23
24
9.3.1.3 Polarization Index Measurement
Polarization Index (PI) refers to the value of measured resistance in 10 minutes to
that in 1 minute. It takes 10 minutes to perform polarization index testing. If the time
of insulation testing is 10 minutes or more, polarization index testing is completed
and saved.
PI=
R
10min
R
1min
＞4
4～2
2～1
＜1.0
Polarization Index (PI)
Insulation condition
Very good
Good
Poor
Dangerous
Press “TIME” button under insulation resistance testing condition without high voltage
output. When the LCD shows PI, it indicates the tester enters polarization index
measurement mode.
Then, the LCD shows PI, Time1, Time2, timer symbol, etc. In initial interface, the
default time of Times is 1 minute, that is 01:00 (the mantissa flashes to indicate
user can set the parameter). The default time of Time2 is 10 minutes, that is 10:00.
After completing setting Time1, the tester by default switches to setting state of
Time2. Press “ENTER” to confirm and save the change, or press “ESC” to cancel
the change.
Press “TEST” to perform test, the LCD shows basic elements including battery power,
high-voltage warning symbol, leakage current, real-time output voltage, measured
insulation resistance (Time1 or Time2), testing value of analog bar graph, Time1 or
Time2, set countdown time, PI, storage capacity, etc.
When the set time is up, the test ends automatically, the testing indicator light turns
off, the tester discharges fast, and the LCD shows the testing value. Press and
to cyclically display PI, insulation resistance in Time2, and insulation resistance
in Time1.
9.3.1.4 Dielectric Absorption Ratio Measurement
Dielectric Absorption Ratio (DAR) refers to the value of insulation resistance in
1 minute to that in 15 seconds. It takes 1 minute to perform absorption ratio testing.
The measurement data of all insulation testing in less than 1 minute are deemed
invalid. If the time of insulation testing is 1 minute or more, the absorption ratio
testing is included in the result.
DAR=
R
1min
R
15s
＞1.4
1.25～1.0
＜1.0
Dielectric Absorption Ratio (DAR)
Insulation condition
Very good
Good
Dangerous
Press “TIME” button under insulation resistance testing condition without high
voltage output. When the LCD shows DAR, it indicates the tester absorption ratio
measurement mode.
Then, the LCD shows DAR, Time1, Time2, timer symbol, etc. In initial interface,
the default time of Time1 is 15 seconds that is 00:15 (the mantissa flashes to
indicate user can set the parameter). The default time of Time2 is 1 minute that
is 01:00. After completing setting Time1, the tester by default switches to the
setting state of Time2. Press “ENTER” to confirm and save the change, or press
“ESC” to cancel the change.
Press “TEST” to perform test, the LCD shows basic elements including battery
power, high-voltage warning symbol, leakage current, real-time output voltage,
measured insulation resistance (Time1 or Time2), testing value of analog bar
graph, Time1 or Time2, set countdown time, DAR, storage capacity, etc.
When the set time is up, the test ends automatically, the testing indicator light
turns off, the tester discharges fast, and the LCD shows the testing value.
Press and to cyclically display DAR, insulation resistance in Time2, and
insulation resistance in Time1.
UT512D/E User Manual
UT512D/E User Manual
