Uniform and non-uniform disc patterns can be utilized depending on the application. Virtually any pattern which can be produced photographically can be imaged on an encoder disc. The typical application is measurement of shaft position which utilizes a uniform pattern. Any non-uniformity in the disc is a source of error. Non-uniform segment spacing produces position error and eccentricity causes an error which is a sinusoidal function of the shaft angle.Performance specifications are limited for factors such as, practical segmenting limitations on discs,bridging of disc segments, and wear of contacts.
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