本技术规范被建立以考虑和定义在试验样品中展示的不连续类型，用于实际的非破坏性测试检查。根据EN 473:2000，第7.1.3.3条，测试样品中的不连续性可能是自然的，人造的或植入的。 声发射测试，红外热成像测试和泄漏测试不需要定义不连续型，因为它们的具体方法（例如在人造来源的AT中替换）

This Technical Specification is established to consider and define discontinuities-types to be exhibited in test specimens for use in practical Non Destructive Testing examinations. According to EN 473:2000, Clause 7.1.3.3, the discontinuities contains in the test specimens may be natural, artificial or implanted. Acoustic Emission Testing, Infrared Thermography Testing and Leak Testing need not define discontinuity-type, due to their specific approach (e.g. replaced in AT by artificial sources).