Hi If the gate time is fairly long, the "notch" in the resolution is quite narrow. You don't have to be very far off of 10 MHz to go back to fairly high resolution. Again, not a knock on this fine counter, just something to watch out for.
Bob On Mar 17, 2013, at 7:45 AM, Magnus Danielson <[email protected]> wrote: > On 03/17/2013 01:43 AM, Bob Camp wrote: >> Hi >> >> The 53132 is indeed a fine counter. It's got another flaw though - right at >> 10 MHz the resolution takes a dive. If you are doing time nut stuff, that >> may be a significant issue. > > The frequency averaging method can make use of the beating of the reference > clock against the incomming clock, to get more information on the frequency > difference. If the clocks are near each other, it takes longer averaging to > get the same effective resolution. You can expect the same type of effect > around frequency ratios like 3/2 etc. > > This is expected as it is a systematic effect where most of the new samples > does not bring any new info as they pop in systematically in the places where > they don't give info. Adding noise (sloppy trigger) could actually improve > the precission, as it would combat the quantization effect. > > Cheers, > Magnus > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
