Kyoritsu 3131A User Manual download pdf (Page 12)

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6-2 Insulation Resistance Measurement

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.

● When the test button is pressed with the range selector switch in the

insulation position, take care not to touch the tip of the test probe and the

circuit under test where a high voltage is present in order to avoid

possible shock hazard.

● 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.

① Check the voltage which can be applied to the circuit under test and set

the range selector switch to the desired nominal output voltage range.

② Connect the earth clip of the test probe (black) to the earth terminal of the

circuit under test.

③ Put the tip of the line probe (red) to the circuit under test and press the

test button.

④ Read the scale directly for the 500V range, multiply by 0.5 for 250V and

by 2 for 1000V.

Fig.5 Insulation resistance measurement

Connect earth probe

to earth terminal

CAUTION

Always turn off breaker

for circuit under test

before insulation test

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Kyoritsu 3131A User Manual Page 12