6.6 System Key Displays
35
6.6.3
EEPROM Errors
If the number of corrected (CORR.) errors begins to climb, contact the factory about replacing the
EEPROM.
EEPROM STATUS
CORR. ERRORS = 0
6.6.4
Fault Indications
There are a number of faults that may be indicated on the LCD. If a fault occurs and the FAULT
LED illuminates, the clock is unreliable and the Time Quality value on the IRIG-B message is set
to maximum (i.e. poorest quality). The first display (below) indicates no fault.
FAULT NONE
FAULT: ANT. OPEN
4.96 V,
0 mA
The second display indicates an antenna fault with antenna current at zero milliamperes. This
would indicate an open connection between the clock and the antenna. This fault goes away once
the connection is restored.
FAULT: TBP COM ERROR
dd/mm/yyyy hh:mm:ss
An error in communication exists between the TBP and the main processor. The fault disappears
if communication is reestablished. Second line is the time the fault occurred.
FAULT: VCXO FAIL
dd/mm/yyyy hh:mm:ss
The 8 MHz, Holdover Oscillator, signal is not getting to the main processor.
FAULT: HO / RECEIVER
GNSS RECEIVER FAIL
The Time Base Processor (TBP) is no longer receiving a 1 PPS signal from the GNSS receiver.
FAULT: HO / RECEIVER
RECEIVER SUSPECT
The Time Base Processor is receiving a 1 PPS signal from the receiver, but its rate is out of bounds
(a parametric failure).
FAULT: HO / RECEIVER
HO OSC. SUSPECT
The Holdover Oscillator frequency and/or drift parameters are out of bounds (parametric failure).
Summary of Contents for 1201B
Page 4: ...iv ...
Page 153: ...B 7 Four Fiber Optic Outputs 135 Figure B 4 Jumper Locations ...