In the domestic market, the accuracy classes of electronic universal testing machines are generally three classes: 0.5, 1 and 2. These 3 accuracy classes also reflect the manufacturers of electronic universal testing machines to some extent .technical strength.
0.5Level precision Electronic universal testing machine is mainly used for laboratory teaching, research and development of new materials, product quality testing and other energy fields. In order to ensure the high precision and stability of the testing machine, manufacturers of electronic universal testing machines generally usemean imported parts for key components such as sensors, servo motors and ball screws, and the cost is higher than that of class 1 and class 2. So the electronic universal testing machine is relatively expensive in price. Most of them are microcomputer controlled models that can be connected directly to a computer printer to print out reports.
1Precision universal electronic testing machine is generally used for product testing that does not require high precision, such as B. Steel bars, plates, sensors, servo motors and ball screws for key components are mostly made of domestic parts, which have some price advantages over 0.5-level electronic universal testing machines. The electronic universal testing machine withAccuracy grade 1 has microcomputer-controlled LCD screen display, and also microcomputer-controlled type. The price of LCD screen display is cheaper than that of microcomputer-controlled model.
2Precision Electronic universal testing machines are mostly digital, equipped with a digital tube display. The numbers measuring function is relatively simple. It can only do stretching, compression, etc. It cannot display stress-strain curves, nor can it connect to a computer printer to print reports. It belongs to an outdated model, and the machine configuration is relatively low. AC motor and lead screw, poor accuracy.
Manufacturers of electronic universal testing machines generally have a CMC instrument measurement license, which states the accuracy, model of the testing machine , name etc. And the accuracy level of the testing machine must have professional quality supervision department to display instrument's testing power (relative error, relative repeatability error, forward and backward relative error, relative resolution, zero point relative error, etc.), coaxial accuracy, beam velocity, zero drift, extensometer, etc. can only post calibrated after thorough examination.
Regarding the assessment of the accuracy class of test machines, it can follow the national standard JJG 475-2008 Electronic Universityversal Testing Machine Verification Regulations as a guide.