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ADE7953 AWATT and BWATT full scale expected reading

Question asked by alperuslu on Mar 9, 2017
Latest reply on Mar 16, 2017 by dlath

Hi,

 

In the Active Power Calculation section of ADE7953 datasheet, it is written that "With full-scale inputs, the expected reading in the AWATT and BWATT registers is approximately 4862401 LSBs (decimal)".

 

With full scale inputs 500mV , 1 LSB is equal to 0.5/6500000 = 7.692e-8. 

 

For power calculations, RMS value is taken that is 0.5/sqrt(2)= 0.3535.

 

Multiplying current and voltage channels will be 0.3535*0.3535=0.124V. Then the expected reading with full scale inputs should be 0.124/7.692e-8 = 1624509. What is wrong with my calculation?

 

Thanks & Kind Regards,

Alper

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