Hi Does accuracy include temperature change over -55 to +85 C at a 1 C / minute rate?
Is accuracy measured after a 5 minute cold start at any temperature? Does accuracy include a contribution internal to the synthesizer (like DDS step size)? Is accuracy simply "where we set it when we shipped it"? There are *lots* of variations to this particular spec.... Bob On Apr 20, 2010, at 5:59 PM, [email protected] wrote: > Hi Magnus, Life speed, > > what does accuracy mean? Average (rms, 1-Sigma) frequency accuracy? If yes, > over what time frame is the average? > > Or is this the peak to peak allowable deviation? Over what temperature > range, and after how long of a warmup? > > To give you an example, a typical Fury desktop unit with DOCXO is capable > of better than 2us holdover drift per day after 3 to 5 days of constant > operation. > > That equates to an average frequency accuracy over one day without GPS of > <2.3 x 10^-11. > > With GPS the accuracy on average is better than 2E-012 after about an hour > or so averaging. > > bye, > Said > > > > > In a message dated 4/20/2010 13:07:53 Pacific Daylight Time, > [email protected] writes: > > life speed wrote: >> Time Nuts; >> >> I have a customer request for a microwave frequency synthesizer with > extreme accuracy requirements; >> 4 X 10^-11, or 0.04 PPB. Obviously this is way out of quartz oscillator > territory. >> Is GPS 1 pulse-per-second useable, or do they need an atomic clock? >> Maybe they don't realize what they are spec'ing. > > I really think you should ask them to motivate themselves on that spec, > the intended use etc. They can certainly get a spec like that, but is it > what they need? > > You certainly want something like a GPS clock to feed that thing if they > really need that level of accuracy. Or do they only need that level of > resolution? > > Cheers, > Magnus > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
