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7. Declaration DAR and PI
DAR: Dielectric absorption ratio
The dielectric discharge test makes statements about self-
discharge and is also used for capacitors. In electrical systems and
devices with insulating materials, it can happen that the dielectric
absorption current decreases rapidly. Using this measurement, it is
possible to determine the insulation resistance of the test object by
two measurements, which are carried out using the DAR principle.
A measurement is made after 30 and 60 seconds.
The calculation of the DAR is as follows:
DAR = Insulation resistance after 60 seconds / Insulation resistance
after 30 seconds
DAR value
Insulation quality
<1,25
poor
<1,6
OK
>1,6
Very good
The value of the DAR has no unit.
