The single-chip computer unit connected to the tensile testing machine and amplifier serves as the heart of the host, responsible for the amplifier range conversion, data acquisition, data transmission, test mode selection, and LCD display of the entire machine. It directly reads digital quantization and can output this data through the RS232 port, which can also receive instructions from other devices. Due to the use of a single-chip computer control, this unit has the function of automatic zeroing. When zeroing, simply press the reset button on the main interface to automatically reset the entire process, with a very short reset time.

Most deformation units of tensile testing machines use single-chip 24 bit ultra-low noise analog-to-digital converters, which integrate signal amplification and A/D conversion. Due to the characteristic of "single chip as the core and few peripheral circuits" of this deformation unit, this system has high accuracy, good stability, small linear error, and strong anti-interference ability. Reasonable design and good process layout make the amplifier very stable.

Tensile testing machine deformation measurement refers to a measurement system that measures material displacement and deformation through a testing machine. The deformation amplifier unit is one of the main components of the testing machine. Its main function is to amplify the weak signal generated by the sensor, process it, and send it to a digital display or computer, so as to record or display the deformation value borne by the sample. The deformation measurement of the testing machine is an important component of the testing machine measurement and control system, and is a key technical link of the tensile testing machine.

Working principle of deformation measurement of tensile testing machine
A strain gauge extensometer is composed of an elastic element and strain gauges attached to it. When the arm of the extensometer is subjected to force, it causes deformation of the elastic body and changes the resistance value of the strain gauges attached to it. The originally balanced bridge loses balance and outputs a voltage signal proportional to the deformation. Due to the extremely weak electrical signal output by the extensometer, it must be amplified to achieve the required value. This work is amplified and converted by an A/D converter, then sent to a single-chip computer for processing, displayed in a direct reading manner, and transmitted to the computer through RS232 for data processing.

Technical parameters for deformation measurement of tensile testing machine
1. The parameters of deformation measurement indicators include measurement range, indication error, sensitivity, and resolution.
2. Measurement range - the range between the minimum and maximum dimensions of materials or components that the testing machine can measure through the measurement system.
3. Indication error - the difference between the recorded or displayed measurement value of the sample deformation value and the actual value of the measured value is called the indication error of the testing machine measurement system. Indication error is inevitable, and its magnitude is within a specific range or standard specified range.
4. Measurement sensitivity - the displacement rate of the sensitivity indicator relative to the measured change. Sensitivity is a marker for measuring physical instruments, and the finer the sensitivity of the testing machine measurement system, the higher the accuracy of the measurement results.
5. The resolution of deformation measurement refers to the minimum measurable accuracy of the data measured by the photoelectric encoder of the testing machine. The higher the resolution, the more accurate the measurement results.