Several important factors that determine the performance and accuracy of electronic universal testing machines

3. Next is the force value sensor of the tensile tester. Because the quality of the sensor determines the accuracy and force stability of the tester. Currently, the small force value of the tensile machine sensors on the market generally use S-type sensors, and the large force value is generally use wheel sensors. The internal sensor is generally a resistive strain gauge type. If the accuracy of the strain gauge is not high or the anti-aging ability of the glue used to fix the strain gauge is not good or the material of the sensor is not good, it will affect the accuracy and service life of the sensor. The imported sensor used in open source instruments is the world-renowned sensor manufacturer, the United States Quanli Sensor. The sensor has high accuracy, good linearity, and very stable performance, and will not change for decades.

4. Again, the power source (motor) of the test machine is also called a motor. Currently, some microcomputer-controlled electronic universal test machines on the market use ordinary three-phase motors or variable frequency motors. This kind of motor uses analog signal control, slow control reaction, inaccurate positioning, and generally narrow speed regulation range. There is no low speed when there is high speed, or there is no high speed when there is low speed, and the speed control is inaccurate. The motor used in open source instruments is the Japan Panasonic full digital AC servo motor. The control method adopts full digital pulse control, with a wide speed regulation range, up to 0.001-1000MM/MIN, with accurate control positioning and fast reaction, and can be added to the full speed in 0.01 seconds. This motor can ensure accurate full-scale speed control, and has a long service life, which can reach decades without maintenance.

5. It is the measurement and control system of the test machine (that is, software and hardware). Currently, most universal tension machines on the market use 8-bit microcontroller control, with low sampling rate and poor anti-interference ability. In addition, it is the AD converter. If the number of bits of the AD converter is the low resolution. Then the measurement will not be accurate. The measurement and control system of open source instruments uses the world's advanced 32-bit ARM technology to develop controller Hytest V6.0. This controller is based on the 32-bit ARM platform and runs the time-based multi-tasking operating system developed by our company. The program runs smoother and the system is more stable. The sampling rate can reach 200 times per second. With the addition of a 24-bit high-precision low-sonic high-speed AD converter, the entire measurement and control system has a higher accuracy and high stability to control the entire test process. The software of the computer is the full-digital three-district control software developed by Xinzhenwei Instruments over 2 years. There are two control methods a. PID control and adjustment methods b. Mohu control and adjustment methods (the first in the industry). This allows the entire test process to achieve constant force value control, constant displacement control, constant deformation control, low-frequency fatigue control, and arbitrary program control. We have a team of strong technical strength and high-quality employees, with many experts,