What are the methods for verifying the accuracy of the tension machine?

It is known from the material mechanics that under small deformation conditions, the strain ε at a certain point of an elastic element is proportional to the force received by the elastic element and also proportional to the elastic deformation. Taking the S-type sensor as an example, when the sensor is subjected to the pulling force P, since the strain gauge is attached to the surface of the elastic member, since the strain of the elastic member is proportional to the magnitude of the external force P, the strain gauge is connected to the measuring circuit. The magnitude of the force is measured by measuring its output voltage.
The tensile testing machine has a wide and accurate loading speed and measuring range. It has high precision and sensitivity for load, deformation and displacement measurement and control. It can also perform automatic control of constant velocity loading, constant velocity deformation and constant velocity displacement. Fog test, and has the function of low cycle load reciprocating, deformation cycle reciprocating, displacement cycle reciprocating.
In general, the output signal of the sensor is very weak, usually only a few mV, if we directly measure this signal, it is very difficult, and can not meet the high-precision measurement requirements. Therefore, the weak signal must be amplified by the amplifier, and the amplified signal voltage can reach 10V. The signal at this time is an analog signal, and the analog signal is converted into a digital signal by the multiplexer and the A/D conversion chip, and then the data is processed. At this point, the measurement of force came to an end. The device has two chucks connected to the photoelectric encoder mounted on the top of the measuring device through a series of transmission mechanisms. When the distance between the two chucks changes, the shaft of the photoelectric encoder is rotated, and the photoelectric encoder is driven. There will be a pulse signal output. Then, the signal is processed by the single-chip microcomputer, and the deformation amount of the sample can be obtained. The touch key operation mode makes the display of the display real-time convenient and convenient. It can realize the lifting and lowering of the beam when the sample is clamped, and has the functions of overload protection.
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