> More... OOPS > > You might try logging the output of an audio oscillator, Even an HP 200 > would work. > > -John > > ================= > > >> I agree: I don't think this is possible on a power line. Better to use a >> second sampling unit to check. >> >> On Sat, Sep 1, 2012 at 3:30 PM, J. Forster <j...@quikus.com> wrote: >> >>> 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. >>> >> _______________________________________________ >> 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. > >
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