Brymen BM252 User Manual page 10

9
*Note: 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).
Electric Field EF-Detection
At Volt or Current function, press the EF button for one second or more and release to toggle to EF-
Detection feature. The meter displays "E.F." when it is ready. Signal strength is indicated as a series
of bar-graph segments on the display plus variable beep tones.
●Non-Contact EF-Detection: An antenna is located along the top-right end of the meter, which
detects electric field surrounds current-carrying conductors. It is ideal for tracing live wiring
connections, locating wiring breakage and to distinguish between live or earth connections.
●Probe-Contact EF-Detection: For more precise indication of live wires, such as distinguishing
between live and ground connections, use the Red (+) test probe for direct contact measurements.
PC computer interface capabilities
The instrument equips with an optical isolated interface port at the meter back for data
communication. Press HOLD button while turning the meter on to enable meter PC-COMM output.
Optional purchase PC interface kit BRUA20X is required to connect the meter to the PC computer
RS232 or USB ports.
MAX/MIN at Fast 20/s measurement mode (model 257 & 255 only)
Press REC button momentarily to activate MAX/MIN recording mode. The LCD "MAX MIN" turn on,
and the reading update rate will be increased to 20/second. The meter beeps when new MAX
(maximum) or MIN (minimum) reading is updated. Press the button momentarily to read the MAX
and MIN readings in sequence. Press the button for 1 second or more to exit MAX/MIN recording
mode. Auto-ranging remains, and Auto-Power-Off is disabled automatically in this mode.
5ms CREST capture mode (model 257 & 255 only)