EndRun Sonoma N12, Руководство пользователя

Страница: 161 / 174

S o n o m a U s e r M a n u a l 144
A P P E N D I X G
145 S o n o m a U s e r M a n u a l
S Y S T E M F A U L T S
Receiver Fault Definitions
The following faults pertain to the EndRun GPS Receiver (see Chapter 1 - Introduction, GPS Re-
ceivers
). Sonoma began shipping with these receivers in June 2017.
When a fault on the EndRun GPS Receiver occurs, the system fault indicator RCVF will show fault
and the Alarm LED will light. You can see which fault is the problem by using the
faultstat
com-
mand. Below are details about each fault indicator.
GPS Receiver Oscillator DAC (DAC)
This fault indicates that the DAC for the oscillator has reached either the high or low alarm limit
while locked to the GPS signal. Unless the unit is being subjected to out-of-specification environ-
mental conditions, this would indicate that the oscillator frequency has drifted near to the end of life
region. This should normally only occur after at least ten years of operation. The unit will continue
to function until the oscillator frequency finally reaches the DAC endpoint. The unit should be re-
turned to the factory for oscillator replacement at your convenience.
GPS Signal (SIG)
This fault indicates that the GPS Receiver has not been able to acquire a GPS signal for one hour
while the Time Figure of Merit has been 9, the unsynchronized condition. This could be due to a
variety of reasons. If there are no other faults that could explain the inability to receive a signal, then
there could be an antenna failure or blockage. If the condition persists indefinitely, and a problem
with the antenna is not evident, then please contact EndRun Customer Support.
GPS Receiver FPGA Configuration (FPGA)
This fault indicates that the GPS Receiver is unable to configure the FPGA. This is a fatal fault.
Please contact EndRun Customer Support.
GPS Receiver FLASH Writes (FLSH)
This fault indicates that the GPS Receiver is unable to verify a write to the FLASH non-volatile
parameter storage area. This should not ever occur under normal operation.. Please contact EndRun
Customer Support.
Synthesizer Limits (SYN1)
This fault indicates that the local oscillator synthesizer has reached the alarm limit. This condition
should not normally occur unless the unit is subjected to out-of-specification environmental condi-
tions. Otherwise, this is a fatal fault. Please contact EndRun Customer Support.
Synthesizer (SYN2)
This fault indicates that the local oscillator synthesizer has failed. This condition should not nor-
mally occur unless the unit is subjected to out-of-specification environmental conditions. Otherwise,
this is a fatal fault. Please contact EndRun Customer Support.
GPS Reference Time (REF)
This fault indicates that the GPS Receiver received an erroneous time input from the GPS signals. If
the condition persists please contact EndRun Customer Support.
GPS Receiver Oscillator (OSC)
This fault indicates that the main oscillator has failed. This is a fatal fault. Please contact EndRun
Customer Support.