Many customers often face various misunderstandings when purchasing torsion testing machines. To help users make informed decisions, technical engineers have compiled and clarified several common issues related to torsion testing equipment.
Choosing the Right Range
The first step in selecting a torsion testing machine is determining the appropriate range based on the maximum load of the material being tested. It's recommended that the test load should ideally fall between 70% and 90% of the machine’s full scale. This ensures both accurate measurement and extends the service life of the device. Choosing a range that is too high or too low can lead to inaccurate results or unnecessary wear on the equipment.
Selecting the Appropriate Accuracy Level
Currently, most domestic testing machines are available in either Grade 1 or Grade 0.5 accuracy. For general material testing, a Grade 1 machine is usually sufficient. There's no need to invest extra money for higher precision unless you're conducting scientific research or detailed material analysis, where Grade 0.5 accuracy may be required. In reality, the technical difference between these two levels is not significant. The verification methods are largely similar, with the main difference lying in the number of correction points. With advancements in sensor technology, the linearity of sensors has reached very high standards. As long as the measurement circuit is free from defects and has good anti-interference capabilities, even a basic machine can achieve 0.5-level accuracy. For electrical measurements, the precision far exceeds the 0.5-level standard defined by national regulations.
Resolution and Dynamic Performance (Bandwidth) Selection
Resolution is a crucial parameter in testing machines. An appropriate resolution enhances the accuracy of measurements, especially for smaller values. However, there is a trade-off between resolution and dynamic performance (bandwidth). Increasing resolution may reduce the bandwidth, which can affect the ability to capture rapid changes in the material's behavior, such as yield fluctuations. If the bandwidth is too low, the yield point may appear as a flat line instead of a clear transition. Therefore, when choosing a machine, it's important to consider the balance between resolution and dynamic performance to ensure reliable and meaningful test results.
In summary, understanding the key factors—range, accuracy, and resolution—will help users select the right torsion testing machine for their specific needs, ensuring both efficiency and reliability in their testing processes.
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