Chapter 2 Measurement Procedures
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The instrument is used to measure insulation resistance in the
electric circuit or in the appliance in order to inspect the degree of
electrical insulation. When measuring insulation resistance, you
have to select the voltage applied to the object to be measured.
2.4 Insulation Resistance Measurement
Observe the following to avoid electric shock, short cir-
cuits and damage to the instrument:
• When measuring insulation resistance, dangerous voltage
is applied to the measurement terminals. To avoid electric
shock, do not touch the metal part of the test leads.
• Never touch the object being measured immediately
after measuring. There is danger of electric shock from
the charge accumulated during high voltage testing.
• Discharge the subject conductor after measurement.
( p.19)
• Do not attempt to measure insulation resistance on a
live conductor. Doing so could damage the instrument
or cause an accident that might result in injury or
death. Always turn off power to the conductor being
measured before starting.
• Insulation resistance is the ratio of leakage cur-
rent to applied voltage, and is therefore unstable.
Depending on the specific object being mea-
sured, the needle may not stabilize, but this is
not a meter malfunction.
• Press the MEASURE key fully down until a live
circuit indicator lights up. If the button is not
pressed down fully, the needle will not move from
and a proper measurement cannot be made.
• After use, please turn the function selector to
OFF.
• When inspecting on an electric power circuit
including an appliance whose withstand voltage
is lower than the test voltage or including an
appliance or components whose withstand volt-
age is unknown, it is recommendable to remove
that from the circuit for measurement.
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