How are common measuring instruments used?
Reading。 When the bubble center, immediately according to the cross wire in wire on the standard scale readings. Whether the level is used as or like, reading notes always by small end to end readout. The usual reading retains four digits.
Reading。 When the bubble center, immediately according to the cross wire in wire on the standard scale readings. Whether the level is used as or like, reading notes always by small end to end readout. The usual reading retains four digits.
Focusing and collimation. After the leveling leveling, the telescope against a bright background, eyepiece focusing screw rotation, the cross wire clear; telescope sight and light door aiming level ruler, and then tighten the clamp screw fixed telescope; objective lens focusing screw rotation, the level ruler clear image, then turn the level of micro screw, the cross wire vertical wire alignment level ruler; aim, eye in the eyepiece for moving up and down, such as the discovery of the cross wire and the target image are relatively mobile, reading change with the eye movement, the causes of disparity; parallax is the target image and the cross wire reticle do not coincide, it will affect the correctness of reading; we must eliminate the disparity, way is to see the cross adjustable eyepiece focusing screw, and then continue to carefully turn the lens focusing screw, until the feet and the cross wire like plane.
Place level and rough level. To find a flat, solid ground as the level of the settlements, then open the three foot high moderate, roughly the level of the first frame, and the connecting spiral will be fixed on the three level tripod head, the leg toes trampled. Adjust the spiral of the three feet, so that the circle level bubbles in the center, known as rough flat.
