Operation and Use of Photoelectric Distance Measuring Instruments
Placement of instruments
First, install the theodolite on the measuring station, align and level it, then install the distance measuring instrument host on the theodolite bracket, lock it with connector fixing screws, and insert the battery into the bottom of the host and fasten it. Place a reflective prism at the target point, align and level it, and make the mirror face towards the host.
Observing vertical angles, temperature, and air pressure
Align the center of the target plate with the cross thread of a theodolite and measure the vertical angle α. At the same time, observe and record the readings on the temperature and pressure gauges. Observing the vertical angle, temperature, and air pressure is aimed at correcting the inclination, temperature, and air pressure of the distance measuring instrument to obtain the correct horizontal distance.
Distance preparation
Press the power button "PWR" to turn on the computer. The host will self check and display the original set temperature, air pressure, and prism constant values. After passing the self check, it will display "good".
If the original set value is corrected, you can press the "TPC" key and enter the temperature, pressure value, or prism constant (usually entered one by one using the "ENT" key and number keys). In general, as long as the same type of reflector is used, the prism constant remains unchanged, while temperature and air pressure may vary from observation to observation and need to be reset.
Distance measurement
Adjust the horizontal adjustment handwheel (or theodolite horizontal micro screw) and the main engine pitch micro screw to accurately aim the rangefinder telescope at the center of the prism. In the display of "good" status, precise aiming can also be judged based on the sound of the buzzer. The stronger the signal, the louder the sound. Move the rangefinder up, down, left and right to maximize the sound of the buzzer, completing precise aiming with a "*" appearing.
After precise aiming, press the "MSR" button, and the host will measure and display the slant distance corrected by temperature, air pressure, and prism constant. In measurement, if the beam is blocked or there is atmospheric shaking, the measurement will be temporarily interrupted, and the "*" will disappear. After the light intensity is normal, automatic measurement will continue; If the beam is interrupted for 30 seconds, the light intensity must be restored before pressing the "MSR" button to retest.
The calculation of oblique distance to horizontal distance is generally carried out on site using a rangefinder. The method is to press the "V/H" button, enter the vertical angle value, and then press the "SHV" button to display the horizontal distance. Continuously pressing the "SHV" key can display oblique distance, horizontal distance, and elevation difference in sequence.
