How to calibrate the error of the level
A level ruler is a measuring instrument that uses the principle of liquid level to directly display angular displacement using a level bubble, and measures the degree of deviation of the measured surface from the relative horizontal, vertical, and inclined positions.
The level ruler is mainly used to detect or measure the level and verticality, and can be divided into various specifications such as aluminum alloy square tube type, I-shaped, die-casting type, plastic type, irregular shape, etc; Multiple specifications ranging from 10CM to 250CM in length; The flatness of the level material and the quality of the leveling bubble determine the accuracy and stability of the level.
A level ruler with horizontal bubbles can be used for inspection, measurement, marking, equipment installation, and industrial engineering construction. It can be used for both short distance and long-distance measurements, and also solves the problem of existing level instruments being limited to measuring in open and narrow areas. It has the advantages of accurate measurement, low cost, easy portability, and economic applicability.
How to use a level ruler
A typical level ruler has three glass tubes, each containing a bubble.
Place the level ruler on the object being measured. If the bubble of the level ruler is biased towards a certain side, it indicates that that the other side is higher. That is, it is necessary to lower the height of that side or raise the height of the opposite side. Adjust the bubble to the center, which means that the object being measured is horizontal in that direction.
In principle, both horizontally and vertically are in the center, and the angled bubbles are naturally in the center as well. The horizontal glass tube is used to measure the horizontal plane, the vertical glass tube is used to measure the vertical plane, and the other one is generally used to measure a 45 degree angle. The three water bubbles are used to measure whether the measuring plane is horizontal. If the water bubble is centered, it is horizontal, and if it deviates from the center, the plane is not horizontal.
In addition, according to the principle of determining a plane by two intersecting lines, it is necessary to measure two non parallel positions within the same plane in order to determine the level of the plane.
How to calibrate the error of a level ruler
1. Zero position error calibration of horizontal position
After the bubble stabilizes, read a at one end of the bubble in a horizontal position. Then, turn the level ruler 180 degrees and place it in the original position on the flat plate. Record the reading b at the other end of the bubble according to the first reading. Half of the difference between the two readings is the zero position error.
2. Zero position error calibration of vertical position
Adjust the dividing head so that one end of the bubble in the horizontal position aligns with the long engraved line. Turn the dividing head 90 degrees and read c at the corresponding end of the bubble in the vertical position. Add c to the zero position error in the horizontal position to obtain the zero position error in the vertical position.
3. Zero position error calibration at 45 degree position
Adjust the dividing head so that one end of the bubble in the horizontal position aligns with the long engraved line. Turn the dividing head 45 degrees and read d at the corresponding end of the bubble at the 45 degree position. Add d to the zero position error in the horizontal position to obtain the zero position error at the 45 degree position.
