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Troubleshooting
Symptom Check Items Remedy and Reference
A different
measured value
results each
time the same
measuring object
is measured.
Is there any impact due
to the material of the
measuring object?
Allow an adequate amount
of time (about 1 hour to
1 day) to pass after the
rst measurement before
repeating measurement.
The effects of polarization*
2
increase as the insulation
resistance increases.
Is there any impact due to
the temperature/humidity
characteristics of the
measuring object?
Measure the object under
the same temperature
and humidity conditions.
In general, an insulator’s
insulation resistance
value will decrease as
temperature and humidity
increase.
Reference: the insulation
resistance value of some
insulated cables decreases
to 1/4 or less when the
temperature increases 10°C.
The output
voltage polarity is
reversed.
The reversal is due to
the characteristics of the
insulation ohmmeter.
This does not represent a
malfunction.
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