Electronic universal testing machine generally requires below 5KN is within 2mm.There are two ways to identify coaxiality: one is the hanging wire method (commonly used method), also known as the drop hammer.The two methods are as follows: clamp the upper end of the concentric rod, and clamp the lower end of a turntable. A magnetic dial indicator is placed on the chuck, and the probe is rotated around the concentric rod.Test machine larger than 5KN, using the method of attaching strain gauge, in the specified coaxiality tester, on the axis into 90 degrees each other around the four strain gauge, stretch, test their strain ratio then according to E(coaxiality)=(big change - average change)/ average change to calculate.Do not do the test for a long time, pay attention to turn off the main engine power.

If the machine is in standby mode, the transfer switch should be put in "load" mode, because if the transfer switch is in "fast return" mode, the solenoid directional valve will remain energized, which will affect the service life of the device.Most deformation units now use A single chip, A 24-bit ultra-low noise analog-digital converter, which amplifies signals and converts them into A/D.Due to the characteristics of "single chip as the core and few peripheral circuits", this system has the characteristics of high accuracy, good stability, small linear error and strong anti-interference ability.

Reasonable design and good process layout make the amplifier stable.The monolithic computer unit connected with the amplifier, as the heart of the host, is responsible for the amplifier range conversion, data acquisition, data transmission, test mode selection, liquid crystal display, direct reading digital quantization, and can output these data through RS232 port, which can also accept instructions from other devices.Strain type consists of elastic element extensometer and paste of strain gauge on it, when the moving arm stress extensometer, elastic body deformation and make the paste on it change electric resistance strain gauge, the original balanced bridge balance output A voltage signal output is proportional to deformation, owing to weak output signals the extensometer, must be enlarged to reach the required value, this work by entirely by A/D converter amplification and conversion, and then sent to the single chip computer for processing, display, in the form of direct reading electronic universal testing machine through RS232 transmitted to the computer, at the same time for data processing.Check the main engine and the oil source regularly to see if there is any oil leakage. If there is any oil leakage, replace the sealing ring or the combination pad in time.According to the usage of the machine and the service life of the oil, the oil absorption filter and filter element shall be replaced regularly, and the hydraulic oil shall be replaced.

This unit has the function of automatic zero setting due to the single chip computer control. When the unit is adjusted, it only needs to press the zero setting key on the main interface to complete the automatic zero setting. The time of zero setting is short.Force measurement should not exceed 0.05%.For example, 10KN testing machine: 100000*0.2*0.05%= 0.1n;It means that when you put a 0.1n weight on the electronic universal tester, the reading of the testing machine changes.That is, the small sensor load sensor units should be greater than or equal to 0.1 n.

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