[time-nuts] Allan deviation plots etc

[EWKehren at aol.com]

With u processors and flash memory it would be easy to build a counter that 
 over time counts the frequency, it would be totally autonomous, the 
reference  has to be connected all the time. Connection to a PC would be done when 
 necessary or a memory stick would be inserted, data transferred and then  
inserted in a PC. Bert Cost less than $ 100.  Bert
 
 
In a message dated 8/4/2009 9:38:36 A.M. Eastern Daylight Time,  
wpxs472 at gmail.com writes:

Ulrich  Bangert wrote:
my point has not been to judge who has to be interested in  what. My point
has only been to use the right terms for it. Let me give an  example: John
uses the term

> ...but I am more concerned with ...  and stability over time

Well, stability over time is what exacly is  displayed in a 
tau-sigma-diagram
of an oscillator. Since only a few words  before he is saying that he is NOT
intersted into Allan Deviation plots,  then he is perhaps interested into
something else?

Allan deviation  plots are interesting and if I had the means to generate
them, I certainly  would. Since I don't, I find it easier to interest myself
in ways to try to  measure oscillator performance in  practical terms with
the equipment  at hand. What I would really like is to be able to produce a
specification  in the same form as the oscillator manufacturers. I am used 
to
data in that  form and while the Allan deviation gives somewhat the same
data, I rarely  see one that gives a clue to stability over a year or 10
years. Most of the  ones I see seem more concerned with seconds to hours and
maybe weeks at  most. Of course, my method won't give any clue as to how an
oscillator will  perform over years either.
I hope this clears things up a  bit.
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