Randy, I use a 'lissajous' figure. I have a Tek 485 scope that permits 'X' input on channel 1 and 'Y' input on channel 2 and it is a 350 MHz scope. By choosing the 'X-Y' display, as long as the frequencies are close or have a common divisor, you can measure (with a stop watch) how long it takes the lissajous figure to make one complete cycle. From there, you can calculate the frequency difference between the two. If they are 'exactly' related, the lissajous figure will be 'frozen' on the screen.
Hope this helps. Joe -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Randy Sent: Saturday, November 08, 2008 12:17 PM To: 'Discussion of precise time and frequency measurement' Subject: [time-nuts] Checking accuracy of Rubidium standards I was wondering if it is worthwhile or even feasible to compare an LPRO Rubidium standard against a Z3801. Since their frequencies are probably going to be extremely close anyway it would seem some special method/equipment would be required for high precision. Suggestions? Randy, W7HR Port Orchard, WA _______________________________________________ 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.
