Instructions

10 GMC-I Messtechnik GmbH
4.2 Testing Protective Conductor Potential
➭ Bring the contact finger into contact with the contacting surface (4) and, at the same
time, with a grounded object (e.g. a water pipe).
The PE signal lamp (2) must not light up! Potential between the mains plug protective
conductor (1)
and the contacting surface (4) is then ≤ 100 V.
Note!
The PE signal lamp (2) does not light up, if no mains voltage is present between L and
N at the mains plug (1), or if L and PE are reversed at the mains connection. If, after
having connected the DUT in accordance with chapter 4.1, page 9, you determine,
that no characters are displayed at the LCD, the mains connection should first be
inspected – e.g. with the PROFITEST MASTER tester.
However, if the PE signal lamp (2) lights up when contact is made with the contacting surface
(4), potential between the protective conductor at the mains plug (1) and the contacting sur-
face (4) is > 100 V, i.e. voltage is present at the protective conductor or the protective con-
ductor is not connected.
Note!
Stray voltages may occur due to handling of the DUT, which cause the PE signal lamp
(2) to light up. For example, this may occur if a device is held in the hand which has
been connected to the test socket (8) due to the resultant occurrence of a capacitive
voltage divider. Touch a grounded object as described above in this case.
Attention!
!
Voltage at the mains protective conductor (phase conductor L at protective earth
conductor PE: incorrect wiring of mains socket ) also distorts measured values for
the following tests:
– Measurement of contact current per DIN VDE 0701-0702
– Residual current measurement
4.3 Measuring Mains Voltage
➭ Set the measuring function selector switch to “U
Netz
250 V”
➭ Read the measured value at the LCD.
Mains voltage must lie within the allowable range of 207 to 253 V.