The Highest, Lowest And Average Value; Differential Absorption Ratio (Dar) And Polarization Index (Pi) - Testboy TV 431 Manual De Instrucciones

Functional description

The highest, lowest and average value

When working in test mode, you can display the highest, lowest and average value using the SELECT button. When
working in data hold mode, you can display the values with the SELECT button.

Differential Absorption Ratio (DAR) and polarization index (PI)

There are cases in which no further intact isolation parts (which e.g. have lost their isolating effect under high voltage)
but which still present a good absorption ratio (or a good polarization index). The absorption ratio (polarization index)
can only be used to ascertain local isolation damage; they offer no indication as to dampness and contamination.
R 60 Sec
)
DAR (absorption ratio =
R 15 Sec
R 10 Min
PI (polarization index) =
R 1 Min
R10Min= resistance value measured 10 minutes after applying the test voltage; R1Min=R60Sec= resistance value
measured 1 minute after applying the test voltage; R15Sec= resistance value measured 15 seconds after applying the
test voltage
After completing the insulation test, press the SELECT button to display the DAR and PI values. Should the DAR and PI
values be invalid, the display will show - - - -.
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