[time-nuts] Higher measurement rate to improve TIC quality?

[Dr Bruce Griffiths]

Brooke Clarke wrote:
> Hi:
>
> I'm still trying to understand Allan plots.  For example looking at a Time 
> Interval Counter's stability.
>
> The one shot resolution of the Time Interval Counter is important since it 
> determines the stability floor on an Allan plot.  Can the stability floor be 
> improved by making the measurements faster?  That would move the one shot 
> resolution point to the left thus moving the line down.
>
> For example if the one shot resolution of a TIC was 10 ns when measuring a 1 
> PPS signal that defines a point at 1 second on the X-axis and at 10 ns on the 
> Y-axis.  Now if the measurement can be made 10 times in each second (the test 
> signal is changed to a 10 Hz square wave), then the point on the Allan curve is 
> now a facter of 10 lower.
>
> Have Fun,
>
> Brooke Clarke
>   
Brooke

No, the resolution of the measurement for 1 cycle of a 10Hz square wave 
is degraded to 1E-7 cf with 1E-8 for 1 cycle of a 1Hz square wave.

Bruce