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How to use KM34 to meet class 0.2% active energy accuracy?

Question asked by Guanmian Xu on Jun 1, 2020
Latest reply on Jun 10, 2020 by Sebastián Del Río

We are using KM34Z256 MCU in the product to measure the energy. 24-bit sigma-delta ADC is used for 3-phase current sampling and 16-bit SAR is used for 3-phase voltage sampling. Now the product meet class 0.2% current /0.2% voltage /0.5% active energy accuracy with default FW function blocks and basic calibration.

Is it possible to meet 0.2% active energy in this setup? What are the critical issues should be considered?