We have been working with ADE7763 for energy metering project. At this point we have an accuracy of around 1.5% after doing watt gain and watt offset calibration. The same HW design is used as in ADE7763 datasheet, 0.01ohm shunt is used as a current sensor. Rated current is 5A and voltage is 220V. We have following questions to be answered :
1. What is optimal way of improving accuracy to meet 0.2%?
2. What would be the required number of half LINECYC for efficient offset calibration?