Insulation Multimeter
Basic Measurements
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Figure 9. Testing Insulation
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.
Insulation tests should only be performed on de-energized
circuits. To measure the polarization index or dielectric
absorption ratio:
1. Insert test probes in the
p and q input terminals.
Note
Because of the time required to perform the PI and
DAR tests, use of test clips is recommended.
2. Press r repeatedly to select the test voltage.
3. Press g to select polarization index or dielectric
absorption ratio.
4. Connect the probes to the circuit to be measured. The
Tester automatically detects if the circuit is energized:
• The primary display shows ---- until you press the
g button and a valid resistance reading is
obtained.
• The high voltage symbol (Z) and a primary display
of >30 V warns if voltage greater than 30 V ac or
dc is present. If high voltage is present, the test is
inhibited.
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