Working principle of deformation measurement of electronic universal test machine

Overview of deformation measurement:
Electronic universal testing machineDeformation measurement refers to a measurement system that measures material displacement and deformation through a test machine.
The deformation amplifier unit of the deformation measurement system is one of the main components of the test machine. Its main function is to amplify the weak signals generated by the sensor, process them and send them to a digital display table or computer, so as to record or display the deformation values ​​endured by the sample.
Most deformation units now use a single-chip 24-bit ultra-low noise analog-to-digital converter, which combines signal amplification and A/D conversion. Since this set of deformation units has the characteristics of "a single chip as the core and few peripheral circuits", this system has the characteristics of high accuracy, good stability, small linear error, and strong anti-interference ability. Reasonable design and good process layout make the amplifier extremely stable. Its monolithic computer unit connected to the amplifier, as the heart of the host, is responsible for the amplifier range conversion, data acquisition, data transmission, test method selection and liquid crystal display of the entire machine, and the digital quantization of direct reading. At the same time, these data can be output through the RS232 port, and instructions from other devices can also be accepted through the RS232 port. Due to the use of single-chip computer control, this unit has the function of automatically zeroing. When zeroing, you only need to press the clear key on the main interface to automatically clear the entire process, and the clearing time is extremely short.

Deformation measurement technical parameters:
The deformation measurement index parameters include measurement range, display error, sensitivity, and resolution.

Measurement range - The range between the small size and size of the material or component that the test machine can measure through the measurement system.
The display value error - the difference between the measured value recorded or displayed by the sample deformation value and the actual value of the measured value is called the display value error of the test machine measurement system. The display error is inevitable, and its size is within a specific range or a specified range by a standard.
Test machine deformation measurement sensitivity - the displacement rate of the sensitivity indicator relative to the measured change. Sensitivity is a mark for measuring physical instruments. The more detailed the sensitivity of the test machine measurement system, the higher the accuracy of the measurement result.
The resolution of the deformation measurement of the test machine refers to the measurable small accuracy of the measurement data of the test machine photoelectric encoder. The greater the resolution, the more accurate the measurement results.

Working principle of deformation measurement:
The strain extensometer is composed of elastic elements and strain gauge pasted on it. When the extensometer moves the arm, it causes the elastic body to deform and causes the resistance value of the strain gauge pasted on it to change. The original balanced bridge loses the balance and outputs a voltage signal output proportional to the deformation. Since the electrical signal output by the extensometer is extremely weak, it must be amplified before it can reach the required value. This work is completely amplified and converted by the A/D converter, and then sent to a monolithic computer for processing, and is displayed in a direct reading mode, and is transmitted to the computer through RS232 for data processing.
The deformation measurement of the test machine is an important part of the test machine measurement and control system and is a key technical link of the test machine. Selecting deformation measuring instruments with high reliability and strong stability is one of the factors that users should consider.http://www.hssdtest.com/