[time-nuts] Checking accuracy of Rubidium standards

[J. L. Trantham]

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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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 at febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.