Unruh wrote: > "David J Taylor" [] >> I put the temperature graph next to the timekeeping graph here: > >> http://www.satsignal.eu/mrtg/performance_feenix.php > >> 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 > is > 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 have. > 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 > rate > 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 > proxy > for the timing crystal temp. esp since the disk is probably not the > main > heat source. The CPU temp would rpobably be a better proxy, but > obviously > 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 > the > 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. Cheers, David _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
