[time-nuts] ADEV secondary standard

Jeffrey Pawlan jpawlan at pawlan.com
Thu Nov 13 19:26:44 EST 2008


The only difficulty at all is simply the instrument calibration. One must have 
true knowledge about the noise bandwidth of the filter (usually a window) being 
measured.

I do know that HP, NIST, and I have used simple CW carriers instead of noise for 
the calibration. This is a good method for one offset frequency. In fact, it is 
slighty more dependable and accurate being a single tone. Its only disadvantage 
is that one needs to repeat this at every offset you want to calibrate so that 
is why the noise method was invented.


Jeffrey Pawlan





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