Amprobe AM91RS Digital-Multimeter - Manual (Page 21)

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feature.
Input warning
The meter beeps as well as displays “InErr” to warn the user against possible damage to
the meter due to improper connections to the
µ A, mA, or A input jacks when other
function (like voltage function) is selected.
Line filter frequency selection
Press the 40000 button while turning the meter on to display the set frequency. Press the
SELECT button for 50Hz or press the STORE button for 60Hz to cope with your power
line frequency. Then press the RANGE button to store the selected frequency. Selecting
the appropriate line filter frequency can maximize the meter’s noise rejection ability.
Set Beeper Off
Press the SELECT button while turning the meter on to disable the Beeper feature. This
does not disable the input warning beeper.
5) MAINTENANCE
WARNING
To avoid electrical shock, disconnect the meter from any circuit, remove the test leads
from the input jacks and turn OFF the meter before opening the case. Do not operate
with open case. Install only the same type of fuse or equivalent
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 it separately
Trouble Shooting
If the instrument fails to operate, check battery, fuses, leads, etc., and replace as
necessary. Double check operating procedure as described in this user’s manual
If the instrument voltage-resistance input terminal has subjected to high voltage transient
(caused by lightning or switching surge to the system) by accident or abnormal conditions
of operation, the series fusible resistors will be blown off (become high impedance) like
fuses to protect the user and the instrument. Most measuring functions through this