Microcomputer controlled electronic universal testing machine

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

Measurement range: The range between the minimum and maximum dimensions of materials or components that the testing machine can measure through the measurement system.

Indication error: The difference between the recorded or displayed deformation value of the specimen and the actual value of the measured value is called the indication error of the testing machine measurement system. Indicating error is inevitable, and its magnitude is within a specific range or standard specified range.

Sensitivity of deformation measurement in testing machine: The displacement rate of the sensitivity indicator relative to the measured change. Sensitivity is a sign of measuring physical instruments. The finer the sensitivity of the testing machine measurement system, the higher the accuracy of the measurement results.

Resolution of deformation measurement of testing machine: 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 are.

Working principle of deformation measurement:

A strain gauge extensometer is composed of an elastic element and a strain gauge attached to it. When the moving arm of the extensometer is subjected to force, it causes deformation of the elastic body and changes the resistance value of the strain gauge 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 reach the required value, This work is amplified and converted entirely by an A/D converter, then sent to a single-chip computer for processing, displayed in direct reading mode, and transmitted to the computer through RS232 for data processing.

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 testing machine. Choosing deformation measuring instruments with high reliability and strong stability is one of the factors worth considering for users.