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Содержание 5071A

Страница 1: ...digerenr operating parameters Thispaper will present an explanation of the parametersand show any correlation of them with the time frequency and environmental changes This paper will also ofet some indicators to predict future device problems INTRODUCTION The Hewlett Packard HP model 5071A Primary Frequency Standard is a quantum leap forward compared to the HP model 5061B Among the improvements i...

Страница 2: ...rol percentage rf amplitude 1 percentage rf amplitude 2 percentage Zeeman frequency C field current electron multiplier voltage signal gain percentage tube oven voltage tube oven t e m p e r a t u r e error oscillator oven voltage ion pump current hot w i r e ionizer voltage mass spectrometer voltage SAW tuning voltage DRO tuning voltage 87 MHz PLL voltage UPclock PLL voltage 12 volt supply voltag...

Страница 3: ...to monitor The value can be positive or negative and like most of the other parameters the value is very characteristicof the device One standard may have an oscillator control value of 8 6 and another standard may have a value of 43 1 Neither of these values done means that the clock is performing or will perform poorly A variation in the value may suggest a future failure and that will be covere...

Страница 4: ... reaches its limit the signal gain will increase to keep the overall gain constant The cesium beam oven voltage depends on ambient temperature The USNO standards values are consistent between 7 5 and 8 0 volts Actual values differ between devices The cesium beam tube error must be small I 0 1 volts for the standard to be operating properly The oscillator oven voltage typically has a value of 8 7 t...

Страница 5: ... a minor problem that can be seen in the parameters is a significant changei n the standard senvironmentalt e m p e r a t u r e A change in the environmental temperature can show up as an unusually large change in the electron multiplier voltage see Figures 1 2 and 3 More serious problems are seen when an electronic card inside the standard fails USNO has had some problems with the A2 and A6 cards...

Страница 6: ...see end of life CBT failures This is probably the only failure that every organization will see if they keep the standard for a long time or receive a n old standard The Hewlett Packard manual says that the standard CBT should last about 5 years The high performance is warranted for 3 years USNOs experience is that the high performance CBT lasts on average more than 5 years Two parameters that say...

Страница 7: ...they will show an average decreasejust before the CBT failure occurs A ward of caution though just because the rf amplitudes are showing these early signs does not mean that the CBT will fail in less then 30 days It should be taken as a warning that the device needs to be watched mare closely M o r e concern should be used when the tendency becomes more pronounced see Figure 14 after MJD 50706 Alt...

Страница 8: ...hould enable a person to predict the performance and life of a frequency Standard ACKNOWLEDGMENTS The authors would like to thank Randolph Clarke for clock performance analysis assistance and Edward Powers for providing historical clock parameter data A special thanks to Wendy King for the parameter information collection programming REFERENCE Hewlett Packad Company HP 5071A primary Frequency Stan...

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