[time-nuts] Re: Repeatability of stability measurements

[Magnus Danielson]

Hi Hans-Georg,

Maybe it is better to refer to this as the inverse of 20,48 GHz, since 
that is the virtual clock rate of the interpolated coarse-clock. 
Considering that it is 2048 * 10 MHz, it is not hard to imagine that a 
coarse clock of say 80 MHz is then interpolated by 256 to achieve that, 
which is entierly reasonable. 160 MHz and 128 is another example. A look 
down the manual should indicate which one it is.

Cheers,
Magnus

On 2022-06-25 21:10, Hans-Georg Lehnard via time-nuts wrote:
> Sorry, this was completely nonsense .. i correct the resolution factor
> and forgot the "e" so  i get 4.8828124999999998-11 as factor and scaled
> the timelab plots with it. My interpretation is just as stupid.
>
> The correct Factor is 4.8828124999999998e-11.
>
> Am 2022-06-25 17:15, schrieb Hans-Georg Lehnard via time-nuts:
>
>> First of all the resolution factor from my first post is a copy error
>> the correct value is 4.8828124999999998-11 (less decimal places). In the
>> attached diagrams the correct factor was used.
>>
>> I generated testfiles with 2046,2047,2048,2049,2050 intervals, loaded
>> into timelab and scaled them with 4.88281249999998-11.
>>
>> MDEV shows more noise as real measurements . Another testfile with 2000
>> intervals and scaled with 5e-11 shows similar results.
>>
>> In the Frequenc difference plot you can see the difference grows
>> stepwise with time. The zoom shows where the 2048 intervals are already
>> in the next time step and the 2000 intervals are not yet. By zooming in
>> you can also see this between the 2046 and 2050 intervals.
>>
>> Possibly an overflow or rounding error ?
>>
>> I think the overlap of this effect with the white noise of the real
>> measurements creates my measured jumps.  More noise attenuates this
>> step-like progression.
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