1.2.3.2.3.2.2 Tangential displacement (t)
This displacement is along the direction of the disc rotation. It is typically less crucial than the radial
displacement because the measured field doesn’t change as much along this axis. It reduces the absolute
position accuracy.
1.2.3.2.3.2.3 Mounting eccentricity or radial runout (e)
The radial runout (or eccentricity) is a common inaccuracy of the rotating mechanical system. It has a direct
effect on the encoder system in terms of performance and robustness. Hence, it should be as minimal as
possible. Please refer to our encoder calibration guide for more information about influence of the radial
runout on encoder performance.
Typically, the runout can be measured with a dial indicator pressed against the rotating component during
rotation. Additionally, a periodic once-a-revolution distortion will be present in the velocity feedback signal.
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