Polarization Index (Pi); Dielectric Absorption Index (Dai) - TENTECH MD1035x Manual De Uso

6.1. Polarization index (PI)

The  key makes it possible to visualize the Polarization Index value on
the display. For this type of test, the equipment must be connected and
applying voltage to the sample for 10 minutes. After this period, the
operator must press the  key to show the PI value on the instrument
display.
If the key is pressed before the 10-min period has elapsed, the display will
show PI= - - -. The polarization index is the ratio between the insulation
resistance value measured after 10 min and the value measured after 1
min. This index is useful to determine whether it is necessary to perform
preventive and predictive Maintenance in order to detect any insulation
resistance wear and tear due to the excess of dust, dirt, grease, or else
the action of chemical or physical agents, etc.

6.2. Dielectric Absorption Index (DAI)

The  key makes it possible to visualize the Dielectric Absorption Index
value on the display. For this kind of test, the equipment should be
connected, applying voltage to the sample for 60 seconds. After this
period, the operator must press the  key to read the absorption index
value on the display.
R
10 minutes
PI
=
R
1 minute
20