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.