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7.4
Testing for the Absence of Voltage at User Accessible, Exposed Conductive Parts
According to DIN VDE 0701, part 240, all exposed conductive parts must be tested for the
absence of voltage after maintenance, repair or modification of data processing equipment
and office machines.
This applies to:
•
Safety class I devices for user accessible, exposed conductive parts which are not
connected to the protective conductor
•
Safety class II devices (totally insulated appliances) for all user accessible, exposed
conductive parts
with the mains plug poled in both directions.
Connect the test instrument to a separate mains outlet parallel to the device under test.
The mains outlets to which the test instrument and the DUT are connected must be con-
nected to the same protective conductor system. The device under test must be oper-
ated at the mains for the entire duration of the measurement.
The device under test can also be connected to the mains outlet at the test instrument
(7).
DUT must be in operation!
!
Attention!
The data processing system or office machine must be disconnected from supply
power in order to perform testing for the absence of voltage with the mains plug
poled in both directions. However, the mains plug may only be pulled with approval
from the responsible party!
A defect in the device under test may cause tripping of the residual current circuit
breaker during testing, which would also result in interruption of supply power.
Data must be backed up before measurements are performed at data processing equipment!
The manufacturer of the test instrument assumes no liability for loss of data or other
damages which result from use of the test instrument.
Switch all DUT functions on.
Set the measuring range selector switch to the "2 mA~" position.
Connect a measurement cable with test probe to the jack/terminal (6) and contact all
exposed conductive parts at the device under test, or all exposed conductive parts
which are not connected to the protective conductor for safety class I devices.
Read each measured value in "mA" from the LCD.
According to DIN VDE 0701, part 240, these measured values may not exceed 0.25 mA.
GOSSEN-METRAWATT
To exposed
conductive parts
To mains
outlet
Test cable, e.g. KS13
2mA~
23
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