Trimble R6/R7 GPS and Trimble R8 GNSS Receivers User Guide 33
General Operation 4
Trimble R7 GPS Receiver Operation
The Trimble R7 GPS receiver can be powered either by its two internal batteries or by
an external power source connected to Port 2 or Port 3. The charge provided by the
internal batteries depends on the type of survey and operating conditions. Typically,
one battery provides about 3.5 hours of power during an RTK survey using the internal
radio, and about 5 hours during a survey without the internal radio.
The external power source is always used in preference to the internal batteries. When
there is no external power source connected, or if the external power supply fails, the
internal batteries are used. The internal batteries are drained in turn, and the receiver
automatically switches to the full battery when the first battery is drained.
If no external power is supplied and both internal batteries are drained, none of the
data that you have logged is lost. When internal or external power is restored, the
receiver restarts in the same state as when power was lost. For example, if the receiver
was logging data, the data file is not corrupted, and when power is restored the
receiver resumes logging with the same settings as before.
The power supply that comes with the Trimble R7 GPS receiver charges the internal
batteries while they are still in the receiver. To do this, connect the power supply to the
power/serial data cable, connect the cable to Port 2 on the receiver and then connect
the power supply to an AC power source, as shown in Figure 4.2.
Figure 4.2 Charging the batteries
The two internal batteries take approximately eight hours to charge. They are charged
individually, so each battery takes approximately four hours to charge. The internal
batteries start charging whenever an external power supply of greater than 15 V is
detected.
2
3
Power/serial data cable
To AC
power supply
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