1.1 本测试方法包括使用电容测试仪对细纱中的故障进行分类和计数。 1.1.1 该方法不测定突出纤维或纱线毛羽或两者。 附注1: 要测量突出纤维或多毛或两者，请参阅指南 D5647 . 1.2 该测试方法规定了按故障等级和类型对纱线进行分级。 1.3 本试验方法适用于天然纤维或人造纤维或其混纺的所有单股或合股细纱。 1.4 以国际单位制单位表示的值将被视为标准值；英寸-磅单位的值仅供参考，并不完全等同。 1.5 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全和健康实践并确定法规限制的适用性。1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 5.1 根据买方和供应商之间的协议，该测试方法被认为是令人满意的，用于商业装运的细纱验收测试。 5.1.1 如果在使用本试验方法进行商业装运验收试验时，由于报告的试验结果不同而产生争议，买方和供应商应进行比较试验，以确定其实验室之间是否存在统计学偏差。对于偏倚的调查，建议有能力的统计协助。至少，双方应采取一组尽可能同质的测试样本，这些样本来自所讨论类型的大量材料。然后，应将相同数量的测试样本随机分配到每个实验室进行测试。在测试开始前，应使用统计分析和双方选择的概率水平来比较两个实验室的平均结果。如果发现偏差，必须找到并纠正其原因，或者买方和供应商必须同意在考虑已知偏差的情况下解释未来的测试结果。 5.2 纱线疵点是决定纱线和织物质量的一个因素。

1.1 This test method covers the classifying and counting of faults in spun yarns using capacitance testers. 1.1.1 Protruding fibers or yarn hairiness, or both, are not determined as part of this method. Note 1: For measuring protruding fibers or hairiness, or both, refer to Guide D5647 . 1.2 This test method provides for grading yarns by fault level and type. 1.3 This test method is applicable to all single or plied spun yarns from natural or manufactured fibers or blends of each. 1.4 The values stated in SI units are to be regarded as standard; the values in inch-pound units are provided as information only and are not exact equivalents. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method is considered satisfactory for acceptance testing of commercial shipments of spun yarns by agreement between purchaser and supplier. 5.1.1 In case of a dispute arising from differences in reported test results when using this test method for acceptance testing of commercial shipments, the purchaser and supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogenous as possible and that are from a lot of material of the type in question. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The average result from the two laboratories should be compared using statistical analysis and a probability level chosen by the two parties before the testing is begun. If a bias is found, either its cause must be found and corrected or the purchaser and the supplier must agree to interpret future test results with consideration to the known bias. 5.2 Yarn faults are a factor in determining yarn and fabric quality.