Amprobe DM78C User Manual - Page 11

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MAINtENANCE

� 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.

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.

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.