Didier, i am currently not aware exactly HOW this data was acquainted, but in Counter_Ti.Dat you surely measured the noise floor of your HP5370. The Allan deviation of 3.5 E-11 @ 1s matches exactly the 5370's specified 30-40 ps rms measurement jitter.
While this measurement does not say anaything about any oscillator involved you should make a print of it and glue it to your wall since it will show you the noise floor of your equipment. You will never been able to measure a Allan deviation lower than this line for any Tau as long as the 5370 is involved. That should give you a good indication for the fact that your equipment will not enable you to measure the Allan deviation of GOOD oscillators at low Taus. 73 de Ulrich, DF6JB > -----Ursprüngliche Nachricht----- > Von: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Im Auftrag von Didier Juges > Gesendet: Donnerstag, 26. Oktober 2006 01:12 > An: Discussion of precise time and frequency measurement > Betreff: Re: [time-nuts] Allan deviation -> finally some data!!! > > > Ulrich Bangert wrote: > > Hi Didier, > > > > the sigma-tau plot looks indeed strange! Can you send me > the data file > > for some tests with it? > > > > 73 de Ulrich, DF6JB > > > The files are at > http://www.ko4bb.com/Test_Equipment/ > filenames: Counter_TIxx.dat > > Didier > > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-> bin/mailman/listinfo/time-nuts > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts