[time-nuts] Introduction

[Bruce Griffiths]

On Wednesday, February 24, 2016 12:55:42 AM Enrico Bellotti wrote:
> Hello to all,
> 
> first of all, thank you for the great and useful work that the time-nuts
> have done over the years.
> 
> I have finally been able to gather all my counters (HP5335A, HP51131A,
> HP5370A, HP5370B #1, HP5370B #2) and try to do some "simple" measurements.
> 
> I have started testing and comparing the instruments I have available using
> the approach that was discussed a while ago on the list and also outlined
> by John Ackermann (http://www.febo.com/pages/hp5370b/). Specifically, the
> Adev for a time interval measurement on a (90ft of) RG58A/U cable.
> 
> I have attached a PDF file with the results and some additional details of
> the test setup.
> 
> From what I have understood the Adev at one second is related to the
> counter resolution. The results I have obtained seem to be reasonable
> except for HP5370B #2. This instrument seems to be marginal at best. Does
> anybody know if the measured value for HP5370B #2 is a symptom of a
> multifunction or simple need for calibration?
> 
> Thank you for any comments/suggestions/corrections you may have.
> 
> Best.
> Enrico
 Try repeating the test with a low noise external reference/If that doesn't 
improve the results try realigning the filters etc in the 10-200MHz multiplier.

Bruce