METREL MD 9070 Manuel D'utilisation page 17

MD 9070 Insulation/Continuity Digital Multimeter
PI/DAR mode
PI (Polarization Index) is the ratio of the 10-minute insulation resistance to the 1-minute
insulation resistance.
DAR (Dielectric Absorption Ratios) is the ratio of the 1-minute insulation resistance to
the 30-second insulation resistance.
A general guide to interpret the PI or DAR test results are:
Insulation
Condition
Dangerous
Questionable
Good
Excellent
Press the PI/DAR button momentarily to enable PI mode with the LCD annunciator
turned on. Press momentarily again toggles to the DAR mode with the LCD annunciator
turned on. The secondary display shows the measuring lap times of 10'00" and
01'00" for PI and DAR modes respectively.
Then, activate Lock-Test mode
measurements. The timer on the secondary display started to count down. The primary
display shows the real-time resistance readings until the timer shows 00'00" for a result.
The maximum display result is "5,0", and the display shows "> 5,0" for results beyond
that. If the measured resistance reading is over-range, the meter will stop
display "Err". Press the PI/DAR button for 1 second or more to exit.
PI (Polarization
Index)
< 1,0
< 2,0
< 4,0
> 4,0
&
17
DAR (Dielectric
Absorption Ratios)
-
< 1,3
< 1,6
> 1,6
to start PI or DAR count-down
Operation
and