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What exactly would we be measuring unless we compare our standards to a perfect standard ?

Maybe be a jittery oscillator with a slow drifter on a walkabout. :-)

>The Allan Deviation is typically computed from a series of Time Interval (TI) measurements against a reference oscillator. Any one of the counters listed above can do this measurement, which simply is the measure of the delay between a signal on Input A (Start channel) and another signal on Input B (Stop channel). 

73 & a great weekend!

-- 
Raj, VU2ZAP
Bangalore, India.