Introduction to Optical Rangefinder Distance Measurement
To properly position the rangefinder telescope at the center of the prism, adjust the collimating axis' horizontal adjustment handwheel (or theodolite's horizontal micro-motion screw) and the main machine's pitch micro-motion screw. Accurate aiming can also be assessed by listening for the beep to indicate "good" aim. The sound is louder the stronger the signal. The accurate aiming is finished by moving the rangefinder up, down, left, and right until the buzzer sounds the loudest.
Press the "MSR" key after accurately pointing, and the host will measure and show the slope distance adjusted for temperature, air pressure, and prism constant. The measurement will be temporarily interrupted if the beam is blocked, the atmosphere trembles, etc., during the measurement. At this point, the "*" will vanish, and the automatic measurement will resume once the light intensity is normal. If the beam is interrupted for longer than 30 seconds, the light intensity must be restored before pressing the "MSR" key to retest.
Typically, a rangefinder is used on site to convert the slant distance to the horizontal distance. Input the vertical angle value by pressing the "V/H" key, and then hit the "SHV" key to display the horizontal distance. Press "SHV" repeatedly to have the height difference, horizontal distance, and slope distance displayed in that order.
