1.1 本试验方法包括使用Port Ar和WIRA纤维细度计仪器估算羊毛纤维的平均纤维直径，该仪器基于气流原理。其他空气流量仪表未使用此方法进行测试。该方法直接适用于无髓、梳理羊毛和羊毛上衣。 1.2 本试验方法适用于在按照试验方法的指示制备此类材料的样品后制备润滑脂羊毛和擦洗羊毛 D2130 . 注1: 测试方法涵盖了使用马克隆仪器测量棉纤维细度 D1448号 . 羊毛和马海毛的等级分配见规范 D3991 和 D3992 . 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 本试验方法不推荐用于商业装运的毛条、梳棉条或擦洗羊毛的验收试验，因为仲裁方法、试验方法 D2130 为此，建议使用。虽然不建议将此测试方法用于验收测试，但它对于快速质量控制检查很有用。 5.1.1 如果两个实验室（或更多实验室）的报告测试结果之间存在实际意义上的差异，则应进行比较测试，以确定它们之间是否存在统计偏差，并使用主管的统计协助。作为最低要求，使用尽可能同质的样品进行比较试验，从与初始试验期间产生不同结果的样品相同批次的材料中提取，并随机等份分配给每个实验室。 应使用未配对数据的统计测试对相关实验室的测试结果进行比较，这是在测试系列之前选择的概率水平。如果发现偏差，必须找到并纠正其原因，或者考虑到已知偏差，必须调整该材料的未来测试结果。 5.2 羊毛纤维的比面积是通过气流中的阻力来测量的。气流阻力与微投影法测量的平均纤维直径有关。这些仪器已经过校准，可以读取以微米为单位的平均直径。尽管读数受试样平均纤维直径分布的影响，但仪器获得的结果没有显示这种分布。然而，在将微米读数转换为毫特单位时( 附件A1 )计算中使用了低、中、高标准差，得出了毫特单位的范围，从而反映了纤维直径的分布。

1.1 This test method covers the estimation of the average fiber diameter of wool fibers by use of the Port-Ar and the WIRA Fiber Fineness Meter instrument, which operate on the air-flow principle. Other air-flow instruments have not been tested with this method. The method is directly applicable to non-medullated, carded wool and wool top. 1.2 This test method is applicable to grease wool and scoured wool after the samples of such materials have been prepared as directed in Test Method D2130 . Note 1: The use of the Micronaire instrument for measuring the fineness of cotton fibers is covered in Test Method D1448 . The assignment of grade for wool and mohair is covered in Specifications D3991 and D3992 . 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 is not recommended for the acceptance testing of commercial shipments of wool top, card sliver, or scoured wool since the referee method, Test Method D2130 , is recommended for that purpose. Although this test method is not recommended for acceptance testing, it is useful for fast quality control checks. 5.1.1 If there are differences of practical significance between reported test results for two laboratories (or more), comparative test should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, use the samples for such a comparative test that are as homogenous as possible, drawn from the same lot of material as the samples that resulted in disparate results during initial testing and randomly assigned in equal numbers to each laboratory. The test results from the laboratories involved should be compared using a statistical test for unpaired data, a probability level chosen prior to the testing series. If bias is found, either its cause must be found and corrected, or future test results for that material must be adjusted in consideration of the known bias. 5.2 The specific area of the wool fibers is measured by the resistance in air flow. The resistance to air flow has been related to average fiber diameter measured by the microprojection method. The instruments have been calibrated to read average diameter in micrometres. Although the reading is affected by the average fiber diameter distribution of the specimen, the results secured by the instruments give no indication of this distribution. However, in converting the micrometres reading to millitex units ( Annex A1 ), low, medium, and high standard deviations were used in the calculations to arrive at the range of millitex units which accordingly reflect the distribution of fiber diameters.