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ADE7880 Calibration formula clarification

Question asked by ArrowJarret on May 1, 2017
Latest reply on May 3, 2017 by nchandra

Referring to the AFVARHR and phase calibration, please clarify if we should still be using AWATTHR as opposed to AFWATTHR in the following equation. It seems odd to me that one variable (AWATTHR) would use total energy and the other variable (AFVARHR) would use fundamental only. Shouldn't they either be both total or both fundamental? 

This equation is from the phase calibration section of the AN-1171 application note.

 

Error(degrees)=tan^-1((AWATTHR*sin(theta) - AVARHR*cos(theta)/(AVARHR*sin(theta) + AWATTHR*cos(theta))

 

Thanks,

Jarret

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