Line Frequency Setup; Pc Computer Interface Capabilities; Maintenance; Trouble Shooting - Brymen BM157 User Manual

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Line Frequency setup

Press-and-hold the Hz button while powering the meter on. LCD displays the last 50Hz
or 60 Hz setup. Press SELECT button momentarily to select 50Hz or 60Hz to cope with
your local line frequency. Press Hz button for one second to store your selection and
resume measurements. Incorrect line frequency setup will introduce errors to THD%.

PC computer interface capabilities

The instrument equips with an optical isolated data output port at the bottom case near
the battery compartment. Optional purchase PC interface kit BRUA-13X (including
BA-1XX Optical Adapter Back, BC-100R Cable, BUA-2303 USB-to-Serial adaptor & Bs
software/driver CD) is required to connect the meter to PC computer USB port. The
Data Recording System software equips with a digital meter, an analog meter, a
comparator meter, and a Data Graphical recorder. Refer to the README file comes
with the interface kit for further details.

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) 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 terminal will then be open circuit. The series fusible resistors and
the spark gaps should then be replaced by qualified technician. Refer to the LIMITED
WARRANTY section for obtaining warranty or repairing 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