Application skills of the hottest Su Yiguang theod

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Introduction: Su Yiguang theodolite is made of photoelectric technology and angle measurement principle. It is widely used in engineering measurement of railways, highways, bridges, water conservancy, mines and other aspects. Most people know the purpose of Su Yiguang theodolite, but few friends know its use skills. How should it be used? What should we pay attention to when using? This article discusses it together

1. Su Yiguang theodolite azimuth calibration

theodolite is a very important detection equipment in high-altitude meteorological detection. Whether its calibration is accurate directly affects the "three properties" requirements of detection data. The azimuth orientation methods of theodolite include Polaris method, fixed target method and magnetic needle method. The azimuth of the selected fixed target must be measured with Polaris, and the azimuth angle difference between the fixed target and true north is measured and obtained. Since the position of Polaris is not fixed, but rotates around the celestial sphere at the north pole at any time, it should be measured at different times when calibrating the fixed target at the initial stage of the station. The general calibration method is to calibrate the zero point by aiming at Polaris on a clear night. As Polaris is a star, the earth rotates around the earth's axis, and there is a deflection angle of about 1 ° between the earth's axis and Polaris, the maximum deviation of Polaris' position change within one day may reach 2 °. To make the calibration more accurate, you can observe the actual orientation of Polaris at 21:00, 24:00, 03:00, 06:00, etc., and then calculate its average value for calibration. You can also check and correct the astronomical calendar. The correction method is as follows: if the actual position of Polaris at 22 o'clock of a station is 0.8 ° by checking the astronomical calendar, align Polaris with a theodolite, adjust the azimuth angle value to 0.8 °, and then end the orientation. Then, the white before and after the strong pressure can be measured and recorded, and the arc height telescope can be aligned with the selected fixed target, so that the target falls on the center of the reticle, and its angle value can be measured. Later, when using the theodolite in the daytime, the fixed target can be used for orientation. The selected fixed target must be significant and fixed, 250m away from the tip of a tall building outside the theodolite. In order to reduce the error, the volume of the selected fixed target should be as small as possible

2. The erection of Su Yiguang theodolite

the theodolite is equipped with a tripod. The height adjustment and erection of the tripod are closely related to the height of the observer and the terrain of the erection point. If the platform on the top of the tripod is not level during erection, it is not conducive to the horizontal adjustment of the theodolite and affects the speed of observation preparation. In particular, if the ball is not placed in time, it may cause the consequences of missing some records. Therefore, if it is a fixed station, make a fixed pier with cement or steel pipe next to the radar, and put the theodolite on it, which is conducive to the horizontal adjustment of the theodolite. It saves time minutes than using a tripod to adjust the level, and can effectively avoid the tripod sliding and damaging the theodolite

3. The orientation of Su Yiguang theodolite

after setting up the theodolite and adjusting the level, it can be observed by aiming at the fixed object, power on self-test and orientation. However, in the process of operation, it is often encountered that when the azimuth angle value of the fixed target is adjusted by using the plus and minus keys during orientation, to a certain extent, the plus and minus keys will lose their function and can no longer be adjusted. After tracing the reason, it was found that the orientation of the theodolite initially took the true north as the target, and the maximum value that can be added or subtracted was emphasized in the instruction manual as 180 °, that is, the fixed target is in the East (or West) of the true north, and the data position can only be adjusted to 180 ° with the plus key (or minus key), that is, the adjustment cannot cross 180 °. For example, when the fixed target is adjusted from 75 ° to 232 °, the addition and subtraction keys can only be used in the way of subtraction (over true north) but not in the way of addition (over true South)

4. Su Yiguang theodolite observation balloon

the most difficult thing for theodolite observation balloon is to start the steps of catching the ball, especially putting the small ball back. You must catch the ball in the first minute to reduce the body weight. Because it is not often used, most observers are not very skilled in catching the ball. In addition to often practicing and mastering skills, you should also pay attention to the use of small objective lens when starting "high molecular materials while saving energy, so that the angle of view is wide, and it is easier to catch the ball. After catching the ball, switch to large objective lens to reduce the error. Before observing the theodolite, you should also calculate its device error for correction.

5. Change the sampling interval of Su Yiguang theodolite

(1) press and hold the" observation "key first, and then press the" start "key, Enter the setting of sampling interval

(2) use the "+" or "-" key to select the desired sampling interval

(3) select the sampling interval and press the "shut down" key to shut down. The selected sampling interval becomes the default sampling interval when the theodolite is turned on. When it is used again, only when the sampling time interval is changed, it is necessary to reset it by screwing down the screw

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