Brymen BM857 User Manual page 13

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µA, mA, A, and %4-20mA Current functions
Insert the red test lead into the correct µA/mA or A input jack. Press SELECT button
momentarily to select DC, AC, or DC+AC. The new settings will be saved automatically
to the non-volatile memory as power up default. In DC mA function, neither in AC nor in
DC+AC, press and hold the %4-20mA ( Hz) button for 1 second or more to display
the current digital data in terms of loop current percentage (%) value. It is set at 4mA =
0% (zero) and 20mA = 100% (span) with 0.01% high resolution, which virtually extends
the meters' capability to test and regulate the externally powered loop current in the
industrial process control applications. The analog bar-graph remains the mA current
value to alert the user.
Warning: When measuring a 3-phase system, special attention should be taken to the
phase to phase voltage which is significantly higher than the phase to earth voltage. To
avoid exceeding the voltage rating of the protection fuse(s) accidentally, always
consider the phase to phase voltage as the working voltage for the protection fuse(s).
RS232C PC computer interface capabilities
The instrument equips with an optical isolated interface port at the meter back for data
communication. Optional purchase PC interface kit BR85X (BC85X RS232C optical
adapter cable + BS85X RS232C software floppies) is required to connect the meter to
the PC computer. The BS85X RS232C Data Recording System software equips with a
digital meter, an analog meter, a comparator meter, and a Data Graphical recorder
display. Refer to the README file in the interface kit for further details.