Bedienungsanleitung Gossen Metrawatt AT3-III E (Seite 5 von 12) (Englisch)

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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,

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