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8-6 DAR/ PI measurement, 1-min value display (KEW3552/3552BT only)
8-6-1 DAR/ PI measurement and 1-min value display
The instrument can measure and calculate DAR (Dielectric Absorption Ratio)
and PI (Polarization Index) values automatically during an insulation resistance
measurement. (not available on KEW3551)
● T he DAR value is displayed in 1 minute and the PI value in 10 minutes
after starting a measurement.
● The following table shows the formula and display range.
Resistance value (1 min after a start of test)
DAR =
Resistance value (15 sec after a start of test)
Formula
Resistance value (10 min after a start of test)
PI =
Resistance value (1 min after a start of test)
Display range
* I f a denominator, the measured resistance, used in the above formula is 0
MΩ; the LCD shows no for DAR/ PI value. When the calculated DAR/PI
values exceed the display range, the LCD shows >9.99 .
8-6-2 Indication
Press the cursor key, in 1 min. after starting a measurement, to check 1-min
value or DAR/ PI values. (Please wait at least 10 min. to check PI value.)
The following indications show what value is currently displayed.
● 1-min value:
"
"symbol and the
measured value.
● DAR value:
"
symbol and the DAR value.
"
● PI value:
"
"
symbol and the PI value.
̶ 29 ̶
www.calcert.com
15
10
20
5
25
0
30
0.00 - 9.99
Fig. 8-22
Fig. 8-23
Fig. 8-24
sales@calcert.com
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