by Ricardo Vilmenay
This article not only exposes some of the technical risks associated with calibrating at only three points but also focuses on one of the most common and difficult-to-detect errors: the Type “S” non-linearity error. This type of deviation may align with the ideal line at the extreme points and the midpoint, but it presents hidden curvature in the intermediate areas (e.g., 25% and 75%). It can only be evidenced through more robust calibration programs, such as implementing five points distributed throughout the calibration range.
