Speaking of which, should have or stumble a gpib for said 5328a, I'm looking for one to go in my counter.
Thanks, Bob On 7/24/10, Mark Spencer <[email protected]> wrote: > 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 <[email protected]> > To: Discussion of precise time and frequency measurement > <[email protected]> > 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: [email protected] [mailto:[email protected]] On > Behalf Of Mark Spencer > Sent: Saturday, July 24, 2010 12:29 PM > To: [email protected] > 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 -- [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. > > > > > _______________________________________________ > 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.
