Warning this is a tiny CT, measuring tiny currents. Don't fool around with those big things you see in a CT can!

I was playing with one of those small CTs on a lamp holder

[Linked Image from gfretwell.com]

My original intent was to get some ideas of what to look for if I was integrating this into a project. Short answer is there is plenty of current if you drive into about 1000 ohms and it scrubs off most of the noise.
You get around a tenth of a volt with a 14w load, .5v with 60w load and 1.2v with a 100w load (into 1k ohm). That doesn't seem very linear but I didn't plot it.

The interesting thing for me was the wave form.

14w seems pretty sinusoidal

[Linked Image from gfretwell.com]

As the wattage (and output voltage of the CT) increases it starts affecting the wave form.
100w is pretty warped

[Linked Image from gfretwell.com]

When you plug in a CFL things really start getting weird

[Linked Image from gfretwell.com]


Greg Fretwell