8. Insulation resistance measurement
This instrument is used to measure insulation resistance in electric appliance
or circuit to inspect the insulation performance. Check the voltage rating of
the object to be tested before making measurement and select the voltage
applied to.
Note:
● Depending on the object being measured, displayed insulation resistance
value may not stabilize.
● The instrument may give bleep during an insulation resistance measure-
ment, however, this is not a malfunction.
● Measurement time may be longer when measuring capacitive load.
● In insulation resistance measurement, the earth terminal outputs positive
voltage and the line terminal negative voltage.
● Connect the earth cord to the earth (ground) terminal at measurement.
It is recommended to connect the positive side to the earth side when
measuring insulation resistance against ground or when a part of the
object under test is earthed. Such connection is known to be more
suitable for insulation testing since insulation resistance values
measured with the positive side connected to earth are typically less
than those taken through the reversed connection.
CAUTION
● Be extremely careful not to touch the tip of test probe or circuit under test
to avoid electrical shock during insulation resistance measurement as
high voltage is present on the tip of the test probe continuously.
● Wipe the test probe with a soft cloth, if it is wet, and use it after it’s dry.
● Never make measurements with the battery compartment cover
removed.
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