How do I calibrate a level? How to calibrate the level

There are three parts to level calibration:

1) Inspection and correction of circular level.

1. Test method:

After placing the level, make the bubble of the circular level strictly centered, and the shaft of the circular level is in the plumb position. Rotate the telescope 180°, and if the bubble is still centered, the circular level axis is parallel to the vertical axis of the instrument.

If the axis of the circular level is not parallel to the vertical axis, after the level is rough, the angle of the circular level axis relative to the plumb line is an angle, the telescope is rotated 180°, the circular level axis is turned from the left side of the vertical axis to the right, the circular level bubble is no longer centered, and the angle between the circular level axis and the plumb line is an angle.

2. Correction method:

There are three correction screws at the bottom of the round leveling box. First turn the foot spiral, so that the center of the bubble moves to the center of the circle to half of the deviation value, at this time the vertical axis is in the lead straight position, and the remaining half uses the correction needle to dial the correction screw of the circle level, so that the bubble is centered, the correction should be repeated several times until the telescope rotates in any position, and the circle level bubble is centered.

2) Inspection and correction of cross wires.

1. Test method:

Place the instrument about 20 meters away from the wall, and make an obvious fixed point on the wall, preferably a black triangle, first use one end of the cross wire to align a vertex on (or down) the black triangle or read the ruler. Tighten the horizontal brake spiral, rotate the horizontal fretting spiral, if the fixed point always moves on the transverse wire or the reading remains unchanged, it means that the transverse wire is perpendicular to the vertical axis of the instrument, if it deviates from the transverse wire, it should be corrected.

2. Correction method:

Open the shroud, loosen the chariass reticle set screws, and rotate the chariass reticle base until it is in the correct position. This correction also needs to be repeated.

3) Inspection and correction of the level pipe.

1. Test method:

1) Select fixed points A and B about 100 apart on the flat ground, first place a level at the midpoint of A and B, and measure the height difference between A and B. If there is a fixed angle between the two axes, the error of the angle to the front and rear view readings is the same because the front and rear view distances are equal, then the resulting height difference is still the correct height difference. Therefore, the front and rear sight distances are equal, which can eliminate the influence of the angular error caused by the non-parallel axis of the sight axis and the horizontal tube axis.

2) The instrument is moved about 2 3 away from point A (or point). The reading distance from the meter point of the instrument is close, and the reading can be considered correct. After leveling, a two-point ruler reading is taken. If the height difference is consistent with the height difference where the instrument is placed in the middle, it means that the instrument does not need to be calibrated, otherwise it needs to be corrected.

2. Correction method:

Because the instrument is very close to the point, the error is small, so it is considered that the reading error is omitted. After the instrument takes the ruler reading at point A, plus the height difference of the instrument in the middle of the reading, it is the reading from point B of the instrument.

The correction of the leveling tube, according to the calculation results of the above formula, rotate the slight tilt spiral to align the cross wire transverse wire with the reading place on the B point ruler, at this time the collimation axis has been level, but the bubble of the leveling tube is not centered, loosen the two correction screws on the left and right of the leveling tube, and turn the correction screws up and down the leveling tube to make the bubble centered, and the condition that the two axes are parallel can be achieved.

In daily use, the level should be tested before use, the method is very simple: find a distance of 30-60 meters, put a tower ruler on both sides, and place the level level in the middle of the two feet, find out the height difference, note: at least three rounds.

Then move the instrument to a distance of 3-5 meters from the tower ruler at one end and measure it. If the error exceeds the target after measurement, it is corrected. Because there is already a height difference, it can be directly corrected, and the correction is based on the near tower ruler target, and the distant tower ruler target is corrected.

The structure of various levels is different, look at the instructions of the level, anastomosis, and correct the long level. The automatic compensation is usually opened by opening the cover in front of the eyepiece and the correction screw is visible.

I wipe, and I found it from **, first put the instrument between two points, measure the height difference between two points, write down the height difference, and then put it on the extension line of the two points to continue to measure the height difference between the two points, and compare the difference between the two height differences!!

The spirit level is calibrated as follows:

How the spirit level is calibrated.

First to level a plane, then turn the level to another plane, if this plane is uneven, use the needle to rotate the bubble at the spiral, level it, and then turn it to a plane to adjust, only after the three sides are leveled.

What to pay attention to when using a spirit level.

1. Before using the instrument to measure, the surface should be wiped clean with water, and at the same time, it should be checked whether there are some scratches, rust and other problems on the surface of the instrument. If there are any problems, they must be dealt with immediately to prevent inaccurate measurement due to the instrument.

2. Also check whether this instrument is zero, if it is not in the zero position, you need to adjust this level before you can use it. When adjusting, the instrument should also be placed on the plate so that the scale of the bubble tube can be read.

3. When measuring, the temperature should also be paid attention to, and the use of the level will also be affected by some ambient temperatures, so it is best to avoid the high temperature environment, or it will not affect the reading of the instrument. When in use, the instrument should not be exposed to direct sunlight, let alone breathe on the level, or it will have some impact on the reading of the level.

4. When using, the position of the vertical level should be read to prevent some errors in the reading, and the results will also have an impact on the measurement.

5. The level should also pay attention to the storage problem, it must be placed in a dry and ventilated environment, and some radiation objects can not be placed nearby, so as to prevent the instrument from being damaged.

Correction method. Place the instrument in the middle of two fixed points, mark the horizontal line of the two points, called line A and B, and move the instrument to one end of the fixed point to mark the horizontal line of the two points, called A', B'.

Calculate the value of half the deviation of the telescope wire alignment if a b≠ a' b '. Use a calibration needle to adjust the upper and lower screws of the level to make the horizontal bubble of the tube anastomosis.

Repeat until equal.

To calibrate the flat panel, you can select a certain distance, measure with a tower ruler and measure the distance with the actual meter ruler (actual result), establish a mathematical model, and find the instrument constant (correction coefficient): the actual distance kx+b. where:

k is the instrument coefficient, b is the constant, and x is the observation distance (the number of tower distances).

Most digital electronic levels now have a built-in self-calibration program, i.e. a 180-degree correction of horizontal rotation. The bubble type mainly depends on whether the measurement base is worn, if there is a need for scraping treatment, it is best to send it to the local metrology institute to complete.

Summary. Place the spirit level on a flat plate (or machine rail) with a stable foundation and roughly level, and after the bubbles are stable, read at one end as the left end, and set it to zero. Then turn the level 180 degrees, still put it in the original position of the plate, after the bubble is stable, still read at the original end (left end), read out a grid, then the level zero is an error of half a grid.

If the zero error exceeds the allowable range, it is necessary to adjust the zero adjustment mechanism of the level, adjust the screw or nut, and reduce the zero error to the allowable value. For screws and nuts that are not adjusted according to the regulations, they shall not be twisted at will. Before adjustment, the working surface and the plate of the level must be wiped clean, and the screws or nuts and other parts must be tightened after adjustment.

How to calibrate the level

Hello, I am helping you to inquire about the relevant information and will reply to you immediately.

The level is divided into mechanical level and electronic level, in which the mechanical level is in the process of calibration, it must be guaranteed that it is above zero, and then the level is placed on the plate, read out a scale of the bubble tube, the plane of the plate is in the same position above the level will be flipped left and right 180 degrees, and then read out the scale inside the bubble tube, if the reading is the same, then it means that the bottom surface of the level and the bubble tube are in a parallel state, if the reading is different, it means that it is inconsistent This time can be inserted into the adjustment hole, Adjust up and down until the scale of the bubble tube is consistent.

If it is an electronic level, when measuring the levelness of the two orthogonal directions of the plane, it can be measured synchronously, wherein, in the process of measurement, the levelness of the x-axis and the y-axis will be displayed, and the verticality of the horizontal direction and the vertical direction can also be measured on a single axis, and in the process of electronic level calibration, click the relevant button, you can complete the horizontal adjustment of 180 degrees, and you can automatically correct its verticality and levelness.

I'm talking about infrared levels, ordinary.

Place the spirit level on a flat plate (or machine rail) with a stable foundation and roughly level, and after the bubbles are stable, read at one end as the left end, and set it to zero. Then turn the level 180 degrees, still put it in the original position of the plate, after the bubble is stable, still read at the original end (left end), read out a grid, then the level zero is an error of half a grid. If the zero error exceeds the allowable range, it is necessary to adjust the zero adjustment mechanism of the level, adjust the screw or nut, and reduce the zero error to the allowable value.

For screws and nuts that are not adjusted according to the regulations, they shall not be twisted at will. Before adjustment, the working surface and the plate of the level must be wiped clean, and the screws or nuts and other parts must be tightened after adjustment.

Correction method.

Place the instrument in the middle of two fixed points, mark the horizontal line of the two points, called line A and B, and move the instrument to one end of the fixed point to mark the horizontal line of the two points, called A', B'.

Calculate the value of half the deviation of the telescope wire alignment if a b≠ a' b '. Use a calibration needle to adjust the upper and lower screws of the level to make the horizontal bubble of the tube anastomosis.

Repeat until equal.

Answer, hello, I am honored to answer your question, my own calibration is to put the instrument on the left and right with a A, B ruler 50 meters in the middle, leveling, read the ruler reading A1, B1 Lai Yuantou.

2: Place the instrument about 2 meters from point A or point B (point C), level it and read the ruler readings A2, B2

3: If A1-B1 is equal to A2-B2 then the instrument does not need to be calibrated, if A1-B1 is not equal to A2-B2 then the instrument needs to be calibrated, 4; Calibrate at point C, open the back cover of the instrument eyepiece and see a cross correction screw Use the correction needle to correct the reticle and align the reticle mark on the scale b2=a2-(a1-b1) 5: Repeatedly check and correct until the error is less than the specified value 6:

Calibrate on the collimator (professional repair instrument shop), open the back cover of the instrument eyepiece to see a cross correction screw, use the correction needle to correct the reticle so that the reticle mark coincides with the cross wire on the collimator.