6
2. Turn on the instrument to check the actual measured voltage, and the instrument can
automatically distinguish between DC and AC.
3. Regardless of whether it is DC or AC, if it exceeds 10V, check again whether the circuit
breaker under test is disconnected.
● Measure the absorption ratio DAR:
4. Choose a measurement time longer than 1 minute
5. Select the appropriate voltage and start.
6. The instrument automatically records the resistance values of 15S and 60S, and
calculates the absorption ratio after 60 seconds.
Absorption ratio calculation method: DAR= R60/R15;
● Measure polarization index PI:
1. Choose a measurement time longer than 10 minutes
2. Select the appropriate voltage and start.
3. The instrument automatically records the resistance values of 15S, 60S, and 600S,
and calculates the polarization index after 600 seconds.
Polarization index calculation method: PI= R600/R60;
● DD test
This test is suitable for the diagnosis of multilayer insulation. It is a good way to judge the
defects in multilayer insulated objects by measuring the discharge current value and the
capacitance value of the measured object 1 minute after the completion of the test.
DD value = current value (mA) 1 minute after the test is completed / voltage value (V)
when the test is completed / capacitance value (F)
DD
值
2.0
以下
2.0
～
4.0
4.0
～
7.0
7.0
以上
判定
良好
警告
差
最差
This criterion is the target value, and may require users to adjust or change the test
method developed for testing the high-voltage generators of European power stations.
● Precautions for test wiring
1. Confirm that the tested product is safely grounded, and the tested product is not live.
2. Confirm that the E terminal (grounding terminal) of the meter is grounded.
