An eccentricity error mathematic model was built up based on the measurement principle of the optical angular encoder and error analysis.

通过对光栅角编码器测角原理和偏心误差产生原因的分析，建立了偏心误差模型。

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With a collimator and a 23 polyhedron as measuring datum, a set of optical angular encoder measuring data, which containing the eccentricity error, was obtained.

以平行光管和23面棱体为基准，得到存在偏心误差的一组光栅角编码器测量数据。

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