8197 Instruction Manual
Page 3-1
OPERATION
3.0 INTRODUCTION
This section describes the front and rear panel functions, and operational
information for the Model 8197 GPS Ageless
Oscillator.
3.1
FRONT PANEL FUNCTIONS
The front panel of the Model 8197 is shown in Figure 3-1. The paragraphs below
describe the indicators and connectors found on the front panel.
3.1.1 Status
Lamps
3.1.1.1 Power
This green lamp indicates that the unit is connected to the primary power source
and is turned on.
3.1.1.2 Tracking
GPS
During initial operation, the TRACKING GPS lamp turns on when the receiver
has tracked at least four qualified satellites for one minute. The lamp turns off
when fewer than four qualified satellites are tracked and Alarm Timeout 1, AT1,
expires. The lamp turns back on when at least four satellites are reacquired and
qualified for one minute.
3.1.1.3 Oscillator
Locked
The green OSC LOCK lamp is off during start-up. The lamp turns on when the
standard oscillator is phase locked to the GPS reference. The lamp is turned off
if an Alarm Timeout 2 (AT2) or Frequency alarm occurs. The lamp remains off
until oscillator phase lock is reacquired.
3.1.2 Alarm
Lamps
The Model 8197 divides alarm conditions into two categories, Major and Minor.
A Major Alarm is asserted when fault conditions exist which affect the operation
or accuracy of the unit. A Minor Alarm warns of conditions having no immediate
effect on total operation, but may require corrective action.
