Magnus. Thanks. Re-read your original post and along with your latest I now understand what's needed.
I will come back if I have other questions. Thanks! Jeff -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Magnus Danielson Sent: Sunday, September 22, 2013 1:02 PM To: [email protected] Subject: Re: [time-nuts] How To Measure Long Term Phase Stability Of An Oscillator Jeff, You need to measure phase with sufficient resolution and rate of time. I was vague on the equipment side but rater noted what you needed to do in the analysis-side. I would prefer to measure it at least with 10 measurements a second. Bob mentioned resolution, which is important as you don't want your measurement being swamped by measurement noise. I would use a TimePod, but not all of us have one, which is a pitty as it is a good instrument suitable for exactly this. Cheers, Magnus On 09/22/2013 02:01 PM, W3KL wrote: > Magnus. Thanks. If I understand, this reduces to a measurement of > frequency stability along a measurement of phase noise? > > Jeff > > -----Original Message----- > From: [email protected] [mailto:[email protected]] > On Behalf Of Magnus Danielson > Sent: Sunday, September 22, 2013 7:47 AM > To: [email protected] > Subject: Re: [time-nuts] How To Measure Long Term Phase Stability Of > An Oscillator > > On 09/22/2013 01:30 PM, W3KL wrote: >> How does one make a measurement of the phase stability of an >> oscillator over a time period much larger than the oscillator period? >> For example, I have an oscillator with a frequency of 4 MHz and I >> want to measure the phase drift of the RF between a given point in >> time and then a time 4 seconds later. I want to make a measurement >> that has a precision of 0.1 degree or better. > You want to measure a drift of 4/(4E6*3600) = 278 ps. You systematic > frequency error can be at maximum 1.39E-10 relative, For your noise > side look at TDEV at tau of 4 s, multiply that number by at least > three and it should when added with peak frequency error be below 278 ps. > > 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. _______________________________________________ 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.
