Operation Manual

GMC-I Messtechnik GmbH 45
R
PE
PE Resistance
Combined Test – Differential Protective Conductor Resistance
Zero balancing is also possible for protective conductor measure-
ment. With zero balancing, all subsequent measurements are ad-
justed with an offset such that 0  is displayed for a selected ref-
erence point which is connected to the protective conductor.
When test points are contacted with the probe which are electri-
cally connected to this reference point, differential resistance R
PE between the reference point and the contacted test point is
displayed.
Zero balancing is started by activating the “Set” key, and is ended
pressing the ONSTART key.
The zero point is set until it’s cleared, or until the measurement is
exited.
Maximum Allowable Limit Values for Protective Conductor Resistance
for Connector Cables with Lengths of up to 5 m
1)
This value may not exceed 1  for permanently connected data pro-
cessing systems (DIN VDE 0701, part 240).
2)
Permanently connected cable
3)
Max. 1 
Test Standard
Test c urren t
Open-Circuit
Voltage
R
PE
Housing –
Device Plug
R
PE
Housing –
Mains Plug
VDE 0701-0702
> 200 mA 4 V < U
L
< 24 V
0.3 
1)
+ 0.1 
3)
for each
additional 7.5 m
IEC 62353
(VDE 0751-1)
0.2  0.3 