IEC 61280-4-1:20 9+A1:2021适用于测量使用多模光纤的已安装光纤布线设备的衰减。该布线设备可以包括多模光纤、连接器、适配器、接头和其他无源设备。电缆可以安装在各种环境中，包括住宅、商业、工业和数据中心场所，以及工厂外部环境。本文档中使用的测试设备具有一个单光纤连接器接口或两个单光纤连接器接口。在本文件中，所述光纤包括子类别A1-OMx，其中x=2、3、4和5(50/125 μ m)和A1-OM1(62，5/125 μ m)多模光纤，如IEC 60793-2-10中所规定的。其他多模类别的衰减测量可以使用本文的方法进行，但是其他类别的源条件尚未定义。第三版取消并取代了2009年出版的第二版。本版构成技术修订版。与上一版相比，此版本包括以下重大技术变更: a)对附录F关于环绕通量的变更，以与IEC TR 62614-2保持一致，但保持表F.2至F.5中定义的环绕通量限值不变； b)在附录D中增加设备绳索方法； c)包括测试弯曲不敏感的多模光纤； d)测量不确定度的更新； e)附加布线配置的定义； f)对表5光谱要求的变更。 2020年4月勘误表的内容已纳入本副本。 关键词:衰减的测定；

IEC 61280-4-1:2019+A1:2021 is applicable to the measurement of attenuation of installed optical fibre cabling plant using multimode optical fibre. This cabling plant can include multimode optical fibres, connectors, adapters, splices, and other passive devices. The cabling can be installed in a variety of environments including residential, commercial, industrial, and data centre premises, as well as outside plant environments. The test equipment used in this document has one single fibre connector interface or two single fibre connector interfaces. In this document, the optical fibres that are addressed include sub-categories A1-OMx, where x = 2, 3, 4 and 5 (50/125 μm) and A1-OM1 (62,5/125 μm) multimode optical fibres, as specified in IEC 60793-2-10. The attenuation measurements of the other multimode categories can be made using the approaches of this document, but the source conditions for the other categories have not been defined. This third edition cancels and replaces the second edition, published in 2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) changes to Annex F on encircled flux to harmonise with IEC TR 62614-2, but keeping the encircled flux limits defined in Tables F.2 to F.5 unchanged;
b) addition of an equipment cord method in Annex D;
c) inclusion of testing bend insensitive multimode optical fibre;
d) updates to measurement uncertainty;
e) definition of additional cabling configurations;
f) changes to Table 5 on spectral requirements.
The contents of the corrigendum of April 2020 have been included in this copy.

Keywords: measurement of attenuation