KYORITSU 3131A - Manual (Page 12)

― 10 ―
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