The normal use of the scale, the correct use of the scale

Here's how to use the scale:1. First of all, it is necessary to observe the zero scale, range and indexing value of the scale.

2. Correctly place the scale ruler: when measuring, the ruler should be along the measured length, not skewed, and the side with the scale should be close to the measured object, so that the zero scale of the scale ruler or a whole scale should be aligned with one end of the measured object (no wear zero scale line as the starting point).

3. Correct reading: when reading, the line of sight is facing the scale, and it is perpendicular to the ruler surface, and the next digit of the graduation value should be estimated and read; If the object to be measured is not aligned to a certain scale, it should be filled with zero, such as the length of the object measured with a millimeter scale is exactly 10 millimeters on the scale, and the reading should be read in millimeters or centimeters.

4. Correct recording: Measured values are made up of accurate values, estimates, and units.

Precautions for the use of the scale1. Select the appropriate scale according to the measurement length and the minimum scale needs.

2. The scale should be straightened, and the scale mark should be close to the object to be measured.

3. The line of sight is perpendicular to the scale and the measured object.

4. In addition to reading the minimum scale value and above, it is also necessary to estimate the next digit of the minimum scale value.

The correct way to use the scale is as follows:1.Choose the right one: choose the appropriate scale according to the measurement length and the minimum scale needs;

2.Put it correctly: the scale should be straightened, and the scale mark should be close to the measured object;

3.Look correct: the line of sight is perpendicular to the scale and the object to be measured;

5.Correct: Measured value = accurate value + estimated value + unit.

The first thing to know about the scale:

1.What is the measuring range;

2.whether the zero scale is worn;

3.What is the graduation value;

When in use: 1The scale should be aligned with the part being measured;

2.Let the graduated side of the scale fit snugly against the part to be measured;

3.The line of sight should be perpendicular to the ruler surface when reading;

4.When reading, the result should be estimated to the next digit of the graduation value;

5.Record data to write units;

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The correct way to use the scale is as follows:1.Choose the right one: choose the appropriate scale according to the measurement length and the minimum scale needs;

2.Put it correctly: the scale should be straightened, and the scale mark should be close to the measured object;

3.Look correct: the line of sight is perpendicular to the scale and the object to be measured;

5.Correct: Measured value = accurate value + estimated value + unit.

Proper way to use the scale:

Release: The scale should be aligned with the part being measured.

Determine the starting point, the beginning of the measurement is aligned with the 0 tick mark, if the 0 tick mark is worn, it can be aligned with other whole grid ticks, and the measurement result should be subtracted from the previous value.

Determine the end point and read out the length corresponding to the end point.

When reading, the result should be estimated to the next digit of the graduation value; Record the measurement results and bring the units with you.

The special measurement methods of the scale are:

1) Accumulation method: Measure multiple identical tiny quantities together, and then divide the measurement result by the number of measurements to obtain the measured value.

2) Substitution method: Measure a quantity equal to the measured in place of the direct measurement of the measured.

3) Translation method: When the length of the object cannot be directly measured, such as the diameter of the ball, the height of the cone, etc., it is necessary to find a way to translate it to the outside of the object, and then measure it with a scale.

4) Rolling method: first measure the circumference of a wheel, let the wheel roll on the measured curve, record the number of rolling turns, and then multiply the wheel circumference by the number of turns to get the length of the curve path.

The correct way to use the scale is as follows:1.Choose the right one: choose the appropriate scale according to the measurement length and the minimum scale needs;

2.Put it correctly: the scale should be corrected, and the scale mark should be close to the measured object;

3.Look correctly: the line of sight is perpendicular to the scale and the object to be measured;

5.Correct: Measured value = accurate value + estimated value + unit.

The correct way to use the scale is as follows:1.Choose the right one: choose the appropriate scale according to the measurement length and the minimum scale needs;

2.Put it correctly: the scale should be corrected, and the scale mark should be close to the measured object;

3.Look correctly: the line of sight is perpendicular to the scale and the object to be measured;

5.Correct: Measured value = accurate value + estimated value + unit.

Straighten it and close to it. Next.

How to use:1Choose the right one: according to the measurement length and the minimum scale needs, choose the appropriate scale chain ruler;

2.Put it correctly: the scale should be straightened, and the scale mark should be close to the measured object;

3.Look correct: the line of sight is perpendicular to the scale and the object to be measured;

4.Read correctly: read the minimum scale value and above, but also filial piety to estimate the minimum scale value under the prudent one;

5.Correct: Measured value = accurate value + estimated value + unit.

1. Before use

Do three looks, that is, first see whether the zero scale of the scale is worn, if it has been worn, a scale value should be re-selected as the starting point of measurement.

Secondly, look at the measuring range (i.e., measuring range) of the scale. In principle, the length measurement requires a measurement, if the measurement range is less than the actual length, it is necessary to move the scale to measure several times, which will produce a large error.

Finally, look at the minimum scale value of the scale. The length value represented by the smallest scale not only reflects the different accuracy of the scale, but also relates to the validity of the measurement results. The range and minimum scale value should be selected based on the actual measurement requirements.

2. When using

Care should be taken for proper placement and proper observation when using it.

The key to correct placement is to do this: the ruler edge is aligned with the measured object, and it must be placed in a positive and overlapping manner, so as not to be skewed; The facets of the ruler must be close to the object being measured and cannot be "suspended".

The key to correct observation is to look at the line of sight in front of the main brigade of the terminal scale mark, the line of sight is perpendicular to the facet, and the number of large and small squares can be clearly seen.

3. Read the result

In general, it is estimated to read the next digit of the minimum tick value. If the minimum scale of the triangular ruler is mm, and the length of 2cm is measured with it, if it is exactly aligned on the scale line, the correct record should be, where is the number accurately read by the ruler surface, and since there is no estimated reading, it is necessary to add "0" to the 10th decile of the millimeter.

Note: The corresponding units must be written when recording the measurement results.

Errors

The reasons for the error come from the accuracy of the measuring instrument, the limitations of the experimental principle, and the objective factors of the environment and man. Therefore, errors in any measurement are inevitable.

We can only try to reduce the error, but it is impossible to eliminate it.

Errors are different from errors in that they are caused by improper methods and subjective factors (misreading, misremembering, etc.), so mistakes should be avoided and can be avoided in experiments.

Ways to reduce errors: select measuring instruments with high accuracy, improve experimental methods, and be proficient in experimental skills. In general experiments, the most effective way to reduce the error is to take the average of multiple measurements (this method is effective for reducing the accidental error).

Observations: 0 tick marks, ranges, graduation values.

Placement: The ulnar edge is aligned with the measured object, which must be placed in a positive and overlapping position, and cannot be skewed; The facets of the ruler must be close to the object being measured and cannot be "suspended".

Reading: The line of sight is directly in front of the terminal tick mark, and the line of sight is perpendicular to the facets.

Record: In general, it should be estimated to read the next digit of the minimum scale value, and the corresponding unit precautions must be written: master the conversion of various length units, the allowable error of the experiment, the selection of accurate instruments and multiple measurements and the reduction of manslaughter.