KYORITSU 3131A - Manual (Page 13)

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DANGER
Do not touch the circuit under test immediately after testing. Capacitance
stored in the circuit may cause electric shock.
Leave the test probe connected to the circuit and never touch the circuit until
the discharge is completed.
Principle of Insulation Resistance Measurement
Resistance value can be obtained by applying a certain high voltage to the
resistance (insulation resistance) and measuring the flowing current.
Resistance Value = Voltage/Current
RX = V/I
6-3 Continuity Testing (Resistance Tests)
DANGER
● Always test the circuit or equipment to ensure it is surely de-energized
before measurement according to the instruction of 6-1.
● To avoid electrical shock, measurements must be performed on de-
energized circuits only.
● Never make measurement with the battery compartment cover removed.
CAUTION
● Never press the test button if the live circuit warning LED is lit or the
warning buzzer sounds. This may damage the circuit.
Conduct the voltage warning check before measurement to ensure that
the circuit under test is de-energized.
● In case that an additional operating circuit is connected in parallel to the
circuit under measurement, the measurement error might be caused due
to the effects of impedance of the circuit conneted in parallel or transient
current.
EARTH（＋）
LINE（−）
VOLTAGE:V
RESISTANCE
VALUE:RX
CURRENT:I