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2.5 Insulation Resistance Measurement
The instrument is used to measure insulation resistance in the
electric circuit or in the appliance in order to inspect the
insulation performance. When measuring insulation resistance,
you have to select the voltage applied to the object to be
measured.
2.5 Insulation Resistance
Measurement
Observe the following to avoid electric shock, short
circuits 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.36)
• 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 current to applied
voltage, and is therefore unstable. Depending on the specific
object being measured, the displayed value may not
stabilize, this does not necessarily indicate a malfunction.
• Press the MEASURE key fully down until a live circuit
indicator lights up. If the button is not pressed down fully, a
proper measurement cannot be made.
• After use, please turn the rotary 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 voltage is unknown, it is recommendable to
remove that from the circuit for measurement.
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