I tested mine the same way. Turned out the 'bumps' were real but the 'jitter' was my scopes vertical being 'noisy' and resolved by 'diddling' with the input amplitude knob. The sine wave had about 1 V P-P into the 50 ohm input of the TEK 485.
Joe -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph Gray Sent: Tuesday, January 10, 2012 10:20 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FE-5680A arrived The first power supply I used couldn't provide enough current for the startup of the heater, so I had to dig out another. After fixing that issue, the first rubidium unit locked very quickly. For initial testing, I'm using a scope, triggered on my HP Z3801A. After several minutes of warm up (I didn't time it), I detect no drift in the rubidium's 10 MHz at all. I do see a bit of jitter and some "bumps" on the peaks of the sine wave. I'll cook this one for a while and then try unit number two. Joe Gray W5JG _______________________________________________ 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.
