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Matco Tools MD79 Manual Del Usuario página 15

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14
Off is disabled automatically in this mode.
Relative-Zero ( ZERO) mode
Relative-Zero allows the user to offset the meter consecutive
measurements with the main display displaying reading as the
reference value. LCD " " turns on. Press the
ZERO (HOLD) button for one second or more to toggle Relative-Zero
mode.
DC-Zero mode is set instead of Relative-Zero mode, however, to only
offset the non-zero DCA residuals caused by magnetic hysteresis of
the jaws as in DCA & DC+ACA functions. Press the
ZERO (HOLD)
button for one second or more to activate/ re-activate this mode. Apply
this mode before making any single DCA or DC+ACA measurement for
best measuring accuracy. The meter shows "dc_0" shortly to confirm
activation before continuing measurements. The beeper will sound 3
short beeps, however, to warn for null activation if the residual is
beyond a reasonable hysteresis reading of -5 to 5 DCA.
80ms PEAK-RMS mode
Press PEAK-RMS button for one second or more to toggle PEAK-RMS
mode to capture inrush current or voltage RMS values in duration as
short as 80ms. LCD
turns on. Auto-Power-Off is 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.
Intelligent Auto-Power-Off (APO)
The Auto-Power-off (APO) mode turns the meter off automatically to
extend battery life after approximately 32 minutes of no specified
activities, where applicable:
1) Rotary switch or push button operations
2) Significant measuring readings of above 8.5% of ranges
3) Non-OL readings for Resistance, Continuity or Diode function
4) Non-zero readings for Hz function
5) Significant movement indication as in Phase Rotation functions

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