Figure L 22: Process for determining a linearity error
The linearity error corresponds to the maximum difference in gradient or the maximum deviation between the target characteristic curve (straight lines) and the actual characteristic curve for the measuring instrument. The size of the deviation can be determined in various ways (Figure L 22):
- Fixed point method: both end points are connected to each other (a);
- minimum quadratic deviation through the zero point (b);
- minimum quadratic deviation with two intersections (tolerance range method, c).