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

Brooke Clarke brooke at pacific.net
Fri Apr 20 20:00:13 EDT 2007


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
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml

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