Kyoritsu 3131A User Manual download pdf (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

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Kyoritsu 3131A User Manual Page 13