④
Read the resistance value from the LCD.
⑤
With the test probe still connected to the circuit under test, release the test
button to discharge capacitance in the circuit after measurement.
DANGER
Do not touch the circuit under test immediately after testing. Capacitance
stored in the circuit may cause electric shock.
Leave test probes 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
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15
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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 M
Ω
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 is indicated 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 function switch and the range selector switch to the desired range.
②
Connect the test probe (black) to the earth terminal of the circuit under
test.
③
Put the tip of the test probe (red) to the circuit under test and press the
test button.
The buzzer sounds intermittently during measurement.
Current outputs from the earth terminal, and returns to the line terminal.
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