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Gossen Metrawatt AT3-III E Manual

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GMC-I Messtechnik GmbH 3
Table of Contents
Page
1 Applications ...............................................3
2 Safety Precautions .....................................4
3 Connecting the Test Adapter to the Mains 5
4 Connecting a Device Under Test
to the Test Adapter ....................................5
5 Testing Devices .........................................5
5.1 Measuring Protective Conductor Resistance ...5
5.2 Measuring Insulation Resistance and Equivalent
Leakage Current ..........................................5
5.3 Measuring Protective Conductor Resistance with
the Residual Current Method (except for
SECUTEST BASE(10)) ...................................5
5.4 Testing of Differential Current
during Automatic Testing per Test Standard ..7
5.5 High-Voltage Test ........................................7
6 Testing Extension Cables ...........................7
6.1 Measuring Protective Conductor Resistance ...7
6.2 Measuring Insulation Resistance ...................7
6.3 Testing for Short-Circuits, Interruptions and
Reversed Conductors ...................................8
7 Self-Test ..................................................10
8 Technical Data .........................................10
9 Maintenance ............................................11
10 Repair and Replacement Parts Service,
Calibration Center and Rental Instrument
Service .....................................................11
11 Product Support .......................................11
1 Applications
The portable test adapter, which can also be
permanently mounted with the wall bracket, is
used for measuring and testing single and
3-phase electrical devices and extension cables in
combination with SECUTEST.../SECULIFE ST (as
of version 3.1) test instrument.
Suitable instruments are identified in the following
pages with the following abbreviated designation:
SECUTEST.../SECULIFE ST.
Testing must be performed by a qualified
electrician with an appropriate test instrument
after repair or modification, and is also required for
periodic testing per DIN VDE 0105/0701-0702.
According to these regulations, testing must be
performed for protective conductor resistance,
insulation resistance, equivalent leakage current,
residual current and contact current, as well as for
the absence of voltage depending upon the type
of device under test.
The test adapter, in combination with the SECUTEST.../
SECULIFE ST test instrument, allows for
– the passive testing:
• of protective conductor resistance
• of insulation resistance
• of protective conductor current by means of
equivalent leakage current method
• of dielectric strength (HV test up to 1.5 kV)1)
• at extension cables:
– testing for conductor short-circuiting,
– testing for conductor interruption
and aditionally at 3-phase extension cables:
– testing for conductor reversal on L1, L2
and L3
for the determination of clockwise rotation.
• with protection by means of electronic resid-
ual current monitoring with mains shutdown
at DUTs with residual current of more than
20 mA and visual error messages
– the active testing: (nominal current 16 A –
maximum 20 A current consumption by DUT)
• of protective conductor current 1 3
– by means of the differential current method
(requires voltage measurement sockets at
SECUTEST.../SECULIFE ST 2)
– by means of direct method (requires direct
measurement of protective conductor
current at SECUTEST.../SECULIFE ST)
• of contact current 3
1only if the utilized SECUTEST.../SECULIFE ST is
capable of performing this measurement
2not with SECUTEST BASE(10), but with
SECUTEST PRO and/or Feature I01
3Please note that the pole reversal function is not active
with the applied test instrument if you use the AT3-IIIE
adapter for the testing of single-phase test objects
(socket 3 / earthing contact plug). In this case, all
leakage current measurements must be performed
manually in both pole directions.
Measurement results are displayed at the
SECUTEST.../SECULIFE ST test instrument.
Note!
The AT3-III E test adapter is equipped with
electronic error monitoring which
disconnects the device under test from the
mains in the event of fault currents of greater
than 18 mA.
3 …


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