[time-nuts] Basic question re adev measurements

[Azelio Boriani]

A frequency offset is allowed but must stay the same for the entire
measurement.

On Mon, Mar 26, 2012 at 11:07 PM, Mark Spencer <mspencer12345 at yahoo.ca>wrote:

> Greetings,  I was reviewing some older adev plots of mine and noticed that
> there may be a correlation between lower adev numbers and lower frequency
> off set between the reference source and the device under test.   It's my
> understanding that the adev calculations remove constant frequency off sets
> but I'm wondering in practice this degrades the the measurements.
>
> It occurs to me that if I am comparing two 10 MHz signals with a TIC that
> the available dynamic range of each measurements will be 100 ns.   Would a
> constant frequency off set effectively reduce the precision of the
> measurements by eating up some of this dynamic range ?
>
> To put this in perspective frequency offsets of say one or two parts per
> trillion seem to result in better adev readings than off sets of say ten or
> more parts per trillion.
>
> Sorry if I have missed something obvious here.
>
> Thanks in advance
> Mark Spencer
>
> Sent from my iPod
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