----- Original Message ----- From: "R L Measures" <r at somis.org> > > Good points, Tom. However, as I recall, the spec is 5% of F.S. plus > 5% of reading, so the accuracy would be +/- 125w plus +/- 75w = +/- > 200w for a 1500w measurement. Also, don't forget the feed thru from the driver needs to be deducted. / TT