TOS93 Series User’s Manual 327
Appendix | Example of partial discharge test
2
Obtain a capacitor with the same level of impedance as the EUT and that does not
produce partial discharge at the maximum test voltage.
If you cannot obtain this capacitor, use an EUT that does not produce partial discharge. If the
appropriate EUT cannot be obtained, do not use any EUT.
3
Use the capacitor you obtained as the EUT, and perform an electric charge
calibration .
If you are not using an EUT, leave the test leads open.
For details on electric charge calibration, see “Precalibration”
(p.127).
4
After electric charge calibration, set the following test conditions.
For the procedure to set test conditions, see “Set test conditions” (p.108).
5
Press START.
The test starts.
6
As a result of the test, check that the maximum partial discharge electric charge is
no more than 5 pC.
If a pass judgment is made, the inspection is complete.
Test condition Setting
Test Voltage
The voltage determined in “Maximum application voltage” (p.326).
Voltage Pattern Ramp
Frequency 50 Hz
Upper Coulomb 50 pC (≤ 100.0 pC)
Upper Pulse Count OFF
Test Time 2 s
Rise Time 10 s
Fall Time 10 s
2nd Test Time OFF
Range 100 pC
Inception Voltage 10 pC (≤ 100.0 pC)
Extinction Voltage 10 pC (≤ 100.0 pC)
If “PASS” is not displayed, check the following, and perform the test again.
• If there is dust or stain on the EUT, clean it.
• If the TOS9301PD is not grounded, connect it properly.
• If
the temperature and humidity are off from 23 °C and 50 % by great amounts, regulate
the environment using air conditioners and the like.
• If there are noise sources nearby, remove them.
• If there are noise sources in the same power supply line, take measures such as removing
them or changing to another power supply line.
• After taking the measures above, repeat the test several times.
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