I have read the two calibration app note as I have attached. I am using adxl375.
1. I have been able to do 6 point calibration correctly as in AN4399.
2. Now I want to do 12 point calibration as in DM00119044 or AN4399.
Page 8 of DM00119044 shows the matrix for calculation.
This matrix will yield to 18 equations right? As below. Now I have 18 equations & 12 variables.
Is there any software which can solve these for me:
3. Now for 15 point calibration as in AN4399. page 33. They had added a cubic nonlinearity.
What is its purpose?
Why to add cubic factor here?
1. I have been able to do 6 point calibration correctly as in AN4399.
2. Now I want to do 12 point calibration as in DM00119044 or AN4399.
Page 8 of DM00119044 shows the matrix for calculation.
This matrix will yield to 18 equations right? As below. Now I have 18 equations & 12 variables.
Is there any software which can solve these for me:
Code:
/* 18 equations */
/* +z axis */
a11*30 + a12*50 + a13*2548 + o1 = 0
a21*30 + a22*50 + a23*2548 + o2 = 0
a31*30 + a32*50 + a33*2548 + o3 = 1
/* -z axis */
a11*20 + a12*10 + a13*980+ o1 = 0
a21*20 + a22*10 + a23*980 + o2 = 0
a31*20 + a32*10 + a33*980 + o3 = -1
/* +y axis */
a11*30 + a12*1911 + a13*50 + o1 = 0
a21*30 + a22*1911 + a23*50 + o2 = 1
a31*30 + a32*1911 + a33*50 + o3 = 0
/* -y axis */
a11*20 + a12*49 + a13*10+ o1 = 0
a21*20 + a22*49 + a23*10 + o2 = -1
a31*20 + a32*49 + a33*10 + o3 = 0
/* +x axis */
a11*2303 + a12*30 + a13*50 + o1 = 1
a21*2303 + a22*30 + a23*50 + o2 = 0
a3/* +z axis */1*2303 + a32*30 + a33*50 + o3 = 0
/* -x axis */
a11*392 + a12*20 + a13*10+ o1 = -1
a21*392 + a22*20 + a23*10 + o2 = 0
a31*392 + a32*20 + a33*10 + o3 = 0
What is its purpose?
Why to add cubic factor here?
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