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A divergence between AN-639 and ADE7880 EVB User Guide (UG-356) about Ifs formula description

Question asked by Sam.S on Dec 29, 2015
Latest reply on Jan 5, 2016 by dlath

Hi Sir,

 

Our customer has found a divergence between ADE7880 EVB user guide (UG-356) Page.4 and AN-639 Page.3 about the formula of CT burden resistance calculation description as below:


[UG-356 P.4]

UG-356_P4_CT burden resistance_formula.jpg

 


and [AN-639 P.3] :


AN-639_P3_CT burden resistance_formula.jpg

 

UG-356 description is R1 = R2 = Ra = Rb = 1/2 x 0.5 / root(2) x N / IFS = y/x, where y = 1/2 x 0.5 / root(2), x = 1/(IFS/N),


so, Ra = Rb = y/x

 

but AN-639 description is 2Rb = y/x;

 

 

Then, which one description is correct?

 

Thank you!

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