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经纬仪检定中规定:用高平点检定横竖轴垂直度时,水平盘读数只在一个方位进行顺转和逆转两个测回。我通过对几台经纬仪的检测,认为这一项应该在度盘全方位进行,所以在此提出来与同行们探讨。在水平盘平点上读得照准差2C=L-R±180°不仅包括视准轴与横轴的垂直度,还包括度盘偏心。如果只在度盘一个方位读数,便不能真实地反映2C的实际值及横竖轴的垂直度i。现有对某单位Theo 020 B经纬仪检定记录,见表(表中读数值均为两次读数的平均值)。从表中可以看出:如果只在某一方位读数得出2C(例如0°,2C=25″,DJ6要求<20″),很可能判定2C不合格,显然这是由
Theodolite test provides: With the high flat point test vertical and horizontal axis verticality, the horizontal plate readings in only one direction of rotation and reversal of the two measured back. I passed the inspection of several theodolites, I think this one should be carried out in all aspects of the dial, it is proposed to explore with colleagues. Readable at flat spot on horizontal plate 2C = L-R ± 180 ° Includes not only the verticality of the collimation axis and the horizontal axis, but also the eccentricity of the dial. If only one azimuth reading of the dial can not truly reflect the actual value of 2C and the vertical and horizontal axis i. The existing record of a Theo 020 B theodolite test records, see table (the table reading values are the average of two readings). As can be seen from the table, 2C is most likely to be judged as unacceptable if 2C is only obtained at a certain azimuth reading (eg 0 °, 2C = 25 “, DJ6 requires <20”)