct function is checked con-
                           tinuously.

                   5)      When disturbances occur the frequency is recorded.

                  6)       The test is repeated for each function mode.




                                             - 145 -
                                        E303


6. SEVERITY:      Level 3
                  Field strength :    10 V/m
                  Frequency range:   27-1000 MHz


7. ADDITIONAL     The performance test during exposure has to be carefully pre-
    INFORMATION   pared in order not to change the electromagnetic environment.
   REQUIRED:

8. REPORT:        A test report shall be prepared, containing at least:

                  -    Identification of equipment tested, test facilities used,
                       and date of test.
                  -    Description of physical set-up (photos).
                  -    Definition and results of functional checks.
                  -    Signatures of responsible test engineers.




                                     - 146   -
                                                                     NT ELEC E304
nordtest method                                                      Approved 1990-06




ENVIRONMENTAL    TEST    PROCEDURE:


ELECTROMAGNETIC FIELD: IMMUNITY OF ELECTRONIC MEASURING EQUIPMENT


1. SCOPE:           Type approval test on electronic measuring instruments used for
                    trade purpose. This procedure is directly applicable to elec-
                    tronic non-automatic weighing equipment which are subject to
                    official metrological control.


2. OBJECT           To verify that electromagnetic fields from close radio transmit-
   OF TEST:         ters do not influence the accuracy of the instrument or that
                    built-in functions act to prevent faulty readings.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    -       IEC 801-3, Radiated electromagnetic field requirements.

                    Other    related   documents     are:

                    -       OIML R 76-1, Non-automatic weighing instruments. Part 1:
                            Metrological and technical requirements tests.
                    -       IEC 801-1, Electromagnetic compatibility. General intro-
                            duction.
                    -       MIL-STD 462, Electromagnetic interference characteristics,
                            measurement of (long-wire antenna method).


4. TEST             A shielded room in order to prevent emission to the surround-
    EQUIPMENT:      ings. Anechoic damping is preferable. Signal generators, ampli-
                    fiers, and antennas able to create the required field at, at
                    least, a distance of 1 m from the antennas. For frequencies
                    lower than 25 MHz a stripline circuit is normally used. How-
                    ever, for large objects it may be more convenient with the
                    long-wire antenna method.


5. PROCEDURE: 1)            The test set-up is made in such a way that the test object
                            and at least 1 m of all cables to and from the test object
                            are exposed to the field. The most sensitive side of the
                            test object shall be faced on the antenna.

                    2)      Initial measurement with no field exposure according to an
                            approved test scheme specific for the test object.




                                             - 147     -
                                                E304


                     3)   With a constant measurement parameter the field is turned
                          on and the frequency is swept slowly. The indication is
                          continuously controlled during the test. All indication
                          changes are noted together with the actual frequency.

                     4)   The test is repeated with different polarities. The polar-
                          ization shall be vertical for frequencies lower than
                          25 MHz and both vertical and horizontal for higher fre-
                          quencies. Above 200 MHz circular polarization is normally
                          used.

                     5)   Final   measurement   with       no   field   exposure.


    6. SEVERITY:     Field strength :     0.1-500 MHz : 3 V/m
                                          500-1000 MHz: 1 V/m
                     Modulation      :    1 kHz, 50% AH, square wave

    7. ADDITIONAL    If the test object has delayed indication the sweep time may be
       INFORMATION   prolonged in order to be able to detect influences.
       REQUIRED:
.                    If installation shall be done with special grounding arrange-
                     ments this shall also be done in the test set-up.


    8. REPORT:       A test report shall be prepared, containing at least:

                     -    Identification of equipment tested, test facilities used,
                          and date of test.
                     -    Description of physical set-up (drawings or photos).
                     -    Result of the functional tests.
                     -    Signatures of responsible test engineers.




                                           - 148       -
                                                                       NT ELEC E401
nordtes;t method                                                       Approved 1990-06




ENVIRONMENTAL    TEST    PROCEDURE:


ELECROSTATIC DISCHARGE: EQUIPMENT FOR DESKTOP USE IN OFFICES, HOMES, AND
LABORATORIES


1. SCOPE:           This procedure applies to electrical equipment for free
                    standing desktop use in offices, homes, and laboratories. The
                    equipment is occasionally switched of and moved for use in dif-
                    ferent locations. It is transported by carrying or on a instru-
                    ment trolley or equivalent. Operating personal have taken no
                    precautions in order to avoid electrostatic charging.


2. OBJECT           To verify that electrostatic discharge occurring on the equip-
    OF TEST:        ment or in its vicinity does not affect its performance or
                    causes malfunction or permanent damage. It is also a test of
                    proper grounding and shielding inside the equipment.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    l       IEC 801-2, Electrostatic discharge requirements.

                    Other    related   documents   are:

                    l       IEC   801-1,   General     Introduction.


4. TEST             A test generator with characteristic parameters described in
   EQUIPMENT:       IEC 801-2.


5. PROCEDURE:       1)      A functional test is performed before exposure.

                    2)      The test object is placed on an insulated support 0.1 m
                            above an earth reference plane and shall be running in a
                            function mode.

                    3)      The test generator, charged to the specified voltage shall
                            be approached to points on the test object normally
                            accessible to the operator.

                    4)      Ten discharges shall be applied on each preselected point.

                    5)      The test shall be repeated for each functional mode.


6. SEVERITY:        Level 3: 8 kV.




                                             - 149 -
                                            E401


7. ADDITIONAL    Before    testing, the    following   details   shall   be   specified:
   INFORMATION
   REQUIRED:         -    An exploratory test with reduced severity should be made
                          before applying full level in order to prevent unnecessary
                          damage on the equipment. This test could be used to
                          establish the preselected test points.
                     -    Equipment with earth terminal shall be tested both with
                          and without the earth connected to the mains earth.


8. REPORT:       A test report shall be prepared, containing at least:

                 -       Identification of equipment tested, test facilities used,
                         and date of test.
                 -       Specification of test set-up and the chosen selected
                         points.
                 -       Result of the functional tests.
                 -       Signatures of responsible test engineers.




                                          - 150 -
                                                                            NT ELEC E402
nordtest method                                                             Approved 1990-06




ENVIRONMENTAL    TEST    PROCEDURE:


ELECTROSTATIC DISCHARGE: MICROPROCESSOR CONTROLLED MEASURING EQUIPMENT


1. SCOPE:           Microprocessor controlled measuring equipment used in trade and
                    industry. The locations have central heating with no humidity
                    control. Synthetic fibres clothes and plastics are present in
                    the locations. Examples of equipment are electronic weighing
                    machines, cash registers, alarm equipment, computers, and
                    substations used outside conditioned computer rooms etc.


2. OBJECT           To verify that     electrostatic discharge occurring on the equip-
   OF TEST:         ment or in its     vicinity by charged persons does not affect its
                    performance or     causes malfunction or permanent damage. It is
                    also a test of     proper grounding and shieldings of the equip-
                    ment.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    l       IEC   801-2,   Electrostatic   discharge   requirements.

                    Other    related   documents   are:

                    l
                            IEC TC65 doc. 65(Secr)136      801-2, Revision, Electrostatic
                            discharge  requirements.


4. TEST             A test generator with characteristic parameters described in
   EQUIPMENT:       the related documents. In order to get a realistic and reprodu-
                    cible discharge the revised discharged circuit with a 330 Ω
                    series resistance and a tip relay should be used when applying
                    discharges to conductive parts.


5. PROCEDURE:       1)      The test object is placed on an insulating support 0.1 m
                            from an earth reference plane and installed in accordance
                            with the manufacturer's instructions. The power cables,
                            safety earth cables and interconnecting cables in electro-
                            nic systems shall be installed at the same distance (0.1 m)
                            from the reference earth plane, otherwise only the safety
                            earth in the power cord may be used.

                    2)      A functional test is performed. Performance requirements
                            shall be decided.




                                             -   151 -
                                            E402


                      3)   By the judgement of the test engineer operator accessible
                           points are selected if not specified in the relevant
                           specification.

                  4)       The test generator is connected to the reference plane. It
                           is charged to the specified voltage and the test finger is
                           applied to the selected points. Non-conducting points are
                           tested in air discharge mode, approaching the point until
                           discharge occurs. At least ten discharges with an interval
                           of at least 1 sec. at each selected points are performed.

                  5)       The performance shall be controlled during and after the
                           test.


6. SEVERITY:      6 kV in contact mode
                  8 kV in air discharge mode


7. ADDITIONAL     If not otherwise specified areas accessible     only   during   service
    INFORMATION   and repair are excluded from the test.
   REQUIRED:
                  Exploratory tests before the test may be done with reduced
                  severity.

                  Latent failure in components are normally not examined at this
                  test. They can be explored by electrical parameter measurement
                  on the components.


8. REPORT:        A-test report shall be prepared, containing at least:

                  l        Identification of equipment tested, test facilities used,
                           and date of test.
                  l        Specification of test set-up and the chosen selected
                           points.
                  l        Result of the functional tests.
                  l        Signatures of responsible test engineers.




                                         - 152   -
                                                                      NT ELEC E501
nordtest method                                                       Approved 1990-06




ENVIRONMENTAL      TEST   PROCEDURE:


POWER SUPPLY TEST, MAINS SUPPLY VARIATIONS: EQUIPMENT IN URBAN AREAS IN
INDUSTRIALIZED COUNTRIES


1.    SCOPE:          This procedure may be used for testing the normal operating
                      performance of any electronic equipment supplied from the mains
                      network in urban areas of industrialized countries. As a typi-
                      cal example electronic weighing instruments in retail business
                      can be mentioned


2. OBJECT             To verify the functional performance of the equipment when sub-
   OF TEST:           jected to the combined influence of voltage and frequency devi-
                      ating from the nominal.


3. RELATED            The test is performed according to:
   DOCUMENTS:
                      -       OIML International Document no. 11: General requirements
                              for electronic measuring instruments.

                      Other    related   documents   are:

                      -       OIML International recommendation no. 74, Draft,
                              Electronic  weighing instruments.
                      -       Danish Standard, DS 5104, Immunity of electrical equipment
                              against voltage variations and interruptions in the mains
                              network.


4.   TEST             AC power supply capable of producing the specified voltages and
     EQUIPMENT:       frequencies when loaded by the test specimen. This can be done
                      with a motor generator with variable speed. For low power
                      requirements, an audio oscillator/power amplifier can be used.
                      A solid state converter can also be used if noise and harmonics
                      are low.


5.    PROCEDURE:      The supply conditions of voltage and frequency are given below
                      by the percentage deviation from nominal values.

                      At each step a specified functional test is carried out after a
                      period to achieve temperature stability with the supply con-
                      dition stated.




                                               - 153 -
                                             E501


6. SEVERITY:     1)   Nominal   frequency,     nominal    voltage.

                 2)   Nominal   frequency,     voltage:   -15%.

                 3)   Nominal frequency, voltage: +lO%.

                 4)   Nominal   frequency,     nominal    voltage.

                 5)   Frequency:   -2% nominal voltage.

                 6)   Frequency:   +2%, nominal voltage.

                 7)   Nominal   frequency,     nominal    voltage.


6. SEVERITY:     As given in the procedure above.


7. ADDITIONAL    Before testing the following details shall be specified:
   INFORMATION
   REQUIRED:     -    Functional tests and states during the deviations.
                 -    Nominal values of voltage and frequency.
                 -    Attached peripheral units and loading.


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities   used,
                      and date of test.
                 -    Description of physical set-up.
                 -    Definition and results of functional checks.
                 -    Signatures of responsible test engineers.




                                       - 154 -
                                                                           NT ELEC E502
nordtesit method                                                           Approved  1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


POWER SUPPLY TEST, SHORT TIME MAINS REDUCTIONS:              EQUIPMENT IN URBAN AREAS IN
INDUSTRIALIZED  COUNTRIES


1. SCOPE:            This procedure may be used for testing the normal operating
                     performance of any electronic equipment supplied from the AC
                     mains network in urban areas of industrialized countries. As a
                     typical example electronic weighing instruments in retail busi-
                     ness can be mentioned. The procedure is not applicable to the
                     supply in factories or near large power consumers on weak net-
                     works, where longer periods of reductions may occur.


2. OBJECT            To verify the functional performance of the equipment when
   OF TEST:          subjected to normally occurring short time reductions in the
                     mains AC voltage.


3.    RELATED        The test is performed according to:
     DOCUMENTS:
                     -       OIML International Document no. 11: General requirements
                             for electronic measuring instruments.

                     Other    related   documents     are:

                     -       OIML International Recommendation no. 74, Draft, Electro-
                             nic weighing instruments.
                     -       Danish Standard, DS 5104, Immunity of electrical equipment
                             against voltage variations and interruptions in the mains
                             network.


4.   TEST            A special AC power supply designed for the purpose is necessary.
     EQUIPMENT:      It shall be possible to control the voltage amplitude of indi-
                     vidual half cycles while supplying the power required by the
                     test specimen.


5.   PROCEDURE:      1)      Perform a functional test with nominal supply, and monitor
                             the functional performance during the following steps.

                     2)      The amplitude of one half-cycle is reduced to 0 V. Repeat
                             this ten times, with intervals of at least 10 sec.

                    3)       The amplitude of one half-cycle is reduced to 50% of the
                             nominal. Repeat this 10 times, with intervals of at least
                             10 sec.




                                              - 155     -
                                               E502


                   4)   The amplitude of five half-cycles (2,5 cycles) are reduced
                        to 80% of the nominal. Repeat this ten times, with inter-
                        vals of at least 10 sec.

                   5)   Perform   a   functional        test.


6.   SEVERITY:     As given in the procedure above and illustrated below:




                                                                0
                                        Time   (msec)




                                                                0
                                        Time (msec)




                                                                0

                                        Time (msec)


7.   ADDITIONAL    Before   testing   the   following       details   shall   be   specified:
     INFORMATION
     REQUIRED:     -    Functional tests and monitoring during the                   reductions.
                   -    Nominal values of voltage and frequency.
                   -    Attached peripheral units and loading.


8. REPORT:         A test report shall be prepared, containing at least:

                   -    Identification of equipment tested, test facilities used,
                        and date of test.
                   -    Description of physical set-up.
                   -    Definition and results of functional checks and monitoring.
                   -    Signatures of responsible test engineers.
                                            - 156       -
                                                                                NT ELEC E503
nordtert method                                                                 Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


POWER SUPPLY TEST, DC-VOLTAGE: DETECTORS IN BURGLAR ALARM SYSTEMS


1. SCOPE:            Electronic equipment supplied from weak DC-supply systems.
                     Several units may be connected on the same line. Typical equip-
                     ment is detectors in alarm systems, transducers in process
                     control systems, terminals in local telecomminications systems,
                     etc.


2. OBJECT            To verify correct functional performance when the supply
   OF TEST:          voltage changes.


3.    RELATED        The test is performed according to:
     DOCUMENTS:
                     -       IEC 839-l-3,    Environmental    testing   for   alarm   system.
                             Test A-8.

                     Other    related   documents   are:

                     -       IEC 839-2-2, Requirements       for intruder     alarm   systems.
                             Part 2: Requirements for        detectors.


4. TEST              DC-supply capable of supplying the EUT within the prescribed
   EQUIPMENT:        voltage range. Test equipment to verify performance of the EUT.


5.   PROCEDURE:      1)      The EUT is supplied with nominal voltage. When temperature
                             stability has been reached, a performance test is made.

                     2)      The EUT is supplied with low voltage. When temperature
                             stability has been reached, a performance test is made.

                     3)      The EUT is supplied with high voltage. When temperature
                             stability has been reached, a performance test is made.


6. SEVERITY:         Nominal voltage (normally 12 V): +25%, -15%.


7. ADDITIONAL        -       The performance requirements shall be stated before the
   INFORMATION               test.
   REQUIRED:




                                              - 157 -
                                   E503


8. REPORT:   A test report shall be prepared, containing at least:

             -   Identification of equipment tested, test facilities   used,
                 and date of test.
             -   Result of the performance tests.
             -   Signatures of responsible test engineers.




                                - 158   -
                                                                     NT ELEC E504
nordtest method                                                      Approved 1990-06




ENVIRONMENTAL    TEST    PROCEDURE:


POWER SUPPLY TEST, AC-SUPPLY: EQUIPMENT INSTALLED ON SHIPS WITH 220 V AC MAINS
NETWORK


1. SCOPE:           This procedure may be used for equipment installed on board
                    ships having a mains network of nominally 220 V, 50 Hz or
                    60 Hz. Stationary and transient deviations in the supply are to
                    be expected due to the combined effects of the loading of the
                    power generator and the distribution lines.


2. OBJECT           To demonstrate a capability of correct function before/during/
   OF TEST:         after power deviations. The total transients of higher peak
                    values caused by switching off loads are not considered in this
                    procedure, neither are transients produced, when the generator
                    protective equipment breaks a short circuit of a generator.
                    RF noise is not considered.


3. RELATED          The test is performed according to:
   DOCUMENTS:
                    l       Det norske Veritas, Certification Notes No. 2.4, Type
                            Approval of Instrumentation and Automation Equipment;
                            D.5.1 Electric power supply AC.

                    Other    related   documents   are:

                    l       Danish Standard 5104, Immunity of electrical equipment
                            against voltage variations and interruptions in the mains
                            network.


4 . TEST            -       Power supply with the following minimum characteristics:
    EQUIPMENT:              Voltage :    176-264 V AC
                            Frequency:   42-69 Hz
                    -       Voltmeter.
                    -       Frequency meter.


5 . PROCEDURE:      1)      The test specimen is to be fed by normal power supply and
                            is to be in operation under normal load unless otherwise
                            stated in the relevant test program.

                    2)      A functional test at normal ambient conditions is carried
                            out prior to the exposure.




                                             - 159 -
                                                     E504


                  3)       The equilibrium state is to be reached before any de-
                           viation is applied. The test according to TABLE 1 is then
                           carried out.

                  4)       After completion of the deviation test, power supply break
                           test is to be carried out.

                  5)       Finally, a functional test is carried out.


6.   SEVERITY:    Voltage and frequency deviations according to TABLE 1 below.
                  The deviations and transients are given in percent of nominal
                  parameters.

                  TABLE 1       Voltage    and    frequency    deviations.



                      COMBINATION   VOLTAGE        FREQUENCY       VOLTAGE          FREQUENCY       TIME
                      NO.           DEVIATION      DEVIATION       TRANSIENT        TRANSIENT
                                          %            %              %                %

                           1              +lO          +5                 0                0        15 min.

                           2              -15          -5               0                  0        15 min.

                           3               +10         -5               0                  0        15 min.
                          4                   0        0             +20              +15            2 sec.

                           5               0            0            -20              -15            2 sec.
                                                               I               I



                  Power supply breaks:
                  Three times within 5 min. Break time: 30 sec. unless otherwise
                  stated in the relevant test program.


7. ADDITIONAL     Before       testing     the    following        details         shall       be   specified:
    INFORMATION
   REQUIRED:      -        Functional  tests  before/during/after                              exposure.
                  -        Nominal voltage and frequency.


8. REPORT:        A test report shall be prepared, containing at least:

                  -        Identification of equipment tested, test facilities                                   used,
                           and date of test.
                  -        Results of functional tests.
                  -        Compliance with this document.
                  -        Signatures of responsible test engineers.




                                                   - 160 -
                                            NT ELEC
nordtest method                             Approved 1990-06




     5.4   Miscellaneous   Procedures




                                  - 161 -
                                                                     NT ELEC Xl01
nordtest method                                                      Approved 1990-06




ENVIRONMENTAL    TEST    PROCEDURE:


SALT MIST, CYCLIC: INDOOR INSTALLATIONS ON SHIP AND OFF-SHORE APPLICATIONS


1. SCOPE:           Equipment installed on ships, boats off-shore platforms, and
                    other sea environment. Conditions which are protected from
                    direct water sources as rain and waves but will be exposed to
                    salt mist through doors or the ventilation.

                    The test specimen can be a complete electrical device or repre-
                    sentative samples of the parts and platings used in a device.
                    The test can also be used for pure material testing.


2. OBJECT           To determine the suitability of a component or an equipment for
   OF TEST:         use or exposure in a salt-laden atmosphere. To demonstrate the
                    corrosive effects in metallic materials and to indicate de-
                    terioration of some non-metallic materials by assimilation of
                    salts.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    -       IEC 68-2-52, Test Kc (1984), Salt mist cyclic (sodium
                            chloride  solution).
                    -       IEC 68-2-3, Test Ca (1969), Damp heat, steady state.

                    Other    related   documents    are:

                    -       IEC   721-3-6,   Ship   environment.


4. TEST             The salt mist chamber, the atomizer and the air supply shall
   EQUIPMENT:       fulfil the requirements in IEC 68-2-52. The humidity chamber
                    shall conform to the requirements of IEC 68-2-3.


5. PROCEDURE:       The specimen is not energized during the spraying period or the
                    storage period.

                    1)      A functional test is performed before exposure to the
                            first spraying period.

                    2)      The door of the cabinet of the specimen and all inlets
                            that will be closed in normal operation shall be closed.




                                              - 163 -
                                       X101


                 3)   Possible dirt, oil or temporary protective coatings   shall
                      be removed from the outer surface of the specimen.

                 4)   The specimen shall be exposed to the consecutive spray and
                      storage periods as specified in CLAUSE 6. Note that a
                      sufficient pre-heating will be provided at the beginning
                      of the storage period.

                 5)   After the final cycle waterproof specimens shall be washed
                      as described in IEC 68-2-52. Non-waterproof specimen shall
                      be wiped with a damp cloth.

                 6)   The specimen shall be visually examined and all corrosion
                      effects should be recorded.

                 7)   A functional test is performed. However, correct operation
                      is not required if a malfunction is caused by accumulated
                      salt solution on electrical circuits.


6. SEVERITY:     Salt spray period: 2 h
                 Salt solution :    5% sodium      chloride
                 Temperature of
                 salt mist chamber: 35°C, 2°C

                 Storage period :    20-22 h
                 Temperature of
                 humidity chamber :  4O°C, 2°C
                 RH of humidity
                 chamber           :  93% +2/-3%
                 Total duration : 3x24h
                 (IEC severity)


7. ADDITIONAL    Method of assessment of the degree of corrosion. Some methods
   INFORMATION   may require a scratch to be made on painted surfaces.
   REQUIRED:


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities used,
                      and date of test.
                 -    Description of physical set-up in the tank (photo).
                 -    Definition and results of functional checks and visual
                      inspections.
                 -    Signature of responsible test engineers.




                                     - 164 -
                                                                      NT ELEC X102
 nordtest method                                                      Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


SALT MIST, CYCLIC: EQUIPMENT INSTALLED OUTDOOR ON SHIP, HARBOUR, ROADSIDE


1.    SCOPE:         This procedure applies to equipment permanently installed
                     where it is subjected to salt mist or direct saltwater
                     spraying, without external protection. It could typically
                     be equipment mounted on ships, in harbours or c lose to
                     roadsides.


2. OBJECT            To determine possible adverse effects on equipments and
   OF TEST:          materials due to exposure to a salt-laden atmosphere.
                     Metallic materials may corrode and some non-metallic
                     materials may fail due to assimilation of salts. The test
                     may be carried out on representative parts of an equipment.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     -       IEC 68-2-52, Test Kb, Salt mist, cyclic (sodium cloride
                             solution).

                     Other    related   documents   are:

                     -       IEC 68-2-3, Test Ca, Damp heat, steady state.
                     -       IEC 721-3-6, Ship environment.


4. TEST              Two chambers are required for this test, one chamber in accord-
     EQUIPMENT:      ance with IEC 68-2-52 for generating the 5% sodium cloride
                     solution, and one chamber in accordance with IEC 68-2-3 for
                     each subsequent storage period.


5.   PROCEDURE:     The test specimen is not energized during the spraying periods,
                    and not normally during the storage periods.

                     1)      Initial mechanical preparations and electrical measure-
                             ments are carried out as required.

                    2)       The specimen is placed in the salt chamber, where it is
                             exposed to the 5% sodium cloride solution for 2 h, at a
                             temperature between 15°C and 35°C.

                    3)       The test specimen is moved from the salt chamber to a
                             humidity chamber, with minimum loss of salt solution from
                             the specimen surfaces.




                                              - 165 -
                                               X102


                  4)       The specimen is now stored under conditions of damp heat,
                           steady state, 40°C, 93% RH, for the specified time.

                  5)   Steps 3) and 4) constitute one exposure cycle, and these
                       steps are repeated the number of times specified, by
                       moving the specimen back to the salt chamber.

                  6)   After the final cycle, a visual inspection shall be car-
                       ried out, describing accumulated salt, corrosion effects,
                       etc.

                  7)   If relevant, and allowed, the specimen shall be cleaned
                       and checked electrically.


6. SEVERITY:      Severity 1, according to IEC 68-2-52:

                  Duration of each storage period:            7 days
                  Number of cycles                :            4


7. ADDITIONAL     Before    testing   the   following   details   shall   be   specified:
    INFORMATION
   REQUIRED:      l    Functional tests before/after exposure.
                  l    Initial and final cleaning methods if relevant.
                  l    Covers or lids to be open or closed during exposure.


8. REPORT:        A test report shall be prepared, containing at least:

                  l    Identification of equipment tested, test facilities used,
                       and date of test.
                  l    Description of physical set-up in chambers (photos).
                  l    Results of visual inspections and functional checks.
                  l    Signatures of responsible test engineers.




                                            - 166   -
                                                                     NT ELEC X201
nordtest method                                                      Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


WATER TEST, ENCLOSURE: IMMERSIBLE PROOF PORTABLE ELECTRONIC EQUIPMENT


1. SCOPE:            This procedure may be used for testing of any hand-portable
                     equipment, such as for instance walkie-talkies or pager devi-
                     ces, which are required to survive immersion in water.


2. OBJECT            To verify that ingress of water in a harmful quantity is not
   OF TEST:          due to immersion. The test will also indicate the protection
                     against spraying water.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     -      IEC 529, Classification of degrees of protection provided
                            by enclosures.


4. TEST              Freshwater tank, deep enough to accommodate   the specified depth
   EQUIPMENT:        of immersion.


5.   PROCEDURE:      1)     The test specimen and the freshwater in the tank shall
                            both be at normal ambient temperature conditions for
                            testing, and their temperatures shall not deviate by more
                            than 5°C.

                     2)     A functional test is performed.

                     3)     The specimen is laid freely on a flat, horizontal sup-
                            porting surface. In this position the specimen is secured
                            to the surface, which is then lowered to the specified
                            depth of immersion.

                     4)     After the specified duration, the specimen is taken out of
                            the water and dried with a cloth on the outside.

                     5)     A functional test is performed.

                     6)     The specimen is opened for a visual inspection. Any ob-
                            served water shall be described.




                                           -   167 -
                                               X201


    6.   SEVERITY:     X7: Protected against the effect of immersion.

                       Depth of inrnersion: 1 m
                       Duration : 30 min.


    7.    ADDITIONAL   Before testing the following details shall be specified:
         INFORMATION
         REQUIRED:     -    Functional tests before/after the exposure.
                       -    Condition of enclosure, tightening of bolts.
                       -    Visual   inspection, opening/dismantling of the   specimen,
                            use of fluorescent dye in water.


    8. REPORT:         A test report shall be prepared, containing at least:              l




                       -    Identification of equipment tested, test facilities used,
                            and date of test.
                       -    Description of physical set-up in the tank (photo).
                       -    Definition and results of functional checks and visual
                            inspections.
                       -    Siqnature of resoonsible test engineers.
.




                                             - 168 -
                                                                          NT ELEC X202
                                                                          Approved  1990-06
nordtest method


ENVIRONMENTAL     TEST        PROCEDURE:


WATER TEST, WATER JETS: GENERAL WATER TIGHTNESS TEST FOR ENCLOSURES AND
EQUIPMENT


1. SCOPE:            Enclosures or equipment to be used in condition of massive splash-
                     ing water, solid water spray or moderate jets from water hoses.


2. OBJECT            To determine the degree of protection of an equipment inside
   OF TEST:          the enclosure against harmful ingress of water. This particular
                     procedure determines the degree of protection according to
                     Class IP X5.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                         -      IEC 529, Classification of degrees of protection provided
                                by enclosures.

                     Other related documents are:
                         -       IEC 721-3-4, Stationary use at non-weather-protected loca-
                                tions, Class 428.
                                                             .

1. TEST              A water hose with standard test nozzle and pressure meter as
   EQUIPMENT:        specified in IEC 529. A rotating table for supporting the test
                     item is an auxiliary device.


5.   PROCEDURE:      The specimen is not energized during the test and it is exposed
                     to the test in normal operating position.
                     1) The test is carried out by spraying the enclosure from all
                          practical directions (which are usually six faces) and
                          directing the jets especially towards critical parts like
                          the sealing, the lock and cable inlets.

                         2)      After spraying the item is dried externally either by
                                 wiping or using pressurized air carefully enough not t o
                                 force water droplets to pass the sealings.

                         3)      The enclosure is opened avoiding to turn the item from the
                                 vertical position. Visual examination is carried out for
                                 detecting leakage. The amount of leakage (droplets) and
                                 the suspected position of leakage shall be recorded.




                                                - 169 -
                                        x202


                  4)   For class IP X5 few droplets are accepted on the inner
                       surface of the enclosure, if they have no possible access
                       to electrical parts. If the item is provided with drain
                       holes, water is allowed on the bottom if it will not
                       interfere with satisfactory operation.

                  5)   The operation is checked before removing any of the water
                       in a case where the degree of interference has to be
                       assessed.


6. SEVERITY:      Nozzle inner diameter : 6.3 mm
                  Delivery rate : 12 l/min. +5%
                  Water pressure : 30 kN/m3 (0.3 bar)
                  Test duration : 1 min./m2 or 3 min. minimum
                  Distance from nozzle : 3 m


7. ADDITIONAL     For some devices that are continuously operated in outdoor con-
    INFORMATION   ditions it might be necessary to specify inspection of opera-
    REQUIRED:     tion during the spraying period.


8. REPORT:        A test report shall be prepared, containing at least:

                  -    Identification of equipment tested, test facilities used,
                       and date of test.
                  -    Mounting of specimen and description of physical set-up
                       (photo).
                  -    Results of functional checks, intermediate measurements,
                       and visual inspections.
                  -    Signature of responsible test engineers.




                                      - 170 -
                                                                               NT ELEC X203
nordtest method                                                                Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


WATER TEST, FALLING DROPS: CONTROL UNITS AND MONITORING UNITS, NOT HUMIDITY
CONTROLLED INDOOR LOCATIONS


1. SCOPE:            This procedure applies to equipment such as control units and
                     monitoring units used stationary in weather-protected loca-
                     tions, where neither temperature nor humidity are controlled,
                     for instance ordinary storage rooms, certain cellars, workshops
                     with processed producing high humidity. Installed products may
                     be subjected to falling drops from condensation or leakage from
                     upper surfaces.


2. OBJECT            To verify the ability of covers and sealings to retain equip-
   OF TEST:          ment functional under a water dropfield.


3. RELATED           The test is performed according to:
   DOCUMENTS:
                     l       IEC 68-2-18, Test R and guidance: Water, method RA2: Drip
                             box.

                     Other    related   documents   are:

                     l       IEC 721-3-3,    Stationary    use   at   weather-protected   loca-
                             tions.


4. TEST              Drip box, with sufficient base area and capacity to maintain a
   EQUIPMENT:        uniform dropfield with a precipitation intensity of 200 mm/h to
                     300 m m / h and also to fulfil the other requirements mentioned
                     in IEC 68-2-18.


5.   PROCEDURE:      1)      A visual examination and a functiona1 test is performed at
                             standard atmospheric conditions.

                     2)      The specimen is mounted on an appropiate fixture placed
                             under the drip box. The fixture shall simulate as far as
                             possible the mounting structure to be used in the real use
                             of the specimen.

                     3)      The specimen is subjected to vertically falling drops of
                             water for the time specified. The specimen shall be
                             operated during exposure and required intermediate measur-
                             ments are carried out.




                                              - 171   -
                                          X203


                 4)   After the exposure the specimen shall be examined for
                      excessive ingress of water and a functional test shall be
                      carried out.


6. SEVERITY:     Drop falling height: 2 m
                 Tilt angle        :   0°
                 Duration          :   30 min.


7. ADDITIONAL    Before testing the following details shall be specified:
   INFORMATION
   REQUIRED:     -    Functional   tests   before/during/after exposure.
                 -    Intermediate    measurements.
                 -    Covers or lids to be opened or closed if relevant.


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities          used,
                      and date of test.
                 -    Mounting of specimen.
                 -    Description of physical set-up under the drip box (photo).
                 -    Results of functional checks, intermediate measurements,
                      and visual inspections.
                 -    Signature of responsible test engineers.




                                      - 172 -
                                                                     NT ELEC X401
nordtest method                                                      Approved 1990-06




ENVIRONMENTAL    TEST    PROCEDURE:


CORROSIVE ATMOSPHERES, SULPHUR DIOXIDE: EQUIPMENT OUTDOORS IN POLLUTED, MOIST
ENVIRONMENT


1. SCOPE:           Equipment for installation and use in polluted and moist
                    environmental condition. The test specimen can be a complete
                    electrical device or a part like a contact or aconnector.


2. OBJECT           To determine the suitability of a component or an equipment for
   OF TEST:         use or exposure in highly polluted moist atmosphere.


3. RELATED          The test is performed according to:
    DOCUMENTS:
                    -       ISO/TC 156 WG 7 N 38, method A.

                    Other    related   documents   are:

                    -       IEC 721-3-4, Stationary use at non-weather-protected loca-
                            tions.

4. TEST             The test chamber shall be made of a material that resists
   EQUIPMENT:       corrosion and which does not absorb the gas used. No conden-
                    sation is allowed in the test chamber. Dry gas and damp air
                    shall be mixed into the test chamber through a diffuser.
                    Sampling of the gas shall be done in the inlet after the dif-
                    fuser and shall be performed continuously during the test. The
                    atmosphere in the chamber shall be replaced 3 times/h.


5. PROCEDURE:       1)      Dirt and grease shall be removed from uncovered metal
                            surfaces.

                    2)      A functional test is performed before the exposure.

                   3)       The specimen shall be energized and in normal status
                            (doors, inlets, etc. in operating position) during expo-
                            sure.

                   4)       After exposure a functional test is performed and the spe-
                            cimen shall be visually examined for all corrosion effects.




                                             - 173 -
                                        X401


6. SEVERITY:     Temperature :       25°C   ±2°C
                 Humidity            75% RH ±3%
                 Sulphur dioxide:    1 ppm ±0.2 ppm
                 Duration        :   21 days


7. ADDITIONAL    The method of cleaning surfaces shall be suitable for the
   INFORMATION    materials involved.
   REQUIRED:


8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities used,
                      and date of test.
                 -    Description of sample preparation and position in test
                      chamber.
                 -    Definition and results of functional checks and visual
                      inspections.
                 -    Signatures of responsible test engineers.




                                     - 174 -
                                                                        NT ELEC X402
nordtest method                                                         Approved 1990-06




ENVIRONMENTAL      TEST      PROCEDURE:


CORROSIVE ATMOSPHERES, SULPHUR DIOXIDE AND HYDROGEN SULPHIDE: EQUIPMENT
OUTDOORS IN POLLUTED, MOIST ENVIRONMENT


1. SCOPE:               Equipment for installation and use in polluted and moist
                        environmental condition. The test specimen can be a complete
                        electrical device or a part ike a contact or a connector.


2. OBJECT              To determine the suitability of a component or an equipment for
    OF TEST:           use or exposure in highly po luted moist atmosphere.


3. RELATED             The test is performed according to:
    DOCUMENTS:
                        -      ISO/TC 156 WG 7 N 38, method C.

                       Other    related   documents:

                       -       IEC 721-3-4, Stationary use at non-weather-protected loca-
                               tions.


4. TEST                The test chamber shall be made of a material that resists corro-
   EQUIPMENT:          sion and which does not absorb the gases used. No condensation
                       is allowed in the test chamber. Dry gases and damp air shall
                       be mixed into the test chamber through a diffuser. Sampling of
                       the gasses shall be done in the inlet after the diffuser and
                       shall be possible to perform continuously during the test. The
                       atmosphere in the chamber shall be replaced 3 times/h.


5 . P R O C E D U R E : 1)     Dirt and grease shall be removed from uncovered metal sur-
                               faces.

                       2)      A functional test is performed before the exposure.

                       3)      The specimen shall be energized and in normal status
                               (doors, inlets, etc. in operating position) during expo-
                               sure.

                       4)      After exposure a functional test is performed and the spe-
                               cimen shall be visually examined for all corrosion effects.




                                               - 175 -
                                         X402


6. SEVERITY:    Temperature        :    25°C ±2°C
                Humidity           :    75% RH ±3%
                Sulphur dioxide :        1 ppm ±0.2 ppm
                Hydrogen  sulphide:     0.5 ppm ± O.l ppm
                Duration           :    21 days


7. ADDITIONAL  The method of cleaning surfaces shall be suitable for the
   INFORMATION materials involved.
   REQUIRED:


8. REPORT:      A test report shall be prepared, containing at least:

                -    Identification of equipment tested, test facilities used,
                     and date of test.
                -    Description of sample preparation and position in test
                     chamber.
                -    Definition and results of functional checks and visual
                     inspections.
                -    Signatures of responsible test engineers.




                                       - 176 -
                                                                      NT ELEC X403
nordtest method                                                       Approved 1990-06




ENVIRONMENTAL     TEST    PROCEDURE:


CORROSIVE ATMOSPHERES, HYDROGEN SULPHIDE: INSTALLATIONS IN CLEAN ENVIRONMENT


1. SCOPE:            Equipment for installation and use in clean areas as aircon-
                     ditioned areas. The test specimen can be a complete electrical
                     device or a part like a contact or a connector. Silver and
                     silver-coated objects for use in polluted and moist atmosphere
                     can also be tested by this method.


2. OBJECT            To determine the suitability of a component or an equipment for
   OF TEST:          use or exposure in clean areas or silver in polluted and moist
                     atmosphere.


3.    RELATED        The test is performed according to:
     DOCUMENTS:
                     -       IEC 68-2-43, Test Kd, Hydrogen sulphide test for contacts
                             and connectors.

                     Other    related   documents:

                     l       IEC 721-3-3, Stationary use at weather-protected loca-
                             tions.
                     l       IEC 68-2-46, Guidance to test Kd.


4. TEST              The test chamber shall be made of a material that resists
   EQUIPMENT:        corrosion and which does not absorb the gasses used. The rela-
                     tive speed between the test atmosphere and the specimen shall
                     be 6-17 mm/s and the atmosphere in the test chamber shall be
                     replaced 3-5 times/h.


5.   PROCEDURE:      1)      Dirt and grease shall be removed from uncovered metal sur-
                             faces.

                     2)      A functional test is performed before the exposure.

                     3)      The specimen shall be energized and in normal status
                             (doors, inlets, etc. in operating position) during expo-
                             sure.

                     4)      After exposure a functional test is performed and the spe-
                             cimen shall be visually examined for all corrosion effects.




                                             - 177 -
                                            x403


6. SEVERITY:     Temperature          :     25°C  ±2°C
                 Humidity             :    75% RH ± 3 %
                 Hydrogen    sulphide:     10 ppm ±15 ppm
                 Duration             :    4 days


7. ADDITIONAL    The method of cleaning surfaces shall be suitable for the
   INFORMATION   materials  involved.
   REQUIRED:

8. REPORT:       A test report shall be prepared, containing at least:

                 -    Identification of equipment tested, test facilities used,
                      and date of test.
                 -    Description of sample preparation and position in test      '
                      chamber.
                 -    Definition and results of functional checks and visual
                      inspections.
                 -    Signatures of responsible test engineers.




                                          - 178 -

				
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