[time-nuts] Fixing an HP 5370A with a missing ROM board

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Jul 25 13:18:17 UTC 2009


Mark Sims wrote:
> If you are measuring frequency,  the accuracy of the results are totally dependent upon the accuracy of the reference frequency.  The 10811 can move 2.5e-10 with a 10% change in line voltage (which happens quite often around here as quite a few zillion watts of air conditioning cycle on and off over a day)
>
> -----------------------
> Due to the short measurement intervals of the 5370, it is actually
> pretty insensitive to the reference frequency quality. 
>
>
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Such a frequency shift corresponds to about 2.5ns error in a 10s time
interval (5370 maximum range).
This is much greater than the 25ps resolution and 100ps maximum
differential nonlinearity spec for the 5370.
For time intervals greater than 100ms or so such frequency changes will
significantly degrade the performance.

Bruce





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