Operation Instructions

1. Set up the tripod

Place the tripod over the survey point.Spread the legs firmly and press them into the ground.Adjust the tripod so the head is approximately level.

2. Mount the theodolite

Secure the instrument to the tripod using the mounting screw.Ensure it is tightly fastened.

3. Center the instrument

Position the theodolite directly above the survey marker using the optical plummet or plumb bob.Adjust the tripod legs until the instrument is centered.

4. Level the theodolite

Use the foot screws to center the circular bubble.Then use the plate level (or electronic level on digital models) for precise leveling.Repeat until the bubble remains centered when the instrument is rotated.

5. Focus the telescope

Adjust the eyepiece until the crosshairs appear sharp.Aim at the target and adjust the focusing knob until the image is clear.

Check for parallax by moving your eye slightly; if the crosshairs appear to move relative to the target, refocus.

6. Set the horizontal angle

im the telescope at your reference point.Set the horizontal angle to 0°00′00″ (or note the current reading if you are not zeroing it).

7. Measure the angle

Rotate the telescope to the second target.Lock the horizontal motion.

Use the fine adjustment screw to align the crosshairs precisely.Read and record the horizontal angle.

8. Measure the vertical angle

Tilt the telescope to the desired target.Lock the vertical motion.

Use the fine adjustment screw for precise alignment.Read and record the vertical angle.

9. Repeat for accuracy

Professional surveyors usually measure each angle twice:Once with the telescope in the normal (face left) position.

Once after reversing the telescope (face right).Average the readings to reduce instrument errors.