Typically, the actual static characteristic output of the sensor is a bar curve rather than a straight line. In actual work, in order to make the meter have a uniform scale reading, a fitting line is usually used to approximate the actual characteristic curve, and linearity (non-linearity error) is a performance index of this approximation.
There are several ways to select a fitted line. For example, the theoretical straight line connecting the zero input and the full-scale output point is used as the fitting straight line; or the theoretical straight line with the smallest square of the deviation of each point on the characteristic curve is used as the fitting straight line, and the fitting straight line is called the least squares method. Straight line.
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