Trifitek TR-79, Руководство пользователя, Страница: 38 / 46

15
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.
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 open fuses to protect the user and the
instrument. Most measuring functions through this terminal might then be open circuit.
Such components should only be replaced by qualified technician. Refer to the
LIMITED WARRANTY section for obtaining warranty or repairing service.
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. 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.
Battery replacement
The meter uses standard 1.5V AAA Size (IEC R03) battery X 2
Loosen the 2 captive screws from the battery cover case. Lift the battery cover case.
Replace the batteries. Replace battery cover case. Re-fasten the screws.