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Gossen Metrawatt AT3-III E Manual

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GMC-I Messtechnik GmbH 5
safety measures or any consequential damage is
granted by the manufacturer.
Meanings of Symbols on the Instrument
Warning concerning a point of danger
(Attention: observe documentation!)
Indicates EC conformity
This device may not be disposed of
with the trash. Further information
regarding the WEEE mark can be
accessed on the Internet at
www.gossenmetrawatt.com by
entering the search term ’WEEE’.
3 Connecting the Test Adapter to the Mains
The following connections must first be
established before connecting the test adapter to
the mains:
a) Insert the mains plug from the
SECUTEST.../
SECULIFE ST
into the earthing contact outlet (12)
at the AT3-III E.
b) Insert the earthing contact plug (13) from the
AT3-III E into the test socket at the
SECUTEST.../SECULIFE ST.
c) In order to measure protective conductor
current, connect the SECUTEST port (14) of
the AT3-III E into sockets 2 and 3 at the
SECUTEST.../SECULIFE ST or into sockets V
and COM at the SECUTEST PRO.
d) In order to test extension cables, insert the test
probe at the end of the SECUTEST... probe cable
into the socket (15) at the AT3-III E.
Connect the test adapter to 230/400 V mains
power. The test adapter now performs a self-test.
If the tester is intact, the red LED lights up briefly.
4 Connecting a Device Under Test
to the Test Adapter
After the device under test has passed a visual
inspection and before connecting it to the
appropriate plug or socket at the test adapter, as
well as before each new test, the SECUTEST.../
SECULIFE ST test instrument must be returned to
its initial setting depending upon the type of test.
Connect the device under test to the test adapter
and switch all of its functions on, making sure
that, for example, thermostat contacts are closed
etc. Always measure protective conductor
resistance first for safety class I devices, because
if the protective conductor is defective, insulation
resistance, equivalent leakage current and
protective conductor current cannot be
measured, and high-voltage testing cannot be
performed.
5 Testing Devices
Perform testing in accordance with the operating
instructions included with the SECUTEST.../SECULIFE ST
test instrument!
Observe the following instructions when using the
SECUTEST.../SECULIFE ST in combination with the AT3-
III E during automatic test sequence :
5.1 Measuring Protective Conductor Resistance
The clip or the test probe at the end of the probe
cable from the SECUTEST.../SECULIFE ST test
instrument must be connected to the housing of
the device under test such that good contact is
assured.
Note!
Connector cable (13) resistance is 0.07 Ω. In
order to compensate for this error, proceed
as described in the operating instructions
included with the
SECUTEST.../SECULIFE ST test instrument
under Individual Measurements → Protective
Conductor Resistance → Zero Balancing.
If the AT3-III E is out of use for a prolonged period
of time, the earthing contact faces of the plug-
and-socket connectors and the connecting plug
(13) may corrode, thus leading to slightly elevated
resistance measurement values. In this case, plug
and unplug the connections several times until the
expected values are reached again.
5.2 Measuring Insulation Resistance and Equivalent
Leakage Current
L1, L2, L3 and N (short-circuited) are measured
against PE during insulation testing.
5.3 Measuring Protective Conductor Resistance with
the Residual Current Method (except for
SECUTEST BASE(10))
The DUT is placed into operation during residual
current measurement. The L1, L2 and L3 mains
lamps light up at the AT3-III E during this test.
This measurement may not be performed on safety
class I devices until after the protective conductor test
has been passed in accordance with chapter 5.1.
ÐTurn off the device under test.
ÐSelect the IL-DI measurement setting at the
SECUTEST.../SECULIFE ST.
ÐThe line contactor switches mains power to
the test outlets (1 – 4) at the AT3-III E. Signal
lamps L1, L2 and L3 indicate the presence of
line voltage.
ÐNow switch on the DUT
(as described in chapter 2).
Contact current is measured by means of residual
current measurement for safety class II devices,
!
… 5 …


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