Sonel PAT-1 - Measurement of Insulation Resistance - R

OPERATING MANUAL PAT-1, PAT-2, PAT-2E, PAT-10 version 1.02
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4.2.3 Measurement of insulation resistance - R
ISO
Proper insulation resistance is crucial for the operating safety of devices. It should be measured to-
gether with the power supply cord. According to the standards (among others: Polish, British, Ger-
man), it should be measured with the test voltage of 500V and with the measuring current of 1mA.
The measuring time should be at least 60 seconds.
The test is done between shorted L-N wires and the exposed metallic parts of the enclosure. Not only
the main components must be checked but also any bolts, terminals or other metallic parts. It may
occur that a bolt, e.g. after mounting device holder, damages the insulation of the live conductor and
becomes live.
In order to measure resistance of insulating parts, they can be wrapped (tested device or its parts)
with an aluminum foil on the entire surface.
This test is performed to evaluate the condition of insulation of the tested device. R
ISO
measurement
can be performed with the test voltage of 250V (only PAT-10) or 500V.
Press MANUAL button to go to insulation
resistance measurement – icon
will be displayed for 250V test voltage
measurement or for 500V (after
pressing MANUAL button again). The
measurement procedure is the same for
both voltage values.
The tester is in insu-
lation resistance
measurement mode.
Press SET/SEL button to set the meas-
urement parameters.
Use and
to set the upper limit of
R
ISO
resistance.
Use and to go to the test time dura-
tion settings.
Use and
to set the test time
duration value.