How to correct the tube-level bubbles on the prism base?

Make the bulb parallel to any two feet, tighten the bulb, then level the bulb with the foot screw, then rotate the bulb by 180 degrees, and the bulb will deviate. Adjust the foot screw 1/2, then level the bulb screw, and so on.

Calibration method: put the instrument between two fixed points and mark the horizontal lines of two points, which are called lines A and B. Move the instrument to one end of the fixed point and mark the horizontal lines of two points, which are called lines A' and b'.

If A-B ≠ A'-B' is calculated, the horizontal line of the telescope will be aligned with half deviation. Adjust the upper and lower screws of the level with the calibration needle until the horizontal bubbles in the test tube match. Repeat the above practice until it is equal.

Extended data:

maintenance and repair

1. Level is a precise optical instrument, and its correct and reasonable use and storage play a great role in the accuracy and life of the instrument.

2. Avoid direct sunlight and don't disassemble the instrument casually;

3. Turn it gently every time you fine-tune, not too hard. Glasses and optical films are not allowed to be touched by hand;

4. If the instrument is faulty, it should be repaired by someone familiar with the instrument structure or the repair department;

5. After each use, clean the instrument and keep it dry. Theodolite optical theodolite is a kind of precious precision instrument, which should be cherished and protected. The correct use method should be followed to avoid accidental damage to the instrument.

6. Therefore, when using the theodolite, the following points should be done: l Before using the theodolite, read the instructions of the instrument carefully and be familiar with the structure of each part of the instrument, the function and operation method of each screw. When operating and rotating the screw, there should be a sense of tightness.

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