Or modern counters where internally every type of measurement is reduced to a time interval measurement like the HP53132 (150pS resolution).
On Thu, Nov 24, 2011 at 8:04 PM, David Bobbett <d.bobb...@tiscali.co.uk>wrote: > Just as an aside, you /can /get rid of the 'dithering digit' problem if > you use a counter which employs a reciprocal counting technique. > > I use a Thandar Thirlby TF830 locked to a 10MHz reference derived from a > Tbolt, but I'm sure there must be others. > > > David Bobbett, G4IRQ > > > > > On 24/11/2011 18:01, Robin Kimberley wrote: > >> Any frequency counter will have an given accuracy +/- the LSD (least >> significant digit), so alternating between 10.0000000 and 9.9999999 looks >> perfectly normal to me. >> >> Rob Kimberley >> >> -----Original Message----- >> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On >> Behalf Of Frederick Bray >> Sent: 24 November 2011 17:56 >> To: time-nuts@febo.com >> Subject: [time-nuts] Differences / Jitter Between Frequency Standard >> Sources >> >> I have what would probably be considered to be a "newbie" question, so >> please excuse my likely ignorance. >> >> I have a HP 5385A frequency counter, which I am using with an external >> standard. If I try to compare one 10 MHz standard against another, using >> one as the external standard and the other as the device being measured, >> the >> readout fluctuates between 10.0000000 and 9.9999999. This happens when I >> am >> comparing a Z3801A and the Trimble look-a-like using the same GPS antenna >> and identical cables (including length) between the GPS antenna splitter >> and >> the two units. I have also used identical >> cables between the 10 MHz outputs and the counters. Hence, cable >> variations shouldn't be the issue. >> >> The same thing happens comparing the Timesource 2700 against either of the >> GPS standards. >> >> Is this attributable to the different standards or the frequency counter? >> I >> haven't yet set up a dual trace scope to compare the various sources >> directly, but that will be my next step. >> >> Thanks for any comments, etc. >> >> Fred Bray >> W6WAW >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.