DOC 6501_Release V
ATS-6501 Users Guide
56
Unit has not enabled outputs (after power on).
GPS not tracking for more than 30 minutes
GPS receiver hardware error
Reference clock wander exceeded 100 ns from UTC
The outputs are not locked to the reference
Over temperature (internal temperature is greater than 65 C)
The internal rubidium clock is unlocked.
If set up for an External Reference:
• System is unable to communicate with the 5071A if set up to operate
with the reference_type=hp5071a
• 10MHz input from the external reference is not detected
If syscfg in enabled, use the status syscfg:errors command to get the current list
of configuration alarms.
Table 2 Alarm Indicator
3.1.3 Oscillator Locked (Osc Lock) Indicator
The Osc Locked indicator on the ATS-6501 indicates the current status of the internal or external
references. During system start up this light can take up to 5 minutes before it comes on.
Indicator Status
Off Internal Reference:
• The Internal rubidium reports that it is not functioning properly
• The OCXO cannot be steered.
External Reference:
• System is unable to communicate with the 5071A if set up to operate
with the reference_type=hp5071a
• 10MHz input from the external reference is missing
Green Internal: The rubidium reports that it is functioning properly and the OCXO is
being steered.
External: ATS-6501 is able to communicate with the external reference (if
5071A) and the 10MHz signal from the reference is available on the 10Mhz In
connector (reference_type=5071A or Cesium).
Red POST only.
Table 3 Oscillator Locked Indicator
3.1.4 GPS Tracking Indicator
The Tracking GPS light indicates whether the unit is collecting data from enough GPS satellites
to calculate a position and time solution. If the light is green then the GPS data is being used in
steering the frequency reference. If it is not lit and GPS was previously available then the
reference is being steered to the unit’s best estimate of UTC(USNO). This light should be green
during normal operations but may have occasional outages depending on the location of the GPS
antenna and quality of the installation. These outages do not significantly degrade the timing
performance of the system unless they occur for extended periods of time. If this light remains
off for more than 30 minutes then the ALARM light will illuminate to indicate a there are
tracking issues. This light will also turn off if the operator manually enters a position and makes
an error large enough such that the GPS receiver is unable to use the data.
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