[time-nuts] Data Collection for Allan Deviation
phk at phk.freebsd.dk
Sun Aug 2 02:13:57 EDT 2015
In message <1502052008.304624.1438465781711.JavaMail.yahoo at mail.yahoo.com>, Bob Stewart writes:
>Here's an example of what I'm talking about. See description and
>notes. The blue trace is the one using the clock in the 5370A.
>The other tests match pretty closely down to around 60s or so.
As a general principle: Until you know why they differ, always trust the worst measurement
rather than the best measurement.
The "waves" on the blue line could indicate a spur which is not at
a multiple of your basic sampling frequency (1Hz)
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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