28
Pre-Operation Inspection
Checking the insulation resistance test
Required items
Recommended resistor: High voltage high resistance thick lm resistor GS series
Manufacturer: KOA Corporation or equivalent
(Be careful with the working voltage and power.)
CAUTION
If the test voltage (power) exceeds the rated voltage (power) of the
prepared resistor, the resistor may become damaged.
(Example) When the insulation resistance of the equipment to be measured is 100 M
Ω
Maximum working voltage 1000 V
Rated power 0.5 W
Test voltage 500 V
1
Prepare a resistor.
2
Check that the test voltage is lower than the maximum working voltage of
the prepared resistor.
Test voltage < Maximum working voltage of the prepared resistor
(Example: 500 V < 1000 V)
3
Check that the value calculated from the test voltage and resistance
is smaller than the rated power of the prepared resistor. (If the value
calculated from the test voltage and resistance is larger than the rated
power of the prepared resistor, change the resistor or the test voltage.)
Squared test voltage ÷ Resistance < Rated power of the prepared resistor
(Example:
500 V × 500 V
100 M
Ω
= 0.0025 W
< 0.5 W)
4
Set the test voltage to 500 V.
5
Set the lower limit value to 90 M
Ω
and the upper limit value to 110 M
Ω
.
6
Connect the test leads to the prepared resistor.
7
Start a test and check that the measured resistance matches the
resistance of the prepared resistor and the comparator judgment result is
[PASS].
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