Hioki IR5050 - Page 39

39
Pre-Operation Inspection
Checking the insulation resistance measurement
Inspect the following before starting a test to use the instrument safely.
Inspect whether the measured resistance matches the prepared resistance.
If a problem exists, do not use the instrument and request repair.
Equipment:
Recommended resistance: GS Series High Voltage, High Resistance Thick Film
Resistor or equivalent product (pay attention to the
operating voltage and power)
Manufacturer: KOA Corporation
CAUTION

Do not allow the test voltage (power) to exceed the rated voltage
(power) of the prepared resistor.
Doing so could damage the resistor.
Setting example: When the insulation resistance of the object under measurement is
100 M
Ω
Maximum operating voltage 1000 V
Rated power
0.5 W
Test voltage 500 V
1
Prepare the resistor.
2
Conrm that the test voltage is less than the maximum operating voltage
of the prepared resistor.
Test voltage < Maximum operating voltage of prepared resistor
(Example: 500 V < 1000 V)
3
Conrm that the value calculated from the test voltage and resistance is
less than the rated power of the prepared resistor (if the value calculated
from the test voltage and resistance is greater than the rated power of the
prepared resistor, change the resistor or change the test voltage).
Square of test voltage
Resistance
< Rated power of prepared resistor
(Example:
500 V
×
500 V
100 M
Ω
= 0.0025 W < 0.5 W
)
4
Set the test voltage to 500 V.
HIOKI IR5050A961-00