Sokkia GSR2700 IS, Operation Manuals, Page: 54 / 87

GSR2700 IS Operations Manual 43
Basic Operations Chapter 5
For information about charging the internal batteries, see Section
5.6,
Charging the Internal Batteries , page 46.
5.2.2 External power source
In addition to using the internal batteries, the GSR2700 IS can be
powered using an external battery according to the
recommendations in this section.
NOTE If you want to charge your receiver while driving a vehicle, use a
DC to AC inverter that meets the input specifications as detailed
in Appendix A,
Technical Specifications , page 55.
For the receiver to operate with an external power source, the
minimum operating voltage for the external power input cannot
be less than the minimum GSR2700 IS operating voltage. See
Appendix A,
Technical Specifications , page 55 for detailed
information about the GSR2700 IS operating voltage.
When an external power source is present, the GSR2700 IS uses it
before drawing on the internal batteries, provided that the power
from the external source is greater than that of the internal
batteries.
If the voltage delivered from the external power source is less
than the internal battery power, the internal batteries will be used
until they are drawn to the same level as the external source.
Once the internal and external batteries are discharged to the
same level, the receiver will draw equally from both sources.
When the receiver is on and connected to an external power
source that provides 14–18 VDC (including the AC Adapter), the
internal batteries will be charged while the receiver is operating.
CAUTION
If the external power input exceeds 18 VDC,
it may damage the receiver.