大地经纬仪的度盘直径一般为140毫米。
Geodetic theodolites generally have circles of about 140mm diameter.
分析了大地测量仪器望远镜调焦运行误差产生的原因，并以经纬仪为例，介绍一套利用JSJ综合检验仪对其调焦误差进行检定的方法。
Meanwhile, the method that tests the focus running error by using JSJ integrating inspection instrument through an example of theodolite is introduced.
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