At a quick look, those look plausible line transients. However, the actual plots look badly undersampled during the transients. The plotted results in the transient areas are pretty meaningless, IMO.
YMMV, -John ============ > > Thanks for all the hints and suggestion. > > The problem seems to be anRS-232 receiver. I haven't seen any glitches > like > those since I moved the PPS line to a different PC. > > Has anybody seen anything like that before? > > Anybody got any ideas on how a receiver can turn into a driver? The > typical > level shifters have separate receivers and transmitters rather than a > tri-state and enable. Maybe I'll take it apart and see what chip it uses. > > There is a 1K resistor in series with the output of the wall wart so it > makes > some sense if a current/slew limited (aka weak) driver got turned on. > > Looks like I got a lemon in that box. (That's the box that has crazy > stuff > on the audio input like this: > http://www.megapathdsl.net/~hmurray/time-nuts/li > ne/2012-Aug-07-a0.png) > > Anyway, I'm back to looking at things that seem reasonable. Sometimes, > glitches happen when the line voltage changes. > > Here are a few graphs: > > Here is a sample voltage change: > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-02-b0.png > These are the beginning and end of the above: > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-02-b1.png > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-02-b2.png > > A pair of glitches that were close together: > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-02-c0.png > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-02-c1.png > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-02-c2.png > > Isolated glitches: > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-02-a0.png > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-03-a0.png > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-03-b0.png > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-03-c0.png > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-03-d0.png > > -- > These are my opinions. I hate spam. > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.