Maintenance - Brymen BM905s User Manual

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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.
Accuracy and Calibration
Accuracy is specified for a period of one year after calibration. Periodic calibration at
intervals of one year is recommended to maintain meter accuracy. If self-diagnostic
message "C_Er" is being displayed while powering on, some meter ranges might be
largely out of specifications. To avoid mis-leading measurements, stop using the meter
and send it for re-calibration. Refer to the LIMITED WARRANTY section for obtaining
calibration, repairing or warranty 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 batteries and store them separately
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.
If the instrument voltage-resistance input terminal has subjected to high voltage
transient (caused by lightning or switching surge to the system under test) by accident
or abnormal conditions of operation, the protective impedance components in series
might be blown off (become high impedance) like fuses to protect the user and the
instrument. Most measuring functions through this terminal will then be open circuit.
Such components should then be replaced by qualified technician. Refer to the
LIMITED WARRANTY section for obtaining warranty or repairing service.