5878 • 5880 • 5882
11
Using the Features (cont’d)
5. Use the readings to calculate the DAR (dielectric absorption rate):
DAR = measurement after 1 minute
measurement after 30 seconds
6. Use the readings to calculate the PI (polarization index):
PI = measurement after 10 minutes
measurement after 1 minute
The following parameters indicate acceptable insulation:
DAR > 1.25
PI > 2
Note: The timed test will automatically shut off after 15 minutes.
Speaker
See the Indicator Table for information on the tones generated by the speaker.
To disable the speaker:
• Model 5878: Set the selector to 20 Ω, then press the yellow test button. The icon will
disappear from the display.
• Model 5880 and 5882: Press ALARM while turning the unit ON. The icon will not
appear on the display.
To enable the speaker on any model: Switch the unit OFF, then back ON.
Backlight
Press to turn on the backlight. Press again to turn off.
Note: The backlight will automatically shut off after 1 minute.
Automatic Power-Off
To extend battery life, the megohmmeter will shut itself off after approximately 5 minutes of
inactivity. To restore power, press any button or rotate the selector.
Models 5880 and 5882 only: To disable this feature, press and hold while turning the
power ON. The icon will appear on the display.
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