Field glossary
Polarization index (PI)
Ratio of the 10-minute to the 1-minute reading; above about 2 is commonly good
Used across 3 Anvilfield field guides, most in Electrical.
Also defined as
- Datacenter: Ratio of the ten-minute to the one-minute IR reading; a rising ratio indicates dry, sound insulation
- Ratio of the 10-minute to the 1-minute insulation resistance reading
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