KYORITSU 3127 - Manual (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