How to look at a tape measure? What is the cause of the error in the tape measure?
Custom Tape Measure is a very common measurement tool in life. Many people know it and know how to use it. The main type of Look At Tape Measure is a Steel Tape Measure, followed by a fiber tape measure, a tape measure that people often see, and a waist ruler. There are also places in China that use a tape measure as a tape measure or a ruler. How do you look at a Method Of Using Tape Measure? What is the cause of the error in the tape measure?
How to Look At Tape Measure?
The first step is to prepare a tape measure. We notice that the switch button above the tape measure is closed.
The second step: open the switch, we are free to pull the tape, stretch, shrink automatically.
The third step: the scale of 0 taper close to one end of the object, and then we keep parallel to the object, pull the tape to the other end of the object, and close to this end, the most deduction closed the switch.
Step 4: The line of sight and the scale on the tape measure keep vertical and read the data. record it.
Step 5: Open the switch, retract the tape, close the switch, and put it back in place.
What is the cause of the error in the tape measure?
1, the error of temperature changes
Generally, the coefficient of thermal expansion of the tape measure is α = 1.25x10-5, and the temperature difference per metre per degree changes is only 80,000 times. However, the same tape measure will produce larger length change in the environment with larger temperature difference and affect the measurement result. . The error in temperature variation has been taken into account in the ruler length equation.
2, pull error
The size of the pull force will affect the length of the steel rule. If you do not measure the pull force with a spring during the measurement, an error will occur. The elastic modulus of steel E = 2X106KG/CM2, according to Hooke's law, a length of 30 meters will produce a ±1.8 mm length error when the ± 5 kg tensile force error
3, steel ruler is not horizontal error
When measuring the horizontal distance, the steel tape measure should be kept as horizontal as possible, otherwise it will produce the error of distance increase. For a foot length of 30 meters, an error of about 2.6 millimeters is generated when the height difference between the two ends of the ruler reaches 0.4 meters, and the relative error is 1/11,200.
After the use of maintenance, first, after the use of steel tape, it is necessary to wipe the dust on the ruler with a cloth to clean. Then use the unused engine oil to moisten. The amount of engine oil should not be too much. Wetting should prevail.
What is the cause of the error in the tape measure? The whole content, I hope everyone can read after the harvest. Tape measure is indispensable in our life. It can help us to test the length, width and height of objects used in all walks of life. Sometimes if there is no Method Of Using Tape Measure, many problems are solved.
