1. Align and level the instrument, turn it on to enter the main menu and enter the lofting program. The station is at a known point: then start to build the station, first input the coordinates of the station, then input the coordinates of the rear viewpoint according to the prompt, aim the instrument at the rear viewpoint, and then press the ranging button. After the measurement is completed, the site will be established.

2. At this time, it is necessary to measure the back viewpoint reversely to see how much the measured back viewpoint coordinates differ from the coordinates you entered. If it is within the allowable range, you can proceed to the next step. If not, we need to find out why. The reasons come from three aspects: instrument problem, human problem and point coordinate problem. After solving, you can enter the next step of lofting.

3, according to the instrument prompt input lofting point coordinates, after the input, the general instrument will display the angle * * * distance * * This means that according to the data you input, the instrument will calculate the relationship between the lofting point and the site, and then press the ranging button or the next button to enter an interface with constantly changing horizontal angle.

4, turn the instrument to the horizontal angle data display is near 0 0 minutes 0 seconds, and then adjust the instrument to 0 0 minutes 0 seconds with horizontal fretting, that is to say, the point to be set out is on this line. In front of the instrument, another person pointed a prism at the instrument. For example, it will display -30m or +30m when measuring. The point you want to put on the surface will move forward or backward by 30 meters. Inconsistency with the symbol indicates that the forward or backward movement may be different.

5. The person holding the prism will move forward or backward according to the operator's instructions. When the measured data bit is+10 cm, the pile can be driven, and then the pile can be accurately positioned. When the accuracy is good, this point is put away.

Extended data:

Matters needing attention in using total station

1, check whether the instrument box strap and handle are firm before construction.

2. Before taking the instrument out of the box, be sure to see the way and position of the instrument in the box. When loading and unloading instruments, you must hold the handle. When taking the instrument out of the instrument box or loading it into the instrument box, please hold the handle and base of the instrument, not the lower part of the display unit. Never take the lens barrel of the instrument, otherwise it will affect the internal fixed parts, thus reducing the accuracy of the instrument.

3. When observing the instrument in the sun, you should give the instrument an umbrella and wear a sunshade to avoid affecting the observation accuracy. When measuring in a dirty environment, the instrument should be guarded by a special person. When the instrument stands on a smooth surface, connect the three legs of the tripod with a thin rope (or thin lead wire) to prevent sliding.

4. When erecting the instrument on a tripod, try to use a wooden tripod, because using a metal tripod may cause vibration, thus affecting the measurement accuracy.

5. When the distance between stations is far away, the instrument should be unloaded and packed away when moving stations. Check whether the instrument box is locked and the safety belt is fastened before walking. When the distance between stations is very close, the instrument can lean on the shoulder with the tripod when moving the station, but the instrument should be kept upright as far as possible.

6. Before moving the workstation, please check whether the connection between the instrument and the tripod is firm. When handling, the brake screw should be slightly closed to prevent the instrument from shaking during moving the station.

References:

Baidu encyclopedia-survey lofting

References:

Baidu encyclopedia-total station