Iso-Tech IIT 1500 - Page 15

14
IIT 1500 English
Measuring PI/DAR
Press ≥ 2Sec
Press ≥ 2Sec
2
1
Press
3
2
1
M
100Gk
100M
100kM
10Gk
100k
0
10M
DC
V
M
100Gk
100M
100kM
10Gk
100k
0
10M
DC
V
LOCK
PI/DAR
PI
Press ≥ 2Sec
Press
2
3
1
M
100Gk
100M
100kM
10Gk
100k
0
10M
DC
V
DAR
PI(Polarization Index) = R10-min/R1-min
DAR(Dielectric Absorption Ratios) = R1-min/R30-sec
Where:
R10-min: the insulation resistance measured at 10 minutes after pressing the
TEST button.
R1-min: the insulation resistance measured at 1 minute after pressing the
TEST button.
R30-sec: the insulation resistance measured at 30 seconds after pressing the
TEST button.
If the reading for DAR is higher than 1.3 or PI is higher than 2, this indicates a
good level of insulation quality.
When the measured resistance is higher than the maximum range, the screen
will display “Err” symbol for PI/DAR value.
TEST button: Press once to start/interrupt the PI /DAR test.
Blue button: Press once during the PI/DAR test to display the remaining time of
the test.