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Insulation Resistance Measurement
3.5 Insulation Resistance Measurement
The instrument is used to measure the insulation resistance to
determine the insulation performance of circuits and equipment.
Before starting a measurement, the voltage to be applied to the
measuring object needs to be selected.
WARNING
Observe the following to avoid electric shock, short
circuit, or damage to the instrument.
• 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
measuring object before starting.
• 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.
• Do not touch the measuring object immediately after
measurement. Doing so may cause electric shock
due to a highly charged voltage.
• Discharge the measuring object with the discharge
function of the instrument after a measurement. (p. 39)
• Insulation resistance is the ratio of applied voltage to leakage current.
Displayed value may not stabilize depending on the measuring object,
but it is not a failure of the instrument.
• 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.
• Turn off the rotary switch after use.
• Disconnection when measuring is recommended of any equipment
having a lower withstanding voltage than the test voltage, or equipment
or parts having an unknown withstanding voltage connected to the circuit
to be measured.
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