14 Feb
2008
14 Feb
'08
20:28
Carlos E. R. wrote:
The problem in this case is that the load is neither: it is "switched". To calculate the real power used you need to sample the waveform, at least 15 samples per period, both voltage and current, then multiply and integrate (root mean square, RMS). You need some type of cpu. Actually, there is a chip that does all this, and I guess it is why these measurement gadgets have appeared in the market.
RMS measurements are not exactly new, Carlos. What's new is that they can now be done with cheap consume-style equipment. /Per Jessen, Zürich -- http://www.spamchek.com/ - your spam is our business. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org