OPHIR vega User Manual page 30

Nevertheless, since it does shorten the time between
charges, it is recommended to operate the instrument
without the backlight when the instrument is operated
without the charger.
3.6.1.2. Keypad Backlight
A set of LED's is arranged on the Vega's keypad panel in
order to illuminate them when necessary. Additionally,
the Vega can be configured to toggle the keypad lighting
on/off. It can also be configured to a power save mode in
which the LED's will self-extinguish 10 seconds after the
last key press.
Since it does shorten the time between charges, it is
recommended to operate the instrument without the
backlight when not necessary.
3.6.2. Charging
The Vega can be operated either by battery or from an AC
source with the charger plugged in all the time. Plug the
charger in the jack labeled "12VDC" on the back panel,
(Figure 3.2). The Vega's 12v input has dual polarity. The
batteries will be charged at the same rate whether the
Vega is switched on or off, and whatever the backlight
level or keypad illumination state. The Vega will fully
recharge in around 5 hours.
The approximate time between charges is given below for
various configurations:
Thermal, Photodiode sensors; keypad
backlight off, LCD backlight low:
Same; keypad backlight on, LCD backlight
high:
Pyro sensors; keypad backlight off, LCD
backlight low:
Same; keypad backlight on, LCD backlight
high:
29
16hrs.
11hrs.
11hrs.
8hrs.