Interpretation Of The Results - AEMC 6550 User Manual

Use the ▲▼ arrow buttons to select DAR or PI.
Total Run Time
Manual Stop
Manual Stop + DD
Timed Run (m:s)
Timed Run + DD
DAR (s/s)
PI (m/m)
Press the CONFIG button to exit the configuration menu.
DAR or PI is displayed in the top left corner of the display unit to indicate the configuration chosen.
Press the START/STOP button to start the measurement. It stops automatically and the values of DAR and PI
are displayed.

4.6.2 Interpretation of the Results

DAR
DAR < 1.25
1 ≤ PI < 2
1.25 ≤ DAR < 1.6 2 ≤ PI < 4
1.6 ≤ DAR 4 ≤ PI
A capacitance in parallel to the insulation resistance extends the settling times of the measurements. This can
affect or even inhibit the measurement of DAR or PI (depending on the time set for recording the first resistance
value). The table below indicates the typical values of the capacitances in parallel with the insulation resistance,
making it possible to measure the DAR and the PI without changing their preset durations.
100kW
500V 10µF
1000V 5µF
2500V 2µF
5000V 1µF
10,000V 0.5µF
15,000V 0.3µF
Megohmmeter Models 6550/6555
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CONFIG
00:01:00
2:00
30/60
1.0/10
PI Condition of insulation
PI < 1
Poor or even dangerous
Good
Excellent
1MW 10MW
10µF 10µF
5µF 5µF
2µF 2µF
1µF 1µF
0.5µF 0.5µF
0.3µF 0.3µF
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Total Run Time
Manual Stop
Manual Stop + DD
Timed Run (m:s)
Timed Run + DD
DAR (s/s)
PI (m/m)
100MW 1GW
6µF 4µF
3µF 2µF
1.2µF 1µF
0.6µF 0.4µF
0.3µF 0.2µF
0.2µF 0.1µF
.ca
CONFIG
00:10:00
2:00
30/60
1.0/10
10GW 100GW
2µF 1µF
1µF 0.5µF
0.5µF 0.2µF
0.3µF 0.1µF
0.1µF 0µF
0.1µF 0µF
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