Working principle of deformation measurement of electronic universal test machine (III)

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.