On Wed, 2009-02-04 at 02:59 +0100, Ralf Corsepius wrote: > Also: 1-2W of ca. 100W is 1-2% of the absolute value. > If the measurement device should be this > http://www.powermeterstore.com/p1206/watts_up_pro.php?p_tab=specs > which is specified to have an accuracy of > "+/- 3% (loads above 10 watts)", > then this measurement is below the accuracy of the device and not much > more but a "tendency". And just what do you think the nature of this inaccuracy is? Even if the meter is 3% off in absolute terms, unless the inaccuracy is somehow non-monotonic, it is still perfectly valid as a relative measure. Which is what is at question here. It doesn't matter what units you use, watts $$$ or trees, it's still saving something.
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