[time-nuts] 53230A TIC and TimeLab

Ole Petter Rønningen opronningen at gmail.com
Thu Oct 4 02:26:09 EDT 2018


You may want to have a look at http://www.efos3.com/53230A/HPAK53230A-1.html

Ole

> 4. okt. 2018 kl. 04:04 skrev AC0XU (Jim) <James.Schatzman at ac0xu.com>:
> 
> I have recently acquited a 53230A counter and have tried to measure ADEV of a GPSDO with it. I am suspicious of the ADEV numbers reported by TimeLab V1.31 because
> 
> 1) Timelab disagrees significantly with the ADEV numbers reported by the 53230A itself.  In this case, with 1 sec sample intervals, the 53230A reports an ADEV of about 370 micro Hz (or 3.7e-11). Time lab reports  1.5e-11 @0.01 sec sample period, 2e-11 @0.1 sec sample period, 6e-11 @1sec sample period - all at tau=1sec.
> 
> 2) When I use TimeLab to select different sample intervals, the whole ADEV curve shifts left (with smaller sample intervals) or right (with larger sample intervals).
> 
> Its as if TimeLab does not correctly account for the sample interval, but am I just not using the Timelab/counter setup correctly?
> 
> Thanks!
> 
> 
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