[ntp:questions] refclock on Windows graphs
David J Taylor
david-taylor at blueyonder.neither-this-bit.nor-this.co.uk
Fri Mar 20 15:53:30 UTC 2009
> "David J Taylor"
>> I put the temperature graph next to the timekeeping graph here:
>> but I think that ambient temperature would be much more useful than
>> HDD temperature.
> Unfortunately the scale on the graph is a bit useless (the variation
> squeezed up far too much).
Yes, and no. It's MRTG, so it's going to plot from 0, and if the
variation isn't as much as even 5 degrees then I think I need to look at a
different measurement. As a quick fix, we have to make do with what we
> Also It is not at all clear what the
> "Timekeeping" graph is a graph of. Is that the offset, the drift rate
> correction? And what is 5001's ? (the quoted offset) It is the drift
> that should correlate with temp.
Timekeeping is the offset. The original graph had "offset + 500us" where
the "u" was the micro symbol, but while that has displayed correctly in
most of the place, it has failed on the graph Y-axis label. I'll replace
"micro" with "u".
> It is certainly true that something like disk temp is a best a poor
> for the timing crystal temp. esp since the disk is probably not the
> heat source. The CPU temp would rpobably be a better proxy, but
> even that is not very good. "motherboard temp" might be better.
> Anyway, by plotting both the drift rate correction and the temp of
> these various
> locations you could get a better idea of which correlated best with
> timing crystal rates.
Thanks for your input, Bill. If I can get a more accurate temperature, I
will look into plotting the offset on MRTG as well, or using a better
plotting program. For me end use, though, it's the offset which matters.
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