EndRun Meridian II, Руководство пользователя

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M e r i d i a n I I U s e r M a n u a l 142
C H A P T E R T W E L V E
143 M e r i d i a n I I U s e r M a n u a l
F R O N T - P A N E L K E Y P A D A N D D I S P L A Y
Receiver: Oscillator Status (Osc_Stat)
This display provides the system oscillator status information which includes oscillator type and
electronic frequency control status. The oscillator control DAC value indicates the frequency control
setting. The system automatically sets this value to remove frequency errors. Values may range from
0 to 1,048,575. Values close to the minimum or maximum will set the DAC fault flag that will appear
in the fault status display. The Time/Status display will also indicate a fault condition.
The oscillator type indicates the oscillator that is installed. Possible oscillator types are:
Temperature-compensated crystal oscillator (TCXO)
Medium-stability oven-controlled oscillator (MS-OCXO)
High-stability oven-controlled oscillator (HS-OCXO)
Ultra-stable oven-controlled oscillator (US-OCXO)
Rubidium oscillator (Rb)
Ultra-Stable rubidium oscillator (US-Rb)
Receiver: Calibrate
Calibrate is used to compensate for the propagation delay between the GPS antenna and the Meridian
II GPS receiver. This is required for the Meridian II to synchronize with maximum accuracy to UTC.
See Appendix E - Installing the GPS Antenna, Calibrate Your Receiver for more details.
Receiver: RTIC (Optional)
This optional display is used for control and status of the RTIC Option. See Chapter 11 - Real-Time
Ionospheric Corrections for more information.
Faults Menu
The Faults Menu is selected from the Main Menu and provides access to view the System Faults and
to set fault masks for the Antenna Fault and the Signal Loss Fault.
Faults: System
All system faults are shown on this display and their current status, either OK or FAULT. When a
fault condition exists the FLT indicator will flash.
These fault indicators are the same as the corresponding bit positions shown in the
gpsstat
fault sta-
tus word. (See Chapter 3 - Console Port Control and Status for information on
gpsstat
.) Unused
bit positions show on the display as ‘---’. The faults are listed below. For details on each fault, see
Appendix G - System Faults .
FLSH GPS Subsystem FLASH Writes
FPGA GPS Subsystem FPGA Configuration
SIG GPS Signal
DAC System Oscillator DAC
RCVC GPS Receiver Communication
REF GPS Reference Time
POLL Subsystem Communication
RCVF GPS Receiver