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ADE7758 | Gain Calibration (xWG, xVAG and xVARG)

Question asked by mths. on Jun 12, 2015
Latest reply on Jul 20, 2015 by mths.

Hi everybody,

 

I've got one question regarding the gain calibration of xWATTHR, xVAHR, xVARHR and would really appreciate if you could help me out.

 

First thing I have to mention is that I will not use the pulse outputs - I will directly read the values of the energy registers in my application using SPI. So if I'm getting anything right, the only cause to calibrate the gains of the energy registers would be to achieve constant Wh/LSB, VAh/LSB and VARh/LSB constants for the three phases, right? Am I missing accuracy if I don't perform any gain adjustment (leave xWG, xVAG and xVARG as default) but use specific constants for each phase (i.e. Wh/LSB(A), Wh/LSB(B), Wh/LSB(C)...) in my calculation instead?

 

I'm looking forward to your advice...

 

Best regards,

Mathias

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