Rae QRAE PLUS PGM-2000, Operation & Maintenance Manual

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OPERATION
2-17
2.4. Backlight
The display is equipped with an LED backlight to assist in
reading the display under poor lighting conditions. In Manual
mode, this backlight can be turned on
manually by holding the
[N/-] key for one second in normal operation. The backlight can
be turned off by pressing [N/-] a second time. If the [N/-] key is
not pressed, the backlight will turn off automatically after a pre-
programmed time-out period to save power.
In Automatic mode, the ambient light is sensed and the
backlight will turn on
automatically if the ambient light is below
a threshold level. The backlight will then turn off automatically
when the ambient light exceeds the threshold level.
See Chapter 4 for details on how to set the backlight mode and
time out period from either the monitor or from a PC. See
Chapter 8 for details on how to set the ambient light threshold
level.
Note: The LED backlight consumes a higher amount of power
from the battery and shortens the operating time of the monitor
by 10 - 20%.