Elma BM 251s-257s
side 29
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 RS232 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
Press REC button momentarily to activat
e 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
Press CREST button momentarily to activate CREST (Instantaneous Peak-Hold) mode to capture
voltage or current signal duration as short as 5ms. The LCD “C” & “MAX” turn on. 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 CREST capture mode.
Auto-ranging and Auto-Power-Off are disabled automatically in this mode.
Backlighted LCD display
Press the SELECT button for 1 second or more to toggle the LCD backlight. The backlight will also be
turned off automatically after 32 seconds to extend battery life.
Hold
The hold feature freezes the display for later view. Press the HOLD button momentarily to toggle the hold
feature.
Relative Zero mode
Relative zero allows the user to offset the meter consecutive measurements with the displaying reading
as the reference value. Practically all displaying readings can be set as relative reference value including
MAX/MIN feature readings. Press the REL button momentarily to toggle relative zero mode.
Manual or Auto-ranging
Press the RANGE button momentarily to select manual-ranging, and the meter will remain in the range it
was in, the LCD
turns off. Press the button momentarily again to step through the ranges. Press
and hold the button for 1 second or more to resume auto-ranging.
Note: Manual ranging feature is not available in Hz and
functions.
Set Beeper Off
Press the RANGE button while turning the meter on to temporarily disable the Beeper feature. Turn the
rotary switch OFF and then back on to resume.
Beep-
Jack™ Input Warning
The meter beeps as well as displays “InEr” to warn the user against possible damage to the meter due to
improper connections to the
A, mA, or A input jacks when other function (like voltage function) is
selected.
Auto-Power-Off (APO)
The Auto-Power-Off (APO) mode turns the meter off automatically to extend battery life after
approximately 34 minutes of no rotary switch or push button operations. To wake up the meter from APO,
press the SELECT, CREST or REC button momentarily or turn the rotary switch OFF and then back on.
Always turn the rotary
switch to the OFF position
when the meter is not in use
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