[time-nuts] Allan variance by sine-wave fitting

Bob kb8tq kb8tq at n1k.org
Thu Nov 23 08:13:56 EST 2017


One other side to this: 

There are a number of papers out there on this basic technique (ADC frequency
measurement). There are a number of commercial products that do ADEV
and other measurements this way. It might be a good idea to at least mention 
them. It would be even better to look at the sort of accuracy they achieve. 


> On Nov 22, 2017, at 6:38 PM, Ralph Devoe <rgdevoe at gmail.com> wrote:
> Hi Time-nuts and Attila,
>         Thanks for the very interesting and informative criticisms. That
> is what I was looking for.  I don't agree with most of them, but I need
> some time to work out some detailed answers.
>          To focus on the forest instead of the trees:  The method uses a
> $300 student scope (Digilent Analog discovery- a very fine product), which
> any skilled amateur can modify in a weekend, and produce a device which is
> 10-100 times better than the expensive counters we are used to using.  The
> software contains only 125 lines of Python and  pretty much anyone can
> write their own. In practice this device is much easier to use than my
> 53132a.
> Ralph
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