[time-nuts] Histogram of T2 arrival times

Easy, I have a 4 value array. It keeps count of the number of times each 0.1 msec step between -2000 .. 2000 msecs was seen. If two or more bins wind up with the same max count, I report the average of those bin times, otherwise it's the bin with the highest count. I also dump the

Re: [time-nuts] Histogram of T2 arrival times

hol...@hotmail.com said: > te a histogram of the values (along with the average and standard > deviation). I'm now using the peak histogram bin(s) to determine the > message offset time. The histogram technique has the advantage of ignoring > outlier points that can be caused by the system

[time-nuts] Histogram of T2 arrival times

I have added some code to my message time offset measurement routine to calculate a histogram of the values (along with the average and standard deviation). I'm now using the peak histogram bin(s) to determine the message offset time. The histogram technique has the advantage of ignoring

Re: [time-nuts] Histogram of T2 arrival times

Yup. I have some USB thermometers that are good for such things. Model? URL? Might be over-spec'ed or simply reflect a lack of broad evaluation on their part, but the SPEC folks have an accepted device list for temperature sensors to be used for measuring ambient temps for SPECpower(tm)

Re: [time-nuts] Histogram of T2 arrival times

Yo Hal! On Fri, 29 Jul 2016 02:50:59 -0700 Hal Murray wrote: > > So, you have plotted offset versus temp? Can we see that? > > I don't have offset vs temperature. This is what I work with: > http://users.megapathdsl.net/~hmurray/time-nuts/LAN-clock.png >

Re: [time-nuts] Histogram of T2 arrival times

> So, you have plotted offset versus temp? Can we see that? I don't have offset vs temperature. This is what I work with: http://users.megapathdsl.net/~hmurray/time-nuts/LAN-clock.png http://users.megapathdsl.net/~hmurray/time-nuts/LAN-temp.png Scan the wiki page for PID controllers:

Re: [time-nuts] Histogram of T2 arrival times

Yo Hal! On Thu, 28 Jul 2016 17:26:40 -0700 Hal Murray wrote: > g...@rellim.com said: > >> The systems collecting the data have 200-300 microsec peak-peak of > >> clock offset, mostly tracking daily temperature swings. > > How do you know that? > > Which "that"?

Re: [time-nuts] Histogram of T2 arrival times

g...@rellim.com said: >> The systems collecting the data have 200-300 microsec peak-peak of >> clock offset, mostly tracking daily temperature swings. > How do you know that? Which "that"? I don't have a formal proof, just a collection of data that all fits together. You can get the clock

Re: [time-nuts] Histogram of T2 arrival times

Yo Hal! On Thu, 28 Jul 2016 13:55:32 -0700 Hal Murray wrote: > http://users.megapathdsl.net/~hmurray/time-nuts/T2-hist.png Cool! > The systems collecting the data have 200-300 microsec peak-peak of > clock offset, mostly tracking daily temperature swings. How do you

[time-nuts] Histogram of T2 arrival times

http://users.megapathdsl.net/~hmurray/time-nuts/T2-hist.png 24K samples from KS-24361 200K samples from Z3801A The systems collecting the data have 200-300 microsec peak-peak of clock offset, mostly tracking daily temperature swings. A major fraction of the timing difference is explained by