Manual

44 Gossen Metrawatt GmbH
Measurement With or Without Probe
Measurements can be performed with or without a probe.
Measurements with probe require that the probe and reference
earth are of like potential. This means that the probe must be
positioned outside of the potential gradient area of the earth elec-
trode (R
E
) in the RCD safety circuit.
The distance between the earth electrode and the probe should
be at least 20 m.
The probe is connected with a 4 mm contact-protected plug.
In most cases this measurement is performed without probe.
Attention!
!
The probe is part of the measuring circuit and may carry
a current of up to 3.5 mA in accordance with IEC 61557
/ EN 61557.
Testing for the absence of voltage at the probe can be performed
with the U
PROBE
function (see also section 11.1 on page 41).
12.1 Measuring Touch Voltage (with reference to nominal resid-
ual current) with ⅓ Nominal Residual Current and Tripping
Test with Nominal Residual Current
Select Measuring Function
Connection
Set Parameters for I
N
I
N
Nom. res. current: 10 … 500 mA
Type 1: RCD, SRCD, PRCD …
Nominal current: 6 … 125 A
Type 2*: AC , A , F
, B , B+
, EV, MI
k
* Types B, B+, EV, MI =
AC/DC sensitive
Phase displacement: 0°/180°
X times tripping current:
Negative/positive half-wave
Negative/positive direct current
1, 2, 5 (I
N
max. 300 mA)
Waveform:
Connection:
Without/with probe
System type:
TN/TT, IT
Touch voltage:
Time to trip:
< 25 V, < 50 V, < 65 V