
Gossen Metrawatt GmbH
5
•
If the test adapter and/or its connector cables
demonstrate visible damage, no longer func
-
tion, have been stored for a lengthy period of
time under unfavorable conditions or have
been subject to excessive stress during trans
-
port, it must be assumed that hazard-free
operation is no longer possible. Remove the
AT3-III E from service and secure it against
inadvertent use in such cases.
Opening of Equipment / Repair
The equipment may be opened only by authorized
service personnel to ensure the safe and correct
operation of the equipment and to keep the war
-
ranty valid.
Even original spare parts may be installed only by
authorized service personnel.
In case the equipment was opened by unautho
-
rized personnel, no warranty regarding personal
safety, measurement accuracy, conformity with
applicable 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!)
European conformity label
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
AT3-III E
Test Adapter to the
Mains
The following connections must first be estab
-
lished before connecting the test adapter to the
mains:
a) Insert the mains plug from the test instrument
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 test instru
-
ment.
c) In order to measure protective conductor cur
-
rent, connect the test instrument port (14) of
the AT3-III E into sockets 2 and 3 at the
SECUTEST SIII / SIII+ / SIII+H; SECUTEST
S2N+ / S2N+10 / N+w; SECULIFE ST / ST
HV or into sockets V and COM at the SECUT
-
EST PRO; SECUTEST ST PRO; SECULIFE ST
BASE / ST BASE25.
d) In order to test extension cables, insert the
test probe at the end of the probe cable of the
test instrument 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 appro
-
priate plug or socket at the test adapter, as well as
before each new test, the 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 CONDUC
-
TOR 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 mea
-
sured, and high-voltage testing cannot be per
-
formed.
5
Testing Devices
Perform testing in accordance with the operating
instructions included with the test instrument!
Observe the following instructions when using the test
instrument in combination with the AT3-III E
during
automatic test sequence
:
For some test sequences, a suitable AT3 adapter
must be used as connection type.
5.1
Measuring Protective Conductor Resistance
The clip or the test probe at the end of the probe
cable from the 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
. In
order to compensate for this error, proceed
as described in the operating instructions
included with the test instrument under Indi
-
vidual Measurements
Protective Conduc
-
tor 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.
!