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750 version 5
31-Oct-11
1 of 4
CORE ELECTRICAL
Demonstrate knowledge of electrical
test instruments and take
measurements
level: 2
credit: 2
planned review date: May 2009
sub-field: Electrical Engineering
purpose: This unit standard is for people needing to make basic
electrical measurements of voltage, current, resistance,
continuity, and insulation.
People credited with this unit standard are able to
demonstrate knowledge of electrical test instruments, and
take electrical measurements.
entry information: Open.
accreditation option: Evaluation of documentation by NZQA and industry.
moderation option: A centrally established and directed national moderation
system has been set up by the ElectroTechnology Industry
Training Organisation.
special notes: 1 This unit standard has been developed for learning and
assessment off-job.
2 References
Electricity Regulations 1997;
Health and Safety in Employment Act 1992;
AS/NZS 3000:2000, Electrical installations (known as
the Australian/New Zealand Wiring Rules);
AS/NZS 4836:2001, Safe working on low-voltage
electrical installations;
Electrical Workers Registration Board, Electricity
Regulations Compilation 2003. Available from
Legislation Direct, PO Box 12 418, Wellington;
Electrical Workers Registration Board, Manual for
Safety Training in the Electrical Industry, (2000)
Wellington;
and all subsequent amendments and replacements.
New Zealand Qualifications Authority 2011
750 version 5
31-Oct-11
2 of 4
CORE ELECTRICAL
Demonstrate knowledge of electrical
test instruments and take
measurements
3 Definitions
a.c – alternating current;
d.c – direct current.
4 The prove-test-prove method refers to proving the
instrument before and after a test to ensure that it
works properly, and is particularly important when
confirming electrical isolation. Some instruments have
fused leads and may give false indication of isolation if
the fuse is open circuit or blows during the test.
Proving is done by applying the instrument to a circuit
that is known to be energised and observing the
measured voltage, testing the circuit to be isolated to
ensure it is in fact isolated, then proving the instrument
again on a circuit that is known to be energised.
Elements and Performance Criteria
element 1
Demonstrate knowledge of electrical test instruments.
performance criteria
1.1 The operation of moving coil and moving iron meters is described in terms of
component parts and fundamental principles of electromagnetism.
1.2 Analogue instruments are described in terms of their principles of operation and
their applications.
Range: instruments – d.c ammeter, d.c voltmeter, ohmmeter, multimeter;
applications – use of series and parallel shunts, battery,
potentiometer, diode, selector switch.
1.3 Digital instruments are described in terms of their principles of operation and
their applications.
Range: instruments – multimeter, clip-on ammeter, insulation tester;
applications – a.c and d.c voltage and current, resistance,
insulation, continuity, diode testing; other specialised functions.
New Zealand Qualifications Authority 2011
750 version 5
31-Oct-11
3 of 4
CORE ELECTRICAL
Demonstrate knowledge of electrical
test instruments and take
measurements
1.4 Instruments are identified from physical or pictorial displays, and a sketch
provided showing how each would be connected to perform a measurement.
Range: voltmeter, ammeter, ohmmeter, multimeter, clip-on ammeter,
insulation tester. Instruments may be analogue or digital.
1.5 Consequences of incorrect use of test instruments are stated.
Range: incorrect uses include – polarity reversed, use of wrong
instrument, incorrect connection to the circuit, incorrect range or
function selection, open circuit fuse in fused lead, broken test lead,
open circuit test lead.
element 2
Take electrical measurements.
Range: a.c and d.c voltage, a.c and d.c current, resistance, continuity, insulation
resistance.
performance criteria
2.1 Instrument is selected to match the type of measurement in terms of range and
class of instrument.
2.2 Instrument is visually inspected for safety prior to testing according to industry
practice.
2.3 The prove-test-prove method is demonstrated according to industry practice.
2.4 Measurements are taken following industry practice and safety procedures.
2.5 The approximate tolerance for each measurement is stated, according to
industry practice.
Comments on this unit standard
Please contact the ElectroTechnology Industry Training Organisation
reviewcomments@etito.co.nz if you wish to suggest changes to the content of this unit
standard.
New Zealand Qualifications Authority 2011
750 version 5
31-Oct-11
4 of 4
CORE ELECTRICAL
Demonstrate knowledge of electrical
test instruments and take
measurements
Please Note
Providers must be accredited by the Qualifications Authority or a delegated inter-
institutional body before they can register credits from assessment against unit standards
or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by the Qualifications Authority before
they can register credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for providers wishing to
develop education and training programmes, such as minimum qualifications for tutors and
assessors, and special resource requirements.
This unit standard is covered by AMAP 0003 which can be accessed at
http://www.nzqa.govt.nz/site/framework/search.html.
New Zealand Qualifications Authority 2011
