10
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. 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 (model 257 & 255 only)
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
Disabling Auto-Power-Off
Press the SELECT button while turning the meter on to temporarily disable the Auto-Power-Off
(APO) feature. Turn the rotary switch OFF and then back on to resume.
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. Install
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