[time-nuts] HP 5345A

[Greg Burnett]

Boxes such as the 105A/B (and others) use the EFC as a fine manual frequency
adjustment.

For boxes without EFC manual adjustment, it's possible to set the 10811 to
3E-10 or better if you're careful and willing to go through a few iterations
over a few days. At time of performance check (of boxes containing the
10811) at Agilent Service Centers, the  "allowable offset" for 10811 equals
+/- 5E-8. If outside that "allowable offset" window, it must be optimized to
nominal within a limit equal to +/- 5E-9. This is a customer-driven
metrology policy (that was developed with the cooperation of several HP
divisions, including Santa Clara) and adopted world-wide by HP/Agilent
Services and Support Unit. Purpose of the policy is to define and
standardize when to re-adjust oscillators, and is not a Santa Clara
hard-spec.

    ...Cheers, Greg Burnett

--------------------

Rick Karlquist wrote:

I don't know of any instrument in the history of HP/Agilent that ever
used the EFC as a fine manual frequency adjustment.  The EFC
was only ever used as a phase locking interface.  The tuning adjustment
is adequate for annual calibration purposes (IE, you can set it
within 1 Hz, or 1E-7 if you are careful, and the expected annual
aging is in that ballpark).

Rick Karlquist N6RK




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