Amprobe DM78C Digital-Pocket-Multimeter User Manual
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MAINtENANCE
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Warning
to avoid electrical shock, disconnect the meter
from circuit and turn oFF the meter before
opening the case. Do not operate the meter
with open case.
trouble Shooting
if the instrument fails to operate, check
batteries and test leads etc., and replace as
necessary. Double check operating procedure as
described in this user’s manual. The voltage and
resistance measurement circuits are protected
by fusible resistors and a parallel high resistance
path. if the instrument voltage-resistance input
terminal has been subjected to high voltage
transients (caused by lightning or switching
surges in the system), the series fusible input
resistors will open like fuses and the voltmeter
will read approximately 85% of the actual value
and cause the resistance range to not work.
The meter voltage reading (approximately 5%
low) will let the user know that the meter has
been damaged, and the circuit under test is
active. Refer to the liMiTED wARRAnTY section
for obtaining warranty or service.
Cleaning and Storage
Periodically wipe the case with a damp cloth
and mild detergent; do not use abrasives or
solvents. if the meter is not to be used for
periods of longer than 60 days, remove the
battery and store separately.