KYORITSU 3147A - Manual (Page 14)

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(1) Check the maximum voltage that may be applied to the circuit
under test. Set the Range switch to a desired insulation
resistance range.
(2) Connect Earth probe to the earth terminal of the circuit under
test. If the circuit is not earthed, connect Earth probe to any
appropriate conductor.
(3) Connect Line probe to the circuit under test and press the Test
button or Remote control switch.
(4) Take the reading on the scale for the selected insulation
resistance range.
Load side
Circuit breaker
Remote control switch
Press the test button or remote control switch.
Select range
Test button
Connect side Earth terminal
source side
CAUTION
Make sure to furn
off the circuit
breaker.
(5) Release the Test button or Remote control switch and leave
the probes connected to the circuit under test to discharge
charges stored in the capacitance of the circuit.
DANGER
¡ Do not touch the circuit under test immediately after testing.
Charges stored in the capacitance of the circuit may cause
electrical shock.
¡ Leave the probes connected to the circuit under test until the
pointer returns to the left end of the scale. Never touch the
circuit before the discharging completes.