Kyoritsu 3127 User Manual download pdf (Page 25)

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(2) Setting procedures

Follow the procedures below

[Stand-by state]

ENTER button( )

Setting of Measurement duration (with UP/DOWN button ( ))

ENTER button ( )

Setting of Output voltage*1 (with UP/DOWN button ( ))

ENTER button ( )

Setting of Breakdown/Burn (with UP/DOWN button ( ))

ENTER button ( )

Setting is ﬁnished.

(*1): 500V/2500V/5000V Range only

6-5-1 PI – Polarization index

This is to check a temporal increase of leakage currents ﬂowing on insulations

and to conﬁrm leakage currents aren’t increased as time passes.

PI is usually determined by the insulation resistances measured 1 min and 10

min after a measurement is started. PI is dependent on the shape of insulations

and inﬂuenced by moisture absorption, therefore, a check of PI is important to

diagnosis the insulation of cables.

PI =

Insulation resistance

(10 min after a start of test)

Insulation resistance

(1 min after a start of test)

PI 4 or more 4 - 2 2.0 - 1.0 1.0 or less

Criteria Best Good Warning Bad

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Kyoritsu 3127 User Manual Page 25