This is a question that has probably been addressed on the list and in
various texts but I've been unable to find an answer that I can fathom
so here's a request for some info about the behavior of TimeLab (and
probably all other similar programs).
I have been trying to find the source of some periodic noise that
appears when using a 5370B to measure an FTS 1050B against a 5065B. The
noise manifests itself varying from 12s to 20s in a repetitive fashion.
I asked C. Dawson about this and one of his suggestions was to try a
longer sampling period. Down the rabbit hole I went!
I ran four trials in succession at sample intervals of .07s, .25s, .5s,
and 1s. The result is as if the adev ,modified, and Hadamard curves
have been slid down and to the right along the noise floor of the 5370.
My assumption, apparently incorrect, was that the software would take
the sampling interval into account so that I would get essentially the
same plot. When I edit a plot changing the sample interval, the trace
remains essentially unchanged and this seems inconsistent with the
results noted above. Can anyone explain in relatively simple terms what
I'm missing?
Thanks,
Bob Darby
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