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JJG580-2005《焦度计检定规程》中对自动焦度计非线性的定义是:由于软件的过修正或其他非正常原因导致焦度计在镜片不同轴位方向所给出的测量值不一致、示值呈非规律性变化的误差。也就是说,焦度计在测量散光镜片时,不同轴位上显示的柱镜度数值不同,存在一定误差,该误差是不对称的。JJG580-2005规定使用+1.5m-1和-1.5m-1的柱镜标准片(外形为八角状的两块标准柱镜片)对焦度计的非线性误差进行检定,将外形为八角状(每角45°)的+1.5m-1和-1.5m-1的柱镜标准片分别置于焦度计
JJG580-2005 “pyrometer test procedures” on the definition of non-linear autofocus meter is: due to software over-correction or other non-normal causes of the power meter in the lens axis direction of the measured values given are inconsistent , Showing the value of non-regular changes in the error. In other words, the power meter in the measurement of the astigmatism lens, the different axial degrees displayed on different values of the cylinder, there is a certain error, the error is not symmetrical. JJG580-2005 provides for the calibration of non-linearity errors of the power meter using cylindrical lenses standard (octagonal two standard cylindrical lenses) of + 1.5m-1 and -1.5m-1, the shape of the octagonal shape Angle 45 °) of the + 1.5m-1 and -1.5m-1 cylinder standard pieces were placed in the focal meter