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5. Power Supply
5.1. Changing Batteries
The 8 "C" cells are housed in the battery compartment in the bottom of the CDU. Access is gained
by unscrewing the central retaining screw and pulling out the end cap and pcb assembly. The cells
can then be removed. When putting in new cells, be careful to ensure they are inserted the correct
way. Labels are located in the compartment to indicate the correct way [note the large springs
touch the -ve end on each cell, small springs the +ve end].
5.2. Battery Life
The current consumption of the units is as follows [all measured at 10vDC]:
Standby
Run
The battery life, based on good quality alkaline cells, operating at approximately 15 degC [note
performance can reduce with low temperatures] and working on a duty cycle of 5 minutes On / 1
minute Standby is as follows:
Backlight off
Duration to low battery
Duration to stop
Backlight on
Duration to low battery
Duration to stop
If the unit is left in standby, and if no button has been pressed for 5 minutes, the beeper emits 5
beeps to remind the user that the unit is still switched on. This feature does not operate when the
CDU is connected to a PC for communications such as downloading data.
Backlight On
92 mA
229 mA
Elapsed
Elapsed time
Time
Low Battery to
(Hours)
34.00
37.50
20.50
27.50
Backlight Off
33 mA
171 mA
Actual On
Time
Stop
(Hours)
(Hours)
28.33
3.50
31.25
17.08
7.00
22.92
Power Supply
Page 17
On Time LB
to Stop
% Duration to
Low Battery
(Hours)
2.91
91%
5.82
75%
© 2016 Valeport Ltd
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