>Any one of the counters listed above can do this measurement, A decent time nut Allan Deviation needs to have noise floor of below 1e-12. To do this for a 1sec ADEV, it needs a resolution of under 1ps, so NO not all the counters can do that.
ws ******************** On Mar 13, 2010, at 10:23 AM, Raj wrote: >> From KO4BB page > http://www.ko4bb.com/Timing/FAQ-1.php > > 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. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
