Larson Davis System 824, Reference Manual

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3-8 824 Reference Manual 11/8/00
Extra Notes on Power Conservation
NOTE: To exit the Power display, press
the left
l
arrow key or use the view
key to the select desired view.
If you are using an external power supply, the
v
key will
display the constant voltage coming from the power supply.
If the external battery supply ever drops below 10.8 Volts,
set by the Min Battery setting, the 824 will automatically
turn off. Discharging some types of batteries (such as lead
acid) deeply will greatly shorten their service life.
WARNING!
Battery life is reduced by approximately 25% with the back-
light on.
LCD Contrast 0 - 99%
(The default contrast
setting is 66%) Adjusts the contrast or viewing angle of the LCD
display. This is done by pressing either the up or
down arrow key. The
u u u u
key increases the contrast
percentage, darkens the display and makes it visible
from a higher angle (when viewing from the bottom
of the instrument). The
d d d d
key decreases the con-
trast percentage, lightens the display and makes it
more visible from a lower angle.
External Power AC Pwr
Battery
AC Pwr
- Indicates that the external power source is
not a battery. If the external voltage is less than the
internal battery voltage, then the internal batteries
will supply power for the instrument.
Battery -
Indicates that the external power source is a
battery (which should not be allowed to deep-dis-
charge).
Min Battery 10.8 volts
Sets the external cutoff voltage when a battery is
used for external power.