KYORITSU 3132A - Manual (Page 15)

required test voltage when providing a steady state current of 1mA.
The minimum allowable resistance level is 0.25M
Ω for the 250V test,
0.5M Ω for the 500V test and 1M Ω for the 1000V test.
● 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.
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④ Check the circuit under test is not energized as follows.
Connect the test probe to the circuit under test and read a voltage value.
If the circuit is live, the meter indicates the voltage, the live circuit lamp is
lit, and warning buzzer sounds.
If the meter indicates 0V, the circuit is dead.
⑤ Press test button. Read the scale directly for the 500V range, multiply by 0.5
for 250V and by 2 for 1000V.
●Continuous Measurement
A lock down feature is incorporated on the test button. Pressing and
turning it clockwise, lock the test button in the continuous operating
position.
To release the lock turn the test button counterclockwise.
Never leave the test button locked down when not is use.
DANGER
Be extremely careful not to get electric shock during insulation resistance
measurement as high voltage is present on the tip of the test probe
continuously.
⑥ With the test probe still connected to the circuit under test after testing,
release the test button to discharge capacitance in the circuit.
●Automatic Circuit Capacitance Discharge Function
This function allows the capacitance stored in the circuit under test to be
automatically discharged after testing.
Discharge can be monitored by the voltage warning range.
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.
●Output voltage characteristics
The insulation resistance tester must be capable of maintaining the
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