用威特 T_2经纬仪观测五等三角时,—开头,总是超限测回多,重测率大。和工程师技术员多次研究,未找到问题所在。后来,经过反复试验,从平常不大被人注意的仪器部件上查找异常情况才找到了毛病根源和消除方法。使用这一 Witt T_2 theodolite observed fifth-class triangle, - at the beginning, always exceed the limit to measure more, retest rate. And engineers repeatedly studied the technician, did not find the problem. Later, after repeated tests, it was found that the root cause of the malfunction and the elimination method were found by looking for the abnormal situation on the instrument components, which are usually noticed much. Use this one