1.1 本试验方法包括使用自动测试仪测量长丝和纺纱的纱线数量。一些仪器是独立的，另一些是执行额外测试的仪器的可选模块。 1.1.1 该仪器能够测量高达4000 dtex（3600旦）的纱线数。 注1: 关于使用卷轴和天平测定纱线数，请参阅测试方法 D1907 . 1.2 以国际单位制表示的数值应视为标准值。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 该纱线号测试方法适用于商业装运验收，并在贸易中使用。 5.1.1 如果在使用本测试方法进行商业装运验收测试时，由于报告测试结果的差异而产生争议，买方和供应商应使用仲裁测试方法 D1907 或进行比较测试，以确定其实验室之间是否存在统计偏差。建议为调查偏差提供称职的统计协助。作为最低要求，双方应尽可能均匀地从大量相关类型的材料中选取一组试样。 然后，应将试样以相同数量随机分配给每个实验室进行测试。在开始测试之前，应使用适当的统计分析和双方选择的概率水平对两个实验室的平均结果进行比较。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 本试验方法也用于长丝和纺纱的质量控制。

1.1 This test method covers the measurement of yarn number of filament and spun yarns using automated testers. Some of the instruments are stand-alone and others are optional modules for instruments that perform additional tests. 1.1.1 The instruments are capable of measuring yarn numbers up to 4000 dtex (3600 denier). Note 1: For determination of yarn number by use of reel and balance, refer to Test Method D1907 . 1.2 The values stated in SI units are to be regarded as standard. 1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 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 for yarn number is satisfactory for acceptance of commercial shipments and is used in the trade. 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 the supplier should either use the referee Test Method D1907 for yarn number or 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 homogeneous 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 results from the two laboratories should be compared using appropriate 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 This test method is also used for the quality control for both filament and spun yarns.