I would agree. GPIB (aka HPIB) is ubiquitous and is a great place to start. Unfortunately, I haven't gotten that up to the top of my 'to-do' list yet. I have a computer, HP and National interface cards, cables, but no time to find the software to make everything communicate yet. I think it has a lot to do with the fact that I have relatively old HP equipment that is relatively 'tongue-tied' but I think I will be able to figure it out once I get the time.
Certainly the right place to start though, IMO. Joe -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. Forster Sent: Saturday, July 24, 2010 5:24 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Basic question regarding comparing two frequencies ".. more generic interface." ?? The vast majority of professional test equipment has GPIB. Virtually anything else is an "also ran". FWIW, -John ============ > Thanks, I'm glad to hear I am on the right track. At some point it would > be > nice to obtain a counter that can measure the drift of the time base in > the > 5328A. The 5328A has a GPIB interface but as the display only varies by a > few > counts I'm not inclined to track down a GPIB adapter just to plot this.) > Hopefully a newer counter would have a more generic interface. > > Best regards > Mark Spencer > > > ----- Original Message ---- > From: J. L. Trantham <jlt...@att.net> > To: Discussion of precise time and frequency measurement > <time-nuts@febo.com> > Sent: Sat, July 24, 2010 1:49:51 PM > Subject: Re: [time-nuts] Basic question regarding comparing two > frequencies > > Sounds about right. One cycle per 5 seconds or about 0.2 Hz difference. > Therefore, 9,999,999.8 Hz. > > I would feed the GPSDO to trigger your scope and look at the output of the > time base on one channel of the scope. You could also look at the GPSDO > on > the other channel. Then you could adjust your counter time base to > 'freeze' > the display. Probably good to 'align' the counter time base but for long > term comparison, probably better to use a counter and plot the difference. > > Joe > > -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On > Behalf Of Mark Spencer > Sent: Saturday, July 24, 2010 12:29 PM > To: time-nuts@febo.com > Subject: [time-nuts] Basic question regarding comparing two frequencies > > Hello: > > Just for grins I decided to compare the frquency from my GPSDO to the time > base > in my 5328A counter. > > > I connected the 10 mhz time base from the counter to channel A of my 100 > Mhz > > scope, fed the 10 mhz signal from my GPSDO into Channel B and with a T > adaptor > also fed this signal into the input of the counter. I scope to trigger > from > Channel B. > > > The drift betwen the two signals on the scope seems to match the error in > the > displayed frquency on the counter. (ie. if the counter shows 9999.9998 it > takes > approx 5 seconds for the the wave form on channel A to slip a full cycle > realitve to channel B.) > > > Is this a reasonable approach or is there a better way to compare two > frequencies using a scope ? > > Best regards > Mark Spencer > > > > _______________________________________________ > 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. _______________________________________________ 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.