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>
Best regards,
Charles
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