Runout, also called TIR for Total Indicator Reading, is the apparent radial motion of the surface of a turning rotor or shaft. It can be caused by the part not being round, or it can be caused because the center of rotation is not coincident with the geometric center of the part. When a proximity probe is used to sense the position of a shaft, it reads the location of the surface, and is therefore sensitive to runout, introducing an error in the measurement.
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