[time-nuts] Allan deviation -> finally some data!!!

[Ulrich Bangert]

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: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] 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
> 
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