IMO, you have an instrumentation issue. I don't think the power grid can do anything like that.
YMMV, -John =============== > The context is using the 60 Hz line for timing. > > I'm feeding 60 Hz from a wall wart transformer into a modem control signal > that the kernel PPS stuff watches. Mostly, it works as expected, but > occasionally, it picks or drops a cycle. > > In order to understand what was going on, I fed the same signal into the > audio input and setup a job to capture the audio. Here is an example of a > pick: > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a-pick.png > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a0.png > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a1.png > > OK, that somewhat makes sense. > > > Something happened several days ago. I used to get picks/drops rarely, > say > ballpark of 1 a month. Now I'm getting 10 or 20 per day. So I started > looking closer. > > I'm now seeing stuff like this. I've got lots and lots of examples. I > added > a second PC with different hardware. It sees the same stuff. > > Does anybody recognize this? > > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-01-a0.png > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-01-b0.png > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-01-c0.png > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-01-d0.png > http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Sep-01-e0.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.
