using and operating a photoelectric distance meter
Install 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 make the mirror surface face 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 temperature and barometer readings. Observing the vertical angle, air temperature and air pressure, the purpose is to correct the slant distance measured by the range finder, such as tilt correction, temperature correction and air pressure correction, so as to obtain the correct horizontal distance.
ranging preparation
Press the power button "PWR" to turn on the machine, the host will perform a self-inspection and display the original set temperature, air pressure and prism constant value, and will display "good" after the self-inspection passes.
If the original set value is corrected, you can press the "TPC" key and input the temperature, air pressure value or prism constant (generally input one by one through the "ENT" key and number keys). In general, as long as the same type of reflector is used, the prism constant remains unchanged, but the temperature and air pressure may be different each time it is observed, and need to be reset.
distance measurement
Adjust the horizontal adjustment handwheel (or theodolite horizontal micro-motion screw) of the main engine's collimating axis and the main machine's pitch micro-motion screw to make the rangefinder telescope precisely aim at the center of the prism. In the state of "good", accurate aiming can also be judged by the sound of the buzzer. The stronger the signal, the louder the sound. Move the rangefinder up, down, left, and right to make the buzzer sound the loudest, and the precise aiming is completed. "*".
After precise 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 shakes, etc., the measurement will be interrupted temporarily, and the "*" will disappear at this time, 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 site with a range finder. The method is: press the "V/H" key and input the vertical angle value, and then press the "SHV" key to display the horizontal distance. Continuously press the "SHV" key to display the slope distance, horizontal distance and height difference in sequence.
