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28
2023
-
03
How to use the level
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The scale value of the level gauge is expressed in terms of angle (seconds) or slope, which means the angle at which the bubble is offset by one grid of work tilt, or the height at which the bubble is offset by one grid of work surface tilt over a length of one meter. Due to the small inclination angle of the level used, tg, such as tg4 4 radian=0.02mm/1000mm, should be measured so that the working surface of the level is close to the surface being measured, and readings can only be taken after the bubbles stabilize. If it is necessary to measure the actual inclination value with a length of L, it can be calculated using the following formula. Actual inclination value=nominal graduation value L deviation grid number; For example, if the nominal graduation value is 0.02mm/m, L=200mm, and the number of deviation grids is 2, then
Actual inclination value=0.02/1000 * 200 * 2=0.008mm. To avoid measurement errors caused by inaccurate zero position of the level, it is necessary to check or adjust the zero position of the level before use.
The method for checking and adjusting the zero position of the level gauge is to place the level gauge to be calibrated on a roughly horizontal flat plate, close to the positioning block, wait for the bubble to stabilize, and then read a1 at one end of the bubble. Then, turn the level gauge 180 degrees to accurately place it in its original position. Record the reading of a2 at the other end of the bubble according to one side of the initial reading, and half of the difference between the two readings is a zero position error, that is,=(a1-a2)/2 grid. If the zero position error exceeds the allowable range, it is necessary to adjust the zero position mechanism, as shown in Figure 1. The requirement can be met by repeatedly adjusting the screw 1.
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