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64 997-01530-01, Rev. C-25, Jan 2008
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F72 – Fault Status
Use function F72 to display the fault status of the clock.
• Clock PLL – Locked or unlocked
• Clock Status – Locked or unlocked
Command Line
To display the status of the fault detectors, enter:
F72<CR>
F72 responds:
F72 CLOCK PLL LOCKED
CLOCK STATUS UNLOCKED
where:
F73 – Alarm Control / Status
Use function F73 to do the following:
• See the state of an indicator (“Locked/Unlocked” or “OK/Fault”)
• Enable or disable the alarm for each indicator
• See the state of the Alarm Latch for each indicator
• Clear the Alarm Latch for all indicators
• Enable or disable blinking of the Alarm Status LED on the front panel while it is green or amber
• Set the values for Time Threshold, Timeout Delay, and Power-On Alarm Suppress
The following table summarizes F73’s alarm indicators and parameters, as well as the factory settings
for an XL-GPS without options. The factory settings vary depending on the options included at the XL-
GPS at the time it ships from the factory.
CLOCK PLL = Clock Phase Loop Lock status, LOCKED or UNLOCKED
CLOCK STATUS = Clock Status, LOCKED or UNLOCKED to the reference source shown.
The LOCKED state is based on the F73 Time Threshold value entered
by the operator. F73 Time Threshold sets the threshold in nS above
which Time Error triggers an alarm. When the oscillator's predicted
worst-case time error (“F13 – Time Error” on page 48) exceeds F73
Time Threshold, Time Error enters a fault state and the CLOCK
STATUS becomes UNLOCKED.