Data Hold; Timer - AEMC 1020 User Manual

Data Hold

Will hold last measured value in memory when the Data Hold position
is in the "ON" position. NOTE: You must hold down the yellow test
button to keep the value displayed. The value in memory will still be
displayed if leads are disconnected as long as the yellow test button
is depressed.

Timer

The instrument may be used in a "hands-free operation" by moving
the timer switch to the three minute position and then pressing the
yellow test button. If the yellow test button is pressed when the switch
is in the three minute position it will shut the instrument off. NOTE:
After three minutes all data will be lost! If a DAR (Dielectric Absorption
Ratio) test is performed the user will have to record the value after 30
seconds and 60 seconds.
Insulation resistance @ 60s
= Dielectric Absorption Ratio (DAR)
Insulation resistance @ 30s
CAUTION: The timer will keep the output leads energized for three
minutes. After three minutes the display will go blank and all mea-
sured data will disappear.
This instrument was not designed to perform a Polarization Index (PI)
Test because the test voltage cannot be locked for 10 minutes. If a PI
Test is required, the user will have to hold down the test button and
record the readings at 1 minute and 10 minutes.
Insulation resistance @ 10 min
= Polarization Index (PI)
Insulation resistance @ 1 min
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Megohmmeter Models 1020 and 1025