Owner manual

KEW3128 53
KEW3128 6. Measurement
6. 5 DAR Measurement (Dielectric Absorption Ratio)
6.5.1 Dielectric Absorption Ratio
DAR : Dielectric Absorption Ratio
DAR measurement is almost same to PI measurement in a sense that
they test the time course of insulation. The only difference is that DAR
measurement can get result faster than the other.
Dielectric
Absorption
Ratio
=
TIME2
Insulation resistance value 30 sec or 1 min
after starting measurement
TIME1
Insulation resistance value 15 or 30 sec
after starting measurement
DAR 1.4 or more
1.25 ～ 1.0
1.0 or less
Criteria Best Good Bad