Hioki BT5525, Инструкция по эксплуатации, Страница: 27 / 215

27
Inspecting the Instrument before Test
Checking the insulation resistance test
Tools to be prepared
Recommended resistor High voltage/high resistance thick film resistor GS series
Manufacturer KOA Corporation or an equivalent resistor
Pay attention to the voltage and wattage to be used.
CAUTION
„
Do not input any test voltage (wattage) exceeding the rated voltage (wattage) of
the prepared resistor.
The resistor can be damaged.
Setting example
When the insulation resistance value of the DUT is 100 M
Ω
and the test voltage to be applied is
500 V
1
Prepare a resistor suitable for the insulation resistance value of the DUT.
2
Make sure that the test voltage is lower than the maximum service voltage of the prepared
resistor.
Test voltage < Maximum service voltage of the prepared resistor
Check that the power consumption calculated from the test voltage and insulation resistance value
of the DUT is less than the rated power of the prepared resistor.
(If the power consumption calculated from the test voltage and insulation resistance value of the
DUT is greater than the rated power of the prepared resistor, change either the resistor or the test
voltage.)
Example
Square of the test voltage / Insulation resistance value of the DUT < Rated power of the prepared resistor
500 V
×
500 V
100 M
Ω
= 0.0025 W
< 0.5 W
3
Set the test voltage to 500 V.
4
Set the lower limit value to 90 M
Ω
and the upper limit value to 110 M
Ω
(when a 100 M
Ω
resistor is used).
5
Connects the test leads to the prepared resistor.
6
Start the test.
7
Check that the measured resistance value matches the resistance of the prepared resistor
and the comparator judgment result is [PASS] .
Test Preparation
HIOKI BT5525A961-00