七、光学分度头光学分度头是精密角度计量仪器，与其它定位装置（准直仪、指示表、阿贝测体）配合进行角度测量、分度测量和坐标测量。光学分度头按其读数方式可分为目镜式、影屏式和数字式三类。按其精度高低大致分为低精度、中精度和高精度三级。本文以使用较普遍的５″... Optical Indexing Head The optical indexing head is a precision angle measuring instrument that is used with angle measuring, indexing and coordinate measurement with other positioning devices (collimator, indicator, Abbe test). Optical dividing head according to their readings can be divided into eyepiece, screen and digital three categories. According to the level of their accuracy can be divided into low-precision, precision and high precision three. This article to use the more common 5 "...