Insulation Tester
14
e. Measuring PI / DAR:
Polarization Index (PI) is the ratio of the 10-minute insulation resistance to the 1
-minute insulation resistance.
Dielectric Absorption Ratio (DAR) is the ratio of the 1-minute insulation resistance to
the 30 second insulation resistance.
i.Turn the rotary switch to the desired test voltage.
ii.
Press the
button to select polarization index or dielectric absorption ratio.
iii.Press
button to start the test. During testing, the primary
display shows the measured resistance and the secondary
display shows the test voltage applied to the circuit under test.
When the test is completed, the PI or DAR value is displayed on the primary display.
If either value used to calculate PI or DAR was greater than the maximum measuring
range, the primary display will show
“
Err
” for PI or DAR value.
Because of the time required to perform the PI and DAR tests, use of test clips is
recommended.
To interrupt a PI or DAR test before it is completed, momentarily press
.
Warring!
To avoid electrical shock or injury, remove the test leads and any input signals
before replacing the fuse.
(3) Turn the rotary switch to the
position.
(4) Press and hold
. If the
display reading is
“
”, the
fuse is bad and should be replaced.
5. TESTING FUSE
Summary of Contents for Sefram MW9092
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