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Discuss PI / DAR button on Insulation Tester in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

D

DanBrown

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:)Guys, a bit of advice please
I have the FLUKE 1507 insulation tester, and has a button on saying PI / DAR.. Does anyone know what this is for, as it does a constant Insulation Test over a period of 10 minutes, and was curious to what it can be used for.
Thanks
 
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D

DanBrown

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  • #2
Take it its not only me baffled by this button then lol.:)
 
G

Guest123

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  • #3
Hi Dan.

I found this, dont know if it's of any use to you.

Cheers.

Polarisation index ‘PI’ test, and dielectric absorption ratio ‘DAR’ test
The ‘PI’ test is a particular example of a time/resistance method, which takes the ratio of the insulation measured at 1 minute and at 10 minutes.
Good insulation generally shows an increase in resistance over a 10 minute period. Readings for contaminated insulation are fairly constant because any absorption effects are masked by high leakage currents. On completion of the test the polarisation index is displayed under the segment heading ‘PI’.
Polarisation Index (PI) = R10 min
R1 min
The ‘Dielectric Absorption Ratio’ is the term applied to the polarisation index using other time intervals set by T1 and T2.
If timers T1 and T2 are both set, then the insulation resistance measured at these times is also recorded. These are displayed together with the calculated dielectric absorption ratio under the T1, T2, and DAR segments respectively.
The instrument can be made to display either the insulation resistances, insulation currents or ratios plus capacitance measurements by using the toggling units.
Dielectric Absorption Ratio (DAR) = RT2 min
RT1 min
 
D

DanBrown

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  • #4
Thanks Lenny for the information, although i don't think this PI / DAR button is for me. :rolleyes: lol
 
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