On 09/01/2012 10:57 PM, J. Forster wrote:
Nope.
The rise/falls are far too fast for anything connected to the grid even if
in the same house. If the thing is on the output of a UPS with a rapidly
switched load, maybe.
Any big loads, even ohmic heaters, have some inductance. I don't see any
such influence.
Try an oscillator. I suggested an HP 200 series because they have big
output, comparable to the line. Furthermore, it's impossible for such a
unit to produce an output step, if it's working right. And they are very
cheap.
A simple phase shift oscillator with one transistor would work also. I's
not use anything digital, like a DDS.
I agree that you really need to check your measurement setup. The grid
doesn't do these things, possibly something in the house, but your
measurement rig is under suspicion.
Professional gear for measuring power lines has filtering, so anything
similar to this would be considerably smoothed out and not look like
this. While professional gear has it challenges, they are beyond these
issues.
So, do look careful at your setup. Loose connections, intermitent
connections in IC holders, stuff like that. Bad timing for the ADC.
Interrupt processing, ANYTHING.
Cheers,
Magnus
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