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8 Insulation resistance measurement
This instrument is used to measure insulation resistance of 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:
● D epending on the object to be measured, displayed insulation resistance
value may not stabilize.
● T he instrument may give bleep during an insulation resistance measure-
ment, however, this is not a malfunction.
● Measurement time may be longer when measuring a capacitive load.
● I n insulation resistance measurement, the earth terminal outputs positive
voltage and the line terminal negative voltage.
● C onnect the earth lead 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.
# DANGER
● B e extremely careful not to touch the tip of test probe or the circuit under
test to avoid electrical shock during insulation measurement since high
voltage is present at 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.
● T he battery compartment cover must be closed before you operate the
instrument.
# CAUTION
Always disconnect power to the equipment under test before starting
insulation measurement. Do not attempt to make measurements on a live
circuit; otherwise, it may damage the instrument.
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