______________________________________________ Section 3: Operation
8197 Instruction Manual
Page 3-21
1
15V
230V
FIGURE 3-15 AC POWER MODULE
3.2.11 Cooling
Fan
Cooling fan operation is microprocessor controlled. The fan is turned on or off
based upon internal temperature range settings.
3.2.12 Chassis
Ground
The chassis ground lug allows the Model 8197 chassis to be connected to an
earth ground in addition to the power line safety ground. Connecting the chassis
to a single point ground system may be required in some installations to ensure
optimum lightning protection. A separate earth ground is also recommended in
installations where excessive noise on the power line degrades the Model 8197
receiver performance.
3.2.13
Battery Disconnect Switch
This switch is included on units equipped with Option 02, Internal Battery
Backup. Depressing this switch removes the backup battery power from the
GPS receiver and Rubidium oscillator. The Battery Disconnect switch is only
operational when AC power is removed. This feature prevents battery discharge
when shipping or storing the Model 8197.
NOTE: The internal battery
must
be disabled prior to
shipment or storage. Failing to disable the battery may
result in reduced capacity and shortened battery life.
