I just got a new (to me) HP 5370B and I wanted to try it out on the 1 PPS
output
from a Trimble Resolution T. Using 10K samples averaging it is always
about
6 or 7 nS to high. Shouldn't this average toward zero? If I use no
averaging
it bounces around within the expected range.
I have done this test using the internal oscillator and an external rubidium
frequency
standard. I get the about the same results in both cases.
I did calibrate the OCXO in the 5370B using the rubidium standard and got it
so
that there is less than one cycle difference between the two over a period
of a few
hours.
I have tried a number of GPS units with the same result.
Could my rubidium oscillator be that far out? It is a FEI model FE5680A.
Am I missing something?
Pete.
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