Determination about electronic theodolite horizontal angle observation position number

Electronic theodolite,total station measuring angle’s technique is rather advanced,it overcomes a lot of errors of optical theodolite measuring angle.But observation of horizontal angle by electionic theodolite still needs to be made according to optical theodolite operation criterion because there are no electionic theodolite opertion criterion.By analysing a great deal of exeriment data,the auther concludes relation between horizontal angle observation accuracy of electionic theodolite and position number,and it contrasts to optical theodolite\s operation certerion, and horizontal angle observation position number by electionic theodolite observing in difference order is determined.Using the conclusion we can develop fully the advantage advance of electionic theodolite,save time,raise work efficiency.