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ADE7880 xVGAIN

Question asked by Bastler on Mar 27, 2014
Latest reply on May 6, 2016 by dlath

Hello,

I have some problems with the registers during the calibration.

 

In the AN-1771, page 11, is described how to calculate the xVGAIN register, but I didn't understand the formulas.

 

If I solve the equation (1) to (3) and put it in (2) I get (4), which means my value is 1.

 

Where is my failure ?

 

ADE7880.png

For example  (1) I have an VoltageInput= 0,0076V, the ADE convert it to VRMS = 83200 -> Vconstant = 0,0911µV

 

Calculation of xVGAIN

(2) I take the values from (1) and my result is 2^23

 

Can you give me a definition or an example of the different values in the formula ?

 

Kind regards

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