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HP 5071A Maintenance Manual
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29th Annual Precise Time and Time Interual (PTTI) MeetingMAINTENANCE OFHP 5071A PRIMARYFREQUENCYSTANDARDSUSNOATH.Chadsey (hc @planck.usno.navy.milA. Kubik (tony@simon.usno.navy.rni1)Time Service DepartmentU.S.Naval ObservatoryWashington, D.C. 20392AbstractThe US.Naval Observatory (VSNO) has been operating Hewleti-Packard model 507lAcesium-beamfraquenq standardr for over five years. During that period, there have beena variety offailures and these devices have shown frequency and phase changes.The HP 5071A model primary frequency standard oflers a very useful troubleshooting toolby outputting the status of 22 digerenr operating parameters. This paper will present anexplanation of the parameters and show any correlation of them with the time, frequency,and environmental changes. This paper will also ofet some indicators to predict futuredevice problems.INTRODUCTIONThe Hewlett-Packard (HP)model 5071A Primary Frequency Standard is a quantumleap forward compared to the HP model 5061B. Among the improvements is thegreater frequency stability through a broader temperature and humidity range. HPalso improved the device's operational parameter monitoring capabilities. Nolonger must people enter the room housing the device (disrupting its environment)and physically make the measurements on the device. The new standards canoutput their parameters via an RS-232 connection to a computer for permanentfiling and analysis.49 |
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