[time-nuts] time-nuts Digest, Vol 43, Issue 35
Didier Juges
didier at cox.net
Thu Feb 14 18:26:32 EST 2008
Martyn,
What is the type of oscillator used as the frequency reference of the SR620?
How is it characterized?
Didier KO4BB
> -----Original Message-----
> From: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com] On Behalf Of Martyn Smith
> Sent: Thursday, February 14, 2008 11:36 AM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] time-nuts Digest, Vol 43, Issue 35
>
> Pete,
>
> That's my point.
>
> Tom has plotted Allan Variance. I have plotted frequency accuracy.
>
> I get similar Allan Variance results to Tom. But if I just
> measure the accuracy, e.g peak to peak frequency variations,
> rubidium's out- perform OXCO's even when both are disciplined to GPS.
>
> I hope I'm not being stupid here.
>
> I measure frequency accuracy using my Stanford SR620 in time
> AB mode and calculate the frequency error. My accuracy floor
> noise is 2E-11/sec.
>
> When measuring an OXCO based unit I often get frequency
> errors of plus/minus
> 5 milli hertz. Rubidium units (mine and Symettricom) never
> has errors > 1 milli hertz.
>
> Best Regards
>
> Martyn
>
>
>
>
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