Home made energy kWh meter.
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Uploaded by ChumpusRex on Jul 1, 2011
I've modified my power quality analyser and turned it into an energy meter. I've also fixed a rather fundamental problem with it, which was that it was distorting the waveform and creating lots of fake 'flicker'. LOL.
The device consists of two transformers:
A voltage transformer (I used a scrap toroidal PSU transformer) and
A current transformer
These connect via some wires and resistors to the "line-in" socket on my computer's sound card (Soundblaster X-Fi).
Home-made software then analyses the input to provide waveforms, current and voltage measurements, harmonic analysis, energy consumption, inrush analysis, flicker analysis, brown-out/black-out analysis, power factor measurement, etc.
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Uploader Comments (ChumpusRex)
All Comments (5)
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The big spike is the inrush. A bench grinder has a big inrush.
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The harmonics look much much nicer now, I feel safer plugging my computers into the wall now. :) You should consider making a kit, or pre-made solution, and sell it. I see your software, and designs outselling the kill-a-watt meter, due to the fact that you can use it as a DSO, over network and on a pc. Your work is amazing!
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By the way how do you filter out the noise on your soundcard, or is there none? What soundcard do you have?
narcoti 8 months ago
@narcoti There's not much noise on the soundcard. There is a bit on the 'current' channel, as the signal I'm measuring is so tiny. I've got a 100 A current transformer which I'm using to measure 0.25 A, and I've just shorted the CT out with a short piece of wire, which has very small resistance, so I get a very small voltage.
I use a creative X-fi card. I actually got better results with my integrated sound, but I think I broke the analog input with a bad connection, so I use the crappy x-fi.
ChumpusRex 8 months ago