[time-nuts] 60 Hz line quirks, anybody recognize this stuff?

[Hal Murray]

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

-- 
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