Gmw TG UNI 1AVDE-tester DIN VDE 0701/ 0702 61000 00200 Benutzerhandbuch

If the following message appears in the display:
‚Fault: zero balance’
and a permanent warning signal sounds, the measuring line resistance is
greater than 2 

Ω and cannot be compensated.

The protective conductor resistance test is locked.
In this case the measuring line should be checked or be replaced with a
low-impedance version.

If the measuring line has been successfully compensated – the following
message appears in the display
‚Zero balance OK’.

Press the [Next] button, only then disconnect the line!

In the case of 

devices of 

protection class I, on which the insulation

resistance measurement cannot or may not be carried out, the protective
conductor current measurement is an alternative measurement for
determining the insulating capacity.

The protective conductor current can be determined either by the direct
measuring method, the differential current method or the substitute leakage
current method.

The direct measuring method or the differential current method should be
used with test objects that can only be switched on with mains voltage
(also see Point 9.8).

The differential current measurement determines the total leakage current of
the test object by measuring the total current of all avtive conductors (L-N).
The differential current measurement must be applied if the test object has
additional earthing connections or cannot be insulated.

Direct measurement can be applied if the test object has no additional
earthing connections or can be insulated.

In order to change the measuring method, press the [Measure] function
button in the configuration menu, see Fig. 5.
The symbol in the headline changes accordingly:

[DIR.] – direct measurement
[DIF.] – differential current method

10

Operating manual for the TG uni 1 appliance tester
Commissioning

6.2 Compensation of the measuring line
In order to achieve correct results when measuring the protective conductor
resistance, the resistance of the measuring line must be compensated (zero
balance).
Press the fuction button [Comp.]  (Fig. 5).
The zero balance menu appears. Follow the instructions in the display
(Fig. 6):

– Connect the test tip/test
clip with the measuring line
and insert the measuring
line plug in the ‚Probe’
socket (Fig. 1).
– Connect the test tip/test
clip with the protective
earthing contact of the test
socket.

Fig. 6