Charles.
On 04/10/2015 09:27 PM, Charles Steinmetz wrote:
The subject of errors in averaging counters at input frequencies near
the clock frequency and its subharmonics and harmonics comes up on the
list from time to time. There is a nice discussion of the phenomenon,
and how it was addressed in the design of the HP 5345A counter, in the
June, 1974 issue of the Hewlett-Packard Journal:
David C. Chu, "Time Interval Averaging: Theory, Problems, and
Solutions," HP Journal v25 n10, June 1974
<www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1974-06.pdf>
Good point. This technique is also used in the HP5328A, but only for TI
averaging, not for frequency measurement.
Cheers,
Magnus
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