Deformation Measurement Summary: Deformation measurement of testing machine refers to the measurement system of material displacement and deformation by testing machine.

Deformation amplifier unit of deformation measurement system is one of the main components of the testing machine. Its main function is to amplify the weak signal produced by the sensor and send it to the computer after processing, so as to record or display the deformation value of the sample.

Nowadays, most of the deformation units use a single chip 24-bit ultra-low noise analog-to-digital converter, which integrates signal amplification and A/D conversion. Because the deformation unit has the characteristics of "single chip as the core, fewer peripheral circuits", the system has the characteristics of high precision, good stability, small linear error, strong anti-interference ability and so on. Reasonable design and good layout make the amplifier stable. The single chip computer unit connected with the amplifier, as the heart of the host computer, is responsible for the amplifier range conversion, data acquisition, data transmission, test mode selection and LCD display, digital quantization of direct reading, and can output these data through RS232 port, through RS232 port can also accept the fingers of other equipment. Order. Because of the single chip computer control, this unit has the function of automatic zero adjustment. When zero adjustment is made, the whole process of automatic zero clearing can be achieved by pressing the key of zero clearing in the main interface, and the time of zero clearing is very short.

Electronic universal testing machine

Deformation measurement technical parameters: deformation measurement index parameters have measurement range, indication error, sensitivity, resolution.

Measurement Range - The range between the minimum and maximum dimensions of a material or component that can be measured by a testing machine through a measuring system.

Indication error, the difference between the measured value and the recorded or displayed deformation value of the specimen, is called the indication error of the measuring system of the testing machine. Indication error is unavoidable, and its size is within a specific scope or standard.

Deformation measurement sensitivity of testing machine - the displacement rate of sensitivity indicator relative to the measured change, sensitivity is a symbol of measuring physical instruments, the more precise the measuring system sensitivity, the higher the measuring accuracy.

The resolution of the deformation measurement of the testing machine is the minimum measurement precision of the measuring data of the photoelectric encoder of the testing machine. The larger the resolution, the more accurate the measurement results.

The working principle of deformation measurement is:

Strain extensometer is made up of elastic element and strain gauge attached to it. When the moving arm of the extensometer is stressed, the elastic body is deformed and the resistance of strain gauge attached to it is changed. The original balanced bridge loses balance and outputs a voltage signal proportional to the deformation because of the output of the extensometer. The electrical signal is extremely weak and must be amplified before the desired value can be achieved. This work is amplified and converted by a complete 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.

Deformation measurement of testing machine is an important part of measuring and controlling system of testing machine, and is the key technical link of testing machine. It is worthwhile for users to choose the deformation measuring instrument with high reliability and strong stability.