[time-nuts] Allan Variance vs Allan Deviation

[William H. Fite]

Allan Deviation is the square root of Allan Variance.  I could generalize on
that but it might just muddy the water.

Just be sure that you correctly label the values that you cite.  You have no
control over the careless use of those terms by others.  It is, however,
pretty easy to look at the numbers, themselves, and tell which is which,
even if some boob names them incorrectly.





On Tue, Mar 29, 2011 at 10:01 AM, Martyn Smith <martyn at ptsyst.com> wrote:

> Hello,
>
> Sorry that I'm harping on about this subject but I want to make sure my
> brochures are correct.
>
> I use the SR620 to measure Allan Variance.  When I look at the SR620 manual
> the formulae they give for Allan Variance is actually root Allan Variance.
>
> So root Allan Variance is the same as Allan Deviation.
>
> So everyone (including me), when we quote Allan Variance, we really mean
> root Allan Variance or Allan Deviation.
>
> Does that make sense.?
>
> Steve
>
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