Vanguard IRM-5000P - Manual (Page 26)

IRM-5000P USER’S MANUAL REV 2
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3.1.3. Performing a Polarization Index Ratio (PI) Test
The polarization index (PI) is derived from the ratio of the insulation resistance at ten minutes
divided by the insulation value at one minute. For a typical insulation, the resistance value
increases as time increases during a test.
Standard voltages of 500 V, 1000 V, or 5000 V can be used, or the user can enter a custom test
voltage value from 50 V to 5000 V. The default test duration is ten minutes, but a custom test
duration can be set from 10 to 99 minutes. Follow the steps below to perform a PI test:
a. Start from the “Start-Up” menu:
Press the [1] key (RUN TEST).
b. The following screen will be displayed:
Press the [2] key (PI).
c. The following screen will be displayed:
1. 10 Min (Default)
Press the [1] key to select the default test duration of 10 minutes. Continue to
step d.
2. Custom
Press the [2] key to enter a custom test duration (between 10 to 99 minutes).
The following screen will be displayed:
Press the [ENTER] key to continue.
NON-STANDARD Time?
“ENTER” to continue
TERMINAL VTG: 1 V
1. 10 Min (Default)
2. Custom
TERMINAL VTG: 1 V
1. R 2. PI
3. DD 4. SV
TERMINAL VTG: 1 V
1. RUN TEST 05/05/10
2. UTILITIES 10:10:15
Bat:
TERMINAL VTG: 1 V