set the instrument
First place the theodolite on the measuring station. After centering and leveling, install the main unit of the rangefinder on the theodolite bracket, lock it with the connector fixing screw, insert the battery into the bottom of the main unit and fasten it. Place the reflective prism at the target point, center it, level it, and orient the mirror surface toward the host.
Observe vertical angle, air temperature and air pressure
Sight the center of the target plate with the cross wire of the theodolite, and measure the vertical angle α. At the same time, observe and record the readings on the temperature and barometer. Observing the vertical angle, air temperature and air pressure, the purpose is to correct the slope distance measured by the rangefinder, correct the slope, correct the temperature and correct the air pressure, so as to obtain the correct horizontal distance.
Ranging preparation
Press the power switch key "PWR" to turn on the machine, the host will self-check and display the original set temperature, air pressure and prism constant value, after the self-check is passed, it will display "good".
To correct the original set value, press the "TPC" key and then input the temperature, pressure value or prism constant (usually input one by one through the "ENT" key and numeric keys). Under normal circumstances, as long as the same type of reflector is used, the prism constant remains unchanged, while the temperature and air pressure may be different for each observation and need to be reset.
distance measurement
Adjust the horizontal adjustment handwheel of the aiming axis of the main engine (or the horizontal fretting screw of the theodolite) and the pitch fretting screw of the main engine, so that the rangefinder telescope can be accurately aimed at the center of the prism. In the "good" state, accurate aiming can also be judged according to the sound of the buzzer. The stronger the signal, the louder the sound. Move the rangefinder up, down, left and right to make the sound of the buzzer loudest, and the precise aiming is completed. "*".
After accurate aiming, press the "MSR" key, the host will measure and display the slope distance corrected by temperature, air pressure and prism constant. During the measurement, if the beam is blocked or the atmosphere is shaken, the measurement will be temporarily interrupted. At this time, the "*" will disappear, and the automatic measurement will continue after the light intensity is normal; if the beam is interrupted for 30 seconds, the light intensity must be restored, and then press " MSR" key to retest.
The conversion from the slant distance to the horizontal distance is generally carried out on the spot with a range finder. The method is: press the "V/H" key and then input the vertical angle value, and then press the "SHV" key to display the horizontal distance. Press the "SHV" key continuously to display the slope distance, horizontal distance and height difference in sequence.
