Energy metering project in progress.
Overview
Single meter detail
Construction of the power factor meter was interesting. I drew the voltage vectors, the inductor (beziers) and capacitor. The current vectors are done using the ‘meter’ display and hiding most of its (rather ugly) features. Set the Value property to an Expression Tag to calculate the angle. In my case it was:
acos({Nifty PF vector instrument.PF1})etc. Note that this returns radians so I just set the limits and colour changes in radians as shown below. (Convert to degrees if you wish.)
The one very useful enabling feature was the ability to rotate the whole meter. I have them on top of each other at 0°, 120° and 240°.
