GMC-I Messtechnik GmbH
29
4.2
Insulation Resistance Test
In accordance with EN 60204/DIN VDE 0113, insulation resis-
tance measured between the phases of all current circuits and
the protective conductor circuit with 500 V direct voltage may not
be less than 1 M
.
Four nominal voltage ranges are included with the
PROFITEST 204+
for this test: 100 V, 250 V, 500 V and 1000 V. These can be con-
figured as test parameters, as is also the case with the allowable
limit value for insulation resistance.
The measurement can be started in an ideal fashion with the key
(21) on the test probe (17). For capacitive devices under test, or
for DUTs with relatively long cables, press and hold the key (21 or
10) until stabilized display values have been obtained. When the
START key is pressed and held, the instrument performs
continuous, instead of an individual measurement.
Voltage at the device under test appears at the LCD in addition to
measured insulation resistance.
Discharge
Upon completion of the measurement, the device under test is
automatically discharged in order to assure absence of voltage.
The falling voltage value can be observed at the display during
discharging. The measured insulation resistance value remains in
memory during this period of time.
Interference voltage
If voltage is present at the test probes after
measurement has begun, no measurement is
performed.
Interference voltage at test probes
appears at the display, and a
STOP signal
is
displayed simultaneously.
!
Attention!
Do
not
touch the test probes during this measurement!
A direct voltage of up to 1000 V is present between the
test probes.
Note
Testing of measurement cables
The first test should be conducted on test probes with
short-circuited measurement cables. The instrument
must indicate a value of approximately zero
. This
serves to establish whether the measurement cables are
disconnected at any point.
TEST
Select the desired test.
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Summary of Contents for PROFITEST 204
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