Insulation Resistance Measurement - KYORITSU KEW3431 Instruction Manual

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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:
● 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.
● M easurement time may be longer when measuring capacitive
load.
● I n insulation resistance measurement, the earth terminal outputs
positive voltage and the line terminal negative voltage.
● C onnect 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.
# DANGER
● B e extremely careful not to touch the tip of test probe or
circuit under test to avoid electrical shock during insulation
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.
● N ever make measurements with the battery compartment cover
removed.
# CAUTION
Always disconnect power to the conductor under test before
starting insulation measurement. Do not attempt to make
measurements on a live conductor. Otherwise, it may damage the
instrument.
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