[time-nuts] Allan deviation

[Bob Camp]

Hi

One real world application is or an autonomous box is supplied with many clock signals., The task is to select the one that's best. The standard of comparison may be far from "perfect" in this case. 

Bob


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. 
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