[time-nuts] Updated Divider Jitter Results
Poul-Henning Kamp
phk at phk.freebsd.dk
Sat Apr 4 11:30:29 UTC 2009
In message <49D740D1.1030600 at febo.com>, John Ackermann N8UR writes:
>Sure. I didn't write down the numbers because it was an interim step,
>but I earlier did that and IIRC the std dev was around 20-25 ps.
>
>Would error in the cal circuit tend to falsely increase, or decrease,
>the result? Or both?
In my experience it generally skews your result downwards, but I have
seen it move upwards also, it all depends on the phase.
By running the 5370 from a unlocked source makes the input signals
"precess" over the input windows and averages stuff out.
I only lock my 5370 if I need to measure long timeintervals, for
short intervals the timebase error is lost in the noise.
--
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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