Operation Manual

GMC-I Messtechnik GmbH 21
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Touch Current – Testing for Absence of Voltage
Direct Measurement Method
The device under test is operated with mains power. Current
which flows to the protective conductor via exposed conductive
parts is measured. The measurements must be performed with
mains plug polarity in both directions. The AC or the DC compo-
nent of the current is measured. The value which has been adjus-
ted to nominal line voltage is displayed (see section 4.3).
Note
Make sure that the contacted parts are not grounded.
Differential Current Measurement Method
The device under test is operated with mains power. The sum of
the momentary values of all currents which flow through all active
conductors (L/N) at the mains side of the device connection is
measured. The measurements must be performed with mains
plug polarity in both directions. The value which has been adjus-
ted to nominal line voltage is displayed (see section 4.3).
Alternative Measurement Method
The device under test is tested with the nominal voltage which
has been selected in the setup menu. Current which would flow
with this nominal voltage is displayed.
Type of Test Current Parameter
DIR Touch current, direct (with probe)
DIF Differential current, (with probe)
ALT Alternative touch current, (with probe)
DL Contact current with 2 probes (DL = Dual Lead)
Mains Polarity Parameter (not for 2-probe Measurement)
Polarity can be reversed for measurements during which the
mains are connected to the test socket.
Direct Measurement Method Differential Current Measurement Method
Alternative Measurement Method 2-probe Measurement Method