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ATS-6501 Users Guide
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6. Troubleshooting
The following section provides some basic troubleshooting information to assist users in
case they suspect there is an issue with the system.
6.1 Front
Panel
Indications
You can use the front panel indicators to assess the status and operation of the unit.
Under normal operating conditions the user should see:
Green Status Indicator on both power supplies
The front panel clock should display the last two digits of the year, the correct Julian
Date (see appendix D.) and the correct time (UTC). The time should also increment
each second.
The Alarm Light is Off
The OSC Lock, GPS Tracking, NTP Locked, and Outputs Enabled lights are green.
6.2 Alarm
Light
The alarm light will turn red when the unit has detected a hardware failure or an event has
occurred that may cause the timing signals output by the unit to be outside of their specifications.
Either power supply missing/failed or without AC/DC input power.
Any output module reporting a failure or is not locked to the reference
GPS has not been not tracking for at least 6 hours or there is a hardware error
Reference clock wander has exceeded 100ns from UTC
The Rubidium is unlocked.
Over temperature (65 C)
External Reference
o
System is unable to communicate with the external reference source
o
10MHz input from the external reference is missing
If the alarm light is on users can determine the exact cause of the alarm by accessing the
command port and typing the
status alarm
command and obtain a list of the current alarms.
If the alarm light was on and is currently off, users can connect to the command port and
type the command
syslog error
to obtain the list of errors from the error log file maintained by the
system.
6.2.1 Power Supplies
The system has two power supplies and is capable of operating from either supply in the
event one of them fails. If one of the status indicators on the power supply front panel is red there
is a problem with that supply. The front panel alarm light should also be on. Power supply #1 is
on the left and Power Supply #2 is on the right. The possible problems are listed below:
Power Supply has failed
Internal Fuse is open
Power Supply is unplugged, make sure the power supply is plugged in