[time-nuts] Data Collection for Allan Deviation
phk at phk.freebsd.dk
Sat Aug 1 17:10:27 EDT 2015
In message <1925117252.232793.1438455428192.JavaMail.yahoo at mail.yahoo.com>, Bob Stewart writes:
>"0) Make sure that the counter does not get its reference frequency
> from any of the input signals."
>Does your rule 0 hold if one of the input signals is a Cs standard?
>I believe I've posted in the past that the ADEV from 1 tau to 100
>tau is a bit noisy if I use the internal 10811 to clock the 5370A.
>I noticed the same on my 5335A.
For me it is a rule of principle: If the HP5370 is clocked from the
same source I'm measuring, I can have no expectation of a well
behaved noise from the triggers.
The "noise" you saw is probably exactly that: Overly optimistic
results if you clock the counter from one of the DUTs
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