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current measurement for motor control


I was going through the sample c code provided for motor control (Isoinv_VF).

In the scalarControl.c file, gain factors Current_sincOffGainFactor and Current_sincGainFactor have been used. Current_sincGainFactor formula is given in AD7403 application note. But Current_sincOffGainFactor  formula is not there.

Can anyone tell from where it has been derived?

How can i validate if the current as measured by AD7403 is correct or not?