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V and I rms offset calibration

Question asked by ooben on Oct 11, 2013
Latest reply on Oct 16, 2013 by hmani

Please help me understand the two formulas.

 

    sqrt(3767^2 + 128)

(   ------------------------     -1 ) * 100

               3767

 

which is on page 41, ADE7880 manual. How is it concluded?

By equation (15) on that page, then I can calculate xIRMSOS value as

 

                            Irms^2 - Irms0^2

xIRMSOS  =  ------------------------------

                                      128

 

Where:

xIRMSOS: AIRMSOS or BIRMSOS or CIRMSOS register offset value.

Irms : current input from accurate source

Irms0: xIRMS register reading without calibration.

How equation 15 is concluded?

are what I understand correct?

Thanks!

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