20
®
COMPARE mode
This mode uses a preset insulation resistance threshold value for
PASS/FAIL measuring comparison. The LCD annuciator turns
on when the reading is higher than the selected threshold
value. On the contrary, the LCD annuciator turns on and the
meter chirps when the reading is below such value.
PASS
TEST
FAIL
TEST
To enable, press the
COMPARE
button momentarily. The LCD
annuciator turns on. Press the
COMPARE
button momentarily
again to select the preset threshold values in sequence. Last
threshold values selected for each test voltage range will be saved
separately as power up default for repeat measurement conven-
ience. Press the
COMPARE
button for 1 second or more to exit.
C
NOTE. Selectable threshold values for the test voltage ranges are
100k
W
/ 200k
W
/ 500k
W
/ 1M
50V & up. Additional 100M
W
for 100V & up, 200M
W
for 250V & up
and 500M
W
for 500V & 1000V ranges.
W
/ 2M
W
/ 5M
W
/ 10M
W
/ 20M
W
/ 50M
W
for
TEST
R
H
HOLD
REC
INSULATION
PI/DAR
SELECT
RANGE
COMPARE
ZERO
LOCK
JACK
INS.
COM
INS.
W
V
200mA
MAX
1000V CAT III
600V CAT IV
INSULATION
HBC FUSED
( 0.25A )
HBC FUSED
( 0.4A )
INSULATION
50V
100V 250V 500V
1kV
200mA
W
V
V
Hz
OFF
VFD
C
M
W
500 V
W
M
20M
W
C
1
COMPARE
TEST
R
H
HOLD
REC
INSULATION
PI/DAR
SELECT
RANGE
COMPARE
ZERO
LOCK
JACK
INS.
COM
INS.
W
V
200mA
MAX
1000V CAT III
600V CAT IV
INSULATION
HBC FUSED
( 0.25A )
HBC FUSED
( 0.4A )
INSULATION
50V
100V 250V 500V
1kV
200mA
W
V
V
Hz
OFF
VFD
C
M
W
500 V
W
M
50M
W
C
1
COMPARE
®
21
TEST
R
H
HOLD
REC
INSULATION
PI/DAR
SELECT
RANGE
COMPARE
ZERO
LOCK
JACK
INS.
COM
INS.
W
V
200mA
MAX
1000V CAT III
600V CAT IV
INSULATION
HBC FUSED
( 0.25A )
HBC FUSED
( 0.4A )
INSULATION
50V
100V 250V 500V
1kV
200mA
W
V
V
Hz
OFF
VFD
C
M
W
500
V
PASS
W
M
TEST
C
TEST
flash
PASS
Press
& Hold
TEST
+
TEST
Press
& Hold
TEST
R
H
HOLD
REC
INSULATION
PI/DAR
SELECT
RANGE
COMPARE
ZERO
LOCK
JACK
INS.
COM
INS.
W
V
200mA
MAX
1000V CAT III
600V CAT IV
INSULATION
HBC FUSED
( 0.25A )
HBC FUSED
( 0.4A )
INSULATION
50V
100V 250V 500V
1kV
200mA
W
V
V
Hz
OFF
VFD
C
M
W
500
V
W
M
TEST
C
TEST
flash
Press
& Hold
TEST
+
TEST
Press
& Hold
FAIL
FAIL
PI/DAR mode
PI
(
P
olarization
I
ndex) is the ratio of the 10-minute insulation resistance
to the 1-minute insulation resistance.
PI=
R
(10-min)
R
(1-min)
DAR
(
D
ielectric
A
bsorption
R
atios) is the ratio of the 1-minute insulation
resistance to the 30-second insulation resistance.
DAR=
R
(1-min)
R
(30-sec)
A general guide to interpret the PI or DAR test result are:
Insulation Condition
PI (Polarization Index)
DAR (Dielectric Absorption Ratios)
Dangerous
Questionable
Good
Excellent
<1.0
<2.0
<4.0
>4.0
-
<1.3
<1.6
>1.6
Press the
PI/DAR
button momentarily to enable PI mode with the LCD
annunciator turned on. Press momentarily again toggle 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.
PI
DAR
