[time-nuts] Allan Deviation recipe?
Gary E. Miller
gem at rellim.com
Tue Jul 19 02:01:58 UTC 2016
Yo Tom!
On Mon, 18 Jul 2016 18:42:39 -0700
"Tom Van Baak" <tvb at LeapSecond.com> wrote:
> Lots of ways to do it. There are GUI tools; command line tools, in C
> or Python or Matlab.
Got some C or Python?
> But to start with I highly recommend using John's TimeLab:
> http://www.ke5fx.com/timelab/readme.htm
I don't do Windows... And I want this to auto-generate graphs for web
pages on RasPi's. Lot's of RasPi's. :-)
> Here's a sample 1PPS phase (time interval error) data file (from a hp
> 53132A): http://leapsecond.com/pages/MG1613S/log167.txt
Yeah, that looks sorta like what I have.
> Or here's the same file in a more standard format:
> http://leapsecond.com/pages/MG1613S/log167.dat
Just the facts there, i can do that.
> http://leapsecond.com/pages/MG1613S/log167-adev.gif
That's what I think I am looking for.
A bit of background. Ntpd generates a number they call the Allan
Deviation, but the description looks like the Allan Variation, they
describe is as the minima in the Allan Deviation plot, when it has a U
shape.
They then use that number to set the PLL optimally.
Something looks fishy to me, so I want to visualize it, and help the
rest of the NTPsec team see it as well.
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
gem at rellim.com Tel:+1 541 382 8588
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