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Measuring Polarization Index and Dielectric Absorption Ratios
IRT807
Apo
SMOOTH
50V
Test Voltage
SELECT
MIN/MAX
RANGE
A-HOLD
F C
1000V
TEST
PI/DAR
ZERO
Temp
mV
V
kHz
mA
V
SMOOTH
OFF
• The High Voltage symbol warns if voltage of greater than 30V AC or DC is present. If High voltage is present, test is inhibited.
• Press and hold the TEST button on the Meter or the Remote Probe to start the test. During testing, the display shows the
test voltage applied to the circuit under test. The high voltage symbol along with display showing resistance in MΩ or GΩ, the
TEST icon appears on the lower portion of the display until the test is finished.
• To interrupt PI or DAR test before it is completed, press TEST button. When you release the TEST button, the circuit under
test will automatically be discharged through the tester.
LOCK
Features:
A-HOLD
TEST
NOTE: Measurements can be adversely affected by impedances of additional operating circuits connected in parallel or transient
currents.
CATIV 600V Measurement Locations
• Ensure the test lead shield is pressed firmly in place. Failure to use the CAT IV shield increases arc-flash risk.
CAT II Measurement Locations
• CAT IV shields may be removed for CAT II locations. This will allow testing on recessed conductors such as standard wall outlets.
Take care not to lose the shields.
WARNING: Test Lead category protections apply only to test leads and should not be confused with the meter's specific
CAT rating. Observe the maximum category protection indicated on the meter the test leads are plugged into.
PI/DAR
• Default =
LOCK
• Press x1 =
Hz
TEST
50V
1000V
• Default =
Test Voltage
RANGE
F C
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.
WARNING
• Insulation tests should only be performed on
de-energized circuits.
To measure polarization index or dielectric absorption ration;
• Use insulation and COM Input ports.
NOTE: Because of the time required to perform the PI and DAR
tests, use of alligator clips is recommended.
• Set rotary function dial to INSULATION position and press
RANGE button to select desired voltage.
• Press the PI/DAR button to select PI or DAR.
• The display shows "----" until TEST button is pressed
and a valid resistance is obtained.
PI/DAR
SELECT
Hz
Test Lead Notes
17
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