Spectracom 8194B, Инструкция по эксплуатации

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Spectracom Corporation 8194B, 8195B, 8197B
GPS Ageless Master Oscillator Instruction Manual 3-1
3 Operation
3.1 Introduction
This section describes the front and rear panel functions, and operational information for
the Spectracom GPS Ageless Master Oscillator.
3.2 Front Panel Functions
The front panel (with the battery option) is shown in Figure 3-1. The paragraphs below
describe the indicators and connectors found on the front panel.
3.2.1 Status Lamps
Power
This green lamp indicates that the unit is connected to the primary power source and is
turned on.
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.
Oscillator Locked
The green OSC LOCKED lamp is off during start-up. The lamp turns on when the
standard oscillator is phase locked to the GPS reference. Entering a new frequency
offset, an Alarm Timeout 2 (AT2) or Frequency alarm turns this lamp off until oscillator
phase lock is achieved.
3.2.2 Alarm Lamps
The Master Oscillator 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.
Major and Minor Alarm conditions are communicated by the front panel lamps and relay
contacts on the rear panel Alarm Output connector. In addition Major alarm relay
contacts are found on the 1544 kHz, 2048 kHz, Data Clock and Data Sync output
connectors. Alarm status may also be monitored using the front panel RS-232 or rear
panel RS-485 communication ports. Refer to Section 4 for a complete listing of alarm
status and alarm clearing commands.