Learning target: At the end of this unit, you will be able to select both the stylus system and the stylus suitable for the measuring task at hand. You will know the technical and mathematical process of stylus qualification of the reference sphere and the qualification sequence. You will understand the process of stylus sphere radius and stylus tip bending corrections. You will know in principle that the stylus sphere acts a mechanical filter as a function of the radius. You will have developed a feeling for sequence errors in case of imprecise qualification and calibration errors.

In this unit, you will learn how to select and qualify styli. Stylus system selection Stylus selection Probing Stylus qualification     You will learn to take into account the mechanical filter effect and to minimize calibration errors. Mech. filter effect Calibration errors    At the end, there will be as always a summary of the subject-matter of the unit. Summary