kill a watt?

Jim Meyer purp at
Thu Mar 13 11:23:58 PST 2003

On Thu, 2003-03-13 at 10:22, Jim Lux wrote:
> Another inexpensive approach is to transformer couple the current and 
> voltage on the line into the L&R ports on a sound card, grab a tenth of a 
> second of data, and do all the power quality calculations you want.  If 
> you've got three phase power, you need 6 or 8 channels, which makes it a 
> bit trickier.. but you'll be able to see if you've got circulating harmonic 
> currents, etc.  Anyone ever synchronized multiple sound cards across a cluster?
> The current transformers are $20, the voltage transformer is $10 (brand 
> new, Qty 1 prices.. surplus can do MUCH better)

I love this list. =]

Jim Meyer, Geek at Large                                    purp at

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