The accuracy level of the material tensile machine directly determines the "accuracy, repeatability, and credibility" of the test results. The lower the level (the larger the value), the greater the error, and may even lead to misjudgment of qualified products. The core impact is concentrated on data deviation, standard compliance, and application effectiveness.
1、 Direct bias impact on core test data
Force related data: Key indicators such as tensile strength and yield strength may deviate with accuracy level. The first level machine has an error of ± 0.5% more than the 0.5 level machine, and the second level machine has an error of ± 1.5% more. For example, when tested for a tensile strength of 500MPa, the error of the 0.5 level machine is ≤± 2.5MPa, and the error of the 2 level machine can reach ± 10MPa, far exceeding the qualified threshold of some industries.
Deformation related data: The measurement deviation of elongation and cross-sectional shrinkage will increase with the accuracy level. The displacement and extensometer accuracy of low-level machines (level 2) are insufficient, which may lead to a measurement deviation of more than 5% in the elongation of flexible materials (such as plastics and rubber).
Data repeatability: Low precision models have poor repeatability, and the results of multiple tests on the same batch of samples fluctuate greatly, which cannot reflect the true mechanical properties of the material.
2、 The impact on standard compliance and testing effectiveness
High demand scenarios: Research, testing reports, and product certifications (such as ISO and GB standards) require a 0.5 level machine. Testing data from lower level machines may not be recognized, resulting in invalid testing results.
Conventional quality inspection scenario: Level 1 machines can meet most industry standards, while Level 2 machines may classify non-conforming products as qualified (missed judgment) or qualified products as non-conforming (misjudgment) due to excessive errors, increasing production or quality inspection risks.
Data traceability: The errors of low precision models are uncontrollable and cannot be compensated for through calibration, resulting in untraceable test data that does not meet quality system requirements (such as ISO 9001).
3、 Actual impact on different application scenarios
Research/New Material Development: Low precision can lead to misjudgment of material properties, such as mistaking low strength materials for high strength, which can affect the safety of subsequent product designs.
Industrial mass production: The first level machine can stably control product quality, while the fluctuation error of the second level machine may lead to a batch of unqualified products entering the market, or excessive removal of qualified products causing waste.
Third party testing: A level 0.5 or level 1 machine must be used, otherwise the testing report has no legal effect and cannot be used as a product qualification certificate or dispute arbitration basis.