> > > See the part the end that shows why averaging breaks ADEV: > http://leapsecond.com/pages/adev-avg/ >
Hi Tom, thanks for reminding me of that page. I did no averaging of the data myself, and I think it's logical that the counter noise floor goes down with increasing gate time - I just haven't had time to read and think about the counter specs enough to write down some reasonable formula that predicts the noise floor for different gate times. PHK's comment about trying something different than exactly 10MHz is worth testing. Reading your page above I am confused by the graph where you add noise. If I create a synthetic phase dataset with 1 ns of RMS noise (i.e. you histogram the data and it looks like a gaussian with standard deviation 1ns) and then calculate ADEV I get ADEV(1s) = sqrt(3)*1e-9 (tried with both stable32 and allantools) Your page says "add 1ns noise" and shows ADEV(1s)=1e-9. Can you clarify what "add 1ns noise" means - or am I doing something wrong? Anders _______________________________________________ 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.
