REED ST-9919 Manuel D'utilisation page 16

Relative Mode
The relative measurement feature allows you to make measurements
relative to a stored reference value. A reference voltage, current, etc.
can be stored and measurements made in comparison to that value.
The displayed value is the difference between the reference value and the
measured value.
Note: Relative mode does not operate in the 4-20mA function.
1. Perform the measurement as described in the operating instructions
2. Press the REL button to store the reading in the display and the "REL"
indicator will appear on the display
3. The display will now indicate the difference between the stored value
and the measured value
4. Press the REL button to exit the relative mode
Display Backlight
Press the HOLD/
The backlight will automatically turn off after 10 seconds.
Hold
The hold function freezes the reading in the display. Press the HOLD key
momentarily to activate or to exit the HOLD function.
Peak Hold
The Peak Hold function captures the peak AC or DC voltage or current.
The meter can capture negative or positive peaks as fast as 1 millisecond
in duration. Momentarily press the PEAK button, "PEAK" and "MAX" will
display. The meter will update the dispay each time a higher positive peak
occurs. Press the PEAK button again, "MIN" will display. The meter will
update the dispay each time a lower negative peak occurs. Press and
hold the PEAK button for more than 1 second to exit PEAK Hold mode.
Auto Power Off feature will be disabled automatically in this mode.
key for >1 second to turn the backlight on.
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