740 DUAL INSTRUCTION MANUAL by greenwebapp

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740 Wrist strap + shoe tester
                                                         MO 0688-0201
 Operating Instructions                                  February, 2001




                         740
                         wrist strap + shoe tester   3
                               <           o.k.      >
                     1                         2




MO 0688-0201                                                          1 / 11
                                             740
                                          wrist strap + shoe tester                      3
                     LED for
                                                                                                                               LED for
              «too low resistance»                 <                 o.k.                >                              «too high resistance»
                                         1                                  2


              Ground cord                                                                                                    Contact plate
              4 mm stud                                                                                                      for shoe test



          Contact plate for
          wrist strap test
                                                                MΩ              MΩ                                             On / Off switch
                                                            2   -                - 10
                                                            5   -                - 35
                                                           10   -                - 50
                                                           35   -                - 100
                                                                                             on / off
                  Socket for                      Output
                                                                     R
                  wrist strap                                         max                         DC 24•30 V / 150 mA

                                                                                                    +            -


                 Ground Socket                                                                                             Connection for AC/DC
                                                                                                                           transformer
         Output signal for external devices
                                                           LED       Upper limit         Socket for
         e.g. - data transfer to PC, electrical door
         opening system, acoustic signal, etc.                       selection for wrist shoe electrode
                                                                     strap and shoe test




I. General                                                                  II. Declaration of Conformity
Personnel grounding devices such as wrist straps                            The 740 Wrist Strap and Shoe Tester is in
and conductive footwear are the primary method                              conformity with the regulations of the EMC-
to minimise charge generation on the human                                  directive 89/336/EWG. The following standards
body. They must be able to drain this charge as                             have been taken into account while designing and
rapidly as it is generated.                                                 manufacturing the instrument: EN 60204-1/85,
                                                                            EN 60204-1/91, EN 61010 (Safety),
For this reason, it is important to test wrist straps
                                                                            EN 50082-1/92 and EN 50082-2/92.
and conductive footwear on a regular basis to
ensure they are functioning properly and that the
test results can be recorded




2 / 11                                                                                                                                           MO 0688-0201
III. Description                                       IV. Operation
The 740 wrist strap and shoe tester is an electronic   Connect the AC/DC - transformer (DC 24-30 V,
test instrument which is easy to operate and           150 mA) to the 740 tester.
designed to be wall mounted. An AC/DC -                Note: If you notice a delay in the response time of
transformer is supplied. The 740 switches off          the LED illumination please connect the ground
automatically after non-use for approximately 30       cord supplied to the ground socket of the 740.
minutes.                                               Please ensure proper earth ground connection!
The unit consists of two measurement circuits
with an open circuit test voltage of 20 V for wrist
strap and shoe test applications. For wrist strap
and footwear testing, a minimum threshold
resistance of 750 kΩ is set internally. The desired
maximum allowable resistance level can be
selected separately for each measurement. If the
resistance of the tested wrist strap or footwear is
within the selected range, the green "o.k."-LED
will illuminate. The red "< " -LED alerts the
                                                     Switch the unit on. All LEDs will flash for
operator that the resistance of the tested device is
                                                     approximately 1 s to check their function. Select
under 750 kΩ. The red "> "-LED indicates that the
                                                     the desired upper maximum resistance level for
selected maximum resistance is exceeded.
                                                     both the wrist strap and shoe test by using a small
The 740 can be connected to external devices such screw driver.
as computers (for data recording), electrical door
opening systems, counter or other evaluating                            R
components.                                                               max


The 740 wrist strap and shoe tester
consists of:                                           The 741/741D shoe electrode must be connected
- 3.5" - diskette containing instruction manual and    if footwear testing is required.
  740 daily log sheet
- Base unit
- Data output connector plug
- Wall mounting kit, 3M Dual Lock™ fastening
  system and template
- Cover for wrist strap plug-in jack
- AC/DC - transformer
- Ground cord


Accessories:
- Shoe electrodes type 741 (single electrode) or
  741D (dual electrode) (to be ordered separately).




MO 0688-0201                                                                                          3 / 11
V. Wall Mounting                                         VI. Wrist Strap Test
The enclosed 3M Dual Lock™ fastening discs               Put the wrist band on with ground cord attached
must be screwed to the wall using the attached           and insert the ground cord into the wrist strap
template approximately 1500 mm (5 feet) above            plug-in jack. Depress the metal contact plate and
the floor. Drill three holes of 5mm (0.2 in)             hold it. One of the indicator-LEDs will illuminate.
diameter at marked locations. Make sure the area         An illuminated green LED indicates that the wrist
on the 740 in which the Dual Lock™ fastening             strap performs within the resistance range of
strips are placed is free of dust and dirt. Attach the   750 kΩ to the upper selected value of 2, 5, 10 or
3M Dual Lock™ fastening strips to the rear of the        35 MΩ. If a red "< "-LED is on, the current
740 tester to the bottom and top in parallel; see        limiting resistor in the ground cord is bypassed
drawing for locations.                                   and the cord has to be replaced. The red "> "-LED
For securing on the wall, press the 740 firmly           indicates that the selected resistance range is
against the discs. For removal of the 740, lift the      exceeded. Check to see if the high resistance is in
top corners with both hands.                             the cord, the wrist band or in the contact between
                                                         wrist band and the operator’s skin. To check the
                                                         resistance of the ground cord, leave the plug end
                                                         of the ground cord attached to the tester and
                                                         disconnect the snap end from the wrist band.
                                                         Connect ground cord snap to the stud in the hand
                                                         symbol or press it onto the contact plate and
                                                         depress the plate until one of the LEDs is
                                                         illuminated.



           Rear of the 740

                                                                               If the green LED illuminates
                                                                               now, the ground cord can be
                                                                               used.
                                                                               If the red "> "-LED is lit,
                                                                               replace the ground cord.
                                                         In some cases, high contact resistance between the
               Template                                  skin and wrist band will cause the tester to show a
                                                         red ">" - LED condition. This resistance may be
                                                         caused by dry skin or the presence of hair in the
                                                         wrist area. The use of a skin lotion is
                                                         recommended to solve this problem.
                                                         If a red ">"- LED condition still exists, replace the
                                                         wrist band.

                                     1 500 mm
                                      (5 feet)




4 / 11                                                                                             MO 0688-0201
VII. Shoe test                                        a) when the 741 single shoe electrode is
                                                      used:
Either the 741/741D shoe electrode must be
connected to the 740 shoe jack.                       If the red "> "-LED is illuminated, clean the soles
                                                      of the shoes or check shoe grounding system (heel
                                                      ground or toe ground strap) and retest. If, after
                                                      cleaning, the red "> "-LED remains lit, replace it
                                                      by an appropriate device. If the red "< "-LED is
                                                      illuminated, the minimum resistance of the shoes
                                                      or shoe grounding system is under 750 kΩ.
Switch the 740 on. Stand on the applied shoe          An electrical hazard to personnel may exist at the
electrode. If you are using shoe straps with a        work place.
1 MΩ - resistor on both feet to be tested with the
741 shoe electrode, you have to test the straps one
                                                      b) when the 741D dual shoe electrode is
after the other, to avoid a red "too low" -
                                                      used:
indication. Care must be taken not to put the non-
tested foot on ESD - protective flooring to avoid a   The dual shoe electrode allows differentiation
bypass to ground. Depress the metal contact plate     between the right and left shoe; giving the right
for shoe test until one of the indicator - LEDs       shoe a preference in indication. This means, if
lights up. The green LED indicates that the           both shoes or just the right one are out of range,
resistance of the person through the footwear is in   you will get identical indications as it would be
the range between 750 kΩ and the desired upper        with the single shoe electrode. If just the left shoe
maximum level (10, 35, 50 or 100 MΩ).                 is out of range, the corresponding red LED will
                                                      flash. Consequently, in case of a steadily lit red
                                                      LED, you shall clean or remove right shoe first
                                                      and retest. If the right shoe is in the "ok"-range
                                                      then, you will obtain information about
                                                      performance of the left shoe and you can react
                                                      accordingly.
                                                      The shoe test does not influence the wrist strap
                                                      test, therefore the shoes can be tested while the
                                                      wrist strap is still connected to the 740 or the wrist
                                                      strap can be tested while the operator is standing
                                                      on the 741 shoe electrode. Both metal plates shall
                                                      not be pressed at the same time.




MO 0688-0201                                                                                            5 / 11
VIII. Data Output Connector
If you are going to use the data output connector you must follow a test sequence. It must be wrist strap
test first and then the shoe test. If this sequence is not strictly kept, the output at the pins described
on page 7 will be mixed up.
The 740 will provide digital signals (high/low) while testing the personnel grounding devices. These
digital signals can be used for data recording (Example 1) and authorisation control equipment such as
electrical door opening systems (Example 2). The output of the 740 will give you permanently + 5 V at
pin 3 and DC-return at pin 6. The remaining pins 1, 2, 4 and 5 (open collector) will be high
(max. + 30 V/20 mA have to be provided externally) or low (DC-return) while pressing on the contact
plates either for wrist strap or shoe tests. The chart on page 7 shows all of the possible test results and
the corresponding output levels.



Example 1: Output connection for use                   Example 2: Output connection for use
with a computer                                        with a controlling device




                                                                                          Relay
                                                                                                            External
                        Pin 3
                                                                                    I max. 20 mA
                                                                                                            voltage
                 + 5V
 Output                                               Output                                                source
                          5 kΩ
connector                                   Computer connector                                              max. 30 V
    5    1               Pin 1, 2, 4 or 5     input     5 1
                                                                                 Pin 1, 2, 4 or 5

    6                                                     6
             2                                                    2
    4                                       Computer      4

         3
                         Pin 6
                                             ground           3
                                                                                  Pin 6




6 / 11                                                                                              MO 0688-0201
Data output connector pin status when testing wrist strap/shoe

                                     Test result 1:        Test result 2:          Test result 3:          Test result 4:
               Power up:
                               wrist wrap       shoe   wrist wrap      shoe    wrist wrap    shoe      wrist wrap    shoe
                                  o.k.          o.k.    not o.k.        o.k.      o.k.      not o.k.    not o.k.    not o.k.

  pin 1                 hi        hi            hi        lo           hi         hi          lo          lo          lo
  pin 2                 hi        hi            hi        hi           lo         hi          lo          hi          lo
  pin 3                 hi        hi            hi        hi           hi         hi          hi          hi          hi
  pin 4                 hi        hi            lo        hi           hi         hi          hi          hi          hi
  pin 5                 hi        lo            lo        hi           lo         lo          hi          hi          hi

The sequence for testing must be wrist strap test first and then the shoe test.
                   Shaded pin indicators will read "hi" if the sequence is reversed or only the shoe tests are
                   performed.
Data Output Connector

               1
                             pin 1, 2, 4, 5      -     high or low
         5
         6
         4
                    2        pin 3               -     +5V
               3
                             pin 6               -     DC-return




IX. Specifications
Dimension of base unit:                                              Accuracy:
138 mm x 190 mm x 53 mm                                              ± 10% of 2, 5, 10, 35 and 50 MΩ-ranges
(5.25 x 7.5 x 2) inches                                              ± 20% of 100 MΩ-range
Weight:                                                              Output:
450 g                                                                open collector at pin 1,2, 4, 5
(15.75 oz)                                                           (max. + 30 V/20 mA)
Power supply:                                                        DC-return at pin 6, + 5 V at pin 3
external AC/DC - transformer,                                        Measurement voltage:
DC 24-30 V/150 mA                                                    DC (20±1) V (open circuit)




MO 0688-0201                                                                                                                7 / 11
X. Calibration Procedure                                                                The LEDs will indicate as shown below if the 740
                                                                                        performs within specifications. Repeat this
The following procedure can be used to determine                                        procedure for 5, 10 and 35 MΩ-ranges.
if the 740 operates within its specifications.
Please note: The tester has no adjustable
components.                                                                             Reference      Resistance            LED -
                                                                                        resistor       range settings        Indication

Equipment needed:                                                                       *750 kΩ        2 MΩ - range          Red
                                                                                        900 kΩ                               Green
1. Resistors                                                                            1.8 MΩ                               Green
750 kΩ - 120 MΩ, tolerance ± 1%                                                         >2.2 MΩ                              Red
2. 2 leads                                                                              4.5 MΩ         5 MΩ - range          Green
as required to connect the reference resistor                                           >5.5 MΩ                              Red
                                                                                        9.0 MΩ         10 MΩ - range         Green
a) calibration of wrist strap test circuit:                                             >11.0 MΩ                             Red

Connect the reference resistor to the 740 as shown                                      31.5 MΩ        35 MΩ - range         Green
in the figure below. Switch the 740 unit on. Select                                     >38.5 MΩ                             Red
the 2 MΩ-range and use the reference resistors as                                       *This example is used above
indicated in the test table and press contact
plate A.




                                                                                        b) calibration of shoe test circuits:
                                                                                        The 740 Tester can either operate with the single
                  740
              wrist strap + shoe tester                  3                              or dual shoe electrode. They are identified by the
                                                                                        wiring in the 3-pin plug according to DIN 41 524,
                    <                 o.k.               >                              type HIRSCHMANN MAS 3100, that connects
              1                              2                                          the shoe electrode to the 740. For the single shoe
                                                                                        electrode, the cord is connected to pin 1 while
                                                                                        pins 2 and 3 are shunted and grounded.
750 kΩ              A                               B                                   The dual shoe electrode uses the same plug but
                                                                                        has got the following connections:
                              2
                              5
                             10
                                  -
                                  -
                                  -
                                                 - 10
                                                 - 35
                                                 - 50
                                                                                        pin 1: right shoe electrode
                             35   -              - 100
                                                             on / off
                                                                                        pin 2: open
                    Output
                                      R
                                       max                        DC 24•30 V / 150 mA

                                                                    +            -
                                                                                        pin 3: left shoe electrode.




8 / 11                                                                                                                          MO 0688-0201
I) calibration of the single shoe test circuit:                                            II) calibration of the dual shoe test circuits:
Connect a reference resistor to the 740 between                                            The 740 Tester measures the resistance of both
contact 1 of the socket and the stud as shown                                              shoes almost at the same time. The test result for
below. Contacts 2 and 3 of the socket shall be                                             the circuit of the right shoe has got priority. The
bridged via an appropriate resistor (1MΩ e.g.)                                             calibration can be either performed with two
Select the 10 MΩ-range and set the reference                                               reference resistors for both circuits to be checked
resistors as indicated in the test table and press                                         at the same time or -corresponding to the single
contact plate B.                                                                           shoe test - with one reference resistor for one
                                                                                           circuit to be checked and an appropriate bridge
                                                                                           resistor (1MΩ e.g.) for the other circuit. For
                                                                                           completion of calibration, the test has to be
                                                                                           repeated with connections of the resistors vice
                     740
                 wrist strap + shoe tester                  3                              versa. Follow the instructions for the single
                       <                 o.k.               >                              electrode calibration test accordingly.
                 1                              2
                                                                                           For the operation with two reference resistors
                                                                                           proceed as follows: Connect one reference resistor
  11.1 MΩ
                      A                                B                                   between contact 1 of the socket and the stud and
                                                                                           the other one between contacts 2 and 3. Select the
                                 2
                                 5
                                     -
                                     -
                                                    - 10
                                                    - 35
                                                                                           10 MΩ-range and set the reference resistors as
                                10   -              - 50
                                35   -              - 100
                                                                on / off                   indicated in the test table and press contact
                       Output
                                         R
                                          max                        DC 24•30 V / 150 mA

                                                                       +            -
                                                                                           plate B. The LEDs shall light as shown below.
                                                                                           Repeat this procedure for 35, 50 and 100 MΩ-
                                                                                           ranges.
                                                                                           Right shoe      Left shoe
The LEDs shall light as shown below. Repeat this
                                                                                           electrode       electrode
procedure for 35, 50 and 100 MΩ-ranges.
                                                                                           circuit         circuit         Signal
Shoe electrode
                                                                                           OK              OK              green steadily
circuit                    Signal
                                                                                           high            OK              > red steadily
OK                         green steadily
                                                                                           low             OK              < red steadily
high                       > red steadily
                                                                                           OK              high            > red flashing
low                        < red steadily
                                                                                           OK              low             < red flashing
                                                                                           high            low             > red steadily
                                                                                           low             high            < red steadily
                                                                                           high            high            > red steadily
                                                                                           low             low             < red steadily




MO 0688-0201                                                                                                                                 9 / 11
3M 740 Wrist Strap + Shoe Tester Logbook

                                Month / Year
                              1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
          Name                W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S W S

                     Test 1

                     Test 2

                     Test 1

                     Test 2

                     Test 1

                     Test 2

                     Test 1

                     Test 2

                     Test 1

                     Test 2

                     Test 1

                     Test 2

                     Test 1

                     Test 2

                     Test 1

                     Test 2

                     Test 1

                     Test 2

                     Test 1

                     Test 2

                     Test 1

                     Test 2

                     Test 1

                     Test 2

                     Test 1

                     Test 2

                     Test 1

                     Test 2

                     Test 1

                     Test 2

                     Test 1

                     Test 2

                     Test 1

                     Test 2




 Example:                                   Test parameters:                                                              Unit calibrated on:

 Not ok:                                    Wrist Strap (W)                     Shoes (S)
                                                                                                                          By:
 ok:             x                          750 kΩ to: 2 MΩ                     750 kΩ to: 10 MΩ
                                                              5 MΩ                                35 MΩ                   Next calibration on:
                       Month / Year
                        1 2 3 4                             10 MΩ                                 50 MΩ
          Name         W S W S W S W S
                                                                                                                          Serial number:
                 Test 1 x x x x x x                         35 MΩ                               100 MΩ
                 Test 2 x x x x   x




10 / 11                                                                                                                                    MO 0688-0201
Important notice to purchaser
"Warranty-3M expressly warrants that for a period
of twelve (12) months from the date of purchase,
3M Static Control Products will be free of defects
in materials (parts) and workmanship (labor).
Defects occurring during the warranty period will
be repaired or products will be replaced at 3M’s
option and expense, if 3M receives notice during
the warranty period. Defective products must be
returned to 3M with proof of purchase date.
Warranty exclusions: the foregoing express
warranty is made in lieu of all other product
warranties, express and implied, including fitness
and merchantability. The express warranty will
not apply to defects or damage due to accidents,
neglect, misuse, alterations, operator error, or
failure to properly maintain, clean, or repair
products.
Limit of liability-in no event will 3M or seller be
responsible or liable for special, incidental, or
consequential losses or damages, whether based in
tort or contract. Fulfillment of 3M’s warranty
obligations will be customer’s exclusive remedy
and 3M’s and seller’s limit of liability for any
breach of warrant or otherwise."




3
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MO 0688-0201                                                                                          11 / 11

								
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