Many customers often face misunderstandings when purchasing torsion testing machines. To help users make better decisions, technical engineers have compiled a list of common issues and considerations 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 be around 70% to 90% of the machine’s full scale. This ensures optimal measurement accuracy and helps extend the service life of the equipment. Choosing a range that is too large can lead to reduced sensitivity, while a range that is too small may cause overloading and damage to the machine.
Selecting the Appropriate Precision Level
Currently, most domestic testing machines are available in either Class 1 or Class 0.5 precision. For general material testing applications, a Class 1 machine is usually sufficient and offers good value for money. There’s no need to invest in higher-precision models unless you're conducting advanced scientific research or detailed material analysis, where Class 0.5 precision might be required. In reality, the difference between Class 0.5 and Class 1 machines is not always significant. The verification methods are similar, with the main distinction lying in calibration points. With advancements in sensor technology, the linearity of modern sensors has improved greatly. As long as the measurement circuit is free from defects and has strong anti-interference capabilities, most testing machines can achieve a precision level of 0.5. In fact, electrical measurements often exceed the 0.5-level standard defined by national regulations.
Resolution and Dynamic Performance (Bandwidth) Selection
Resolution is a crucial parameter in torsion testing machines. An appropriate resolution enhances measurement accuracy, especially for smaller loads. However, there's a trade-off between resolution and dynamic performance (bandwidth). Increasing resolution may reduce the machine's bandwidth, which affects how well it can capture rapid changes during testing. A lower bandwidth can result in less visible yield fluctuations or even a flat yield plateau, making it harder to analyze material behavior accurately. Therefore, when choosing a torsion testing machine, it's important to consider both resolution and dynamic performance to ensure reliable and meaningful test results.
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