Fluke 1537-II - Polarization Index (PI)

11
Insulation Tester
Insulation Test Settings
Polarization Index (PI)
As part of the insulation test, the Tester measures and stores polarization index
(PI), when appropriate. A polarization index test requires 10 minutes to complete.
Therefore, the Tester will start a countdown at 10 minutes. When an insulation test
reaches 10 minutes, the polarization test is complete. The results are available for
display during a test or when you store the test results and view the record PI eld.
See Figure 4 .
The eld is identied by:
min1
min10
R
R
PI =
Figure 4. Polarization Index (PI)
1 2
2x = PI
10 min.
min1
min10
R
R
PI =