I saw this same effect just last week. I was working with a dspic on a=20
breadboard and had the scope attached and was noticing an odd waveform=20
mixed in with what I expected from the dspic. I cut off the power to the=20
dspic and waveform still there, started unplugging things around the=20
bench looking for the culprit.  Found it, the new CFL bulb I had just=20
put into my work lamp, I was using incandescent bulbs in it but they get=20
really hot so I used a CFL. The interference occurred up to 10 feet=20
away. Back to incandescent bulbs till I can get some LED going.

Mark





On 12/15/2011 5:24 PM, Philip Pemberton wrote:
>
> The lamp in question was later found to be emitting a 30kHz peak, plus
> harmonics beyond several MHz, and was more than capable of overloading
> an RF field sensor at a distance of a foot.. Its effects were still
> measurable on the other side of the room.....
--=20
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