光纤通信子系统试验程序.第4-1部分:已安装的布线设备.多模衰减测量

[中文适用范围]： 本部分IEC 61280适用于使用多模光纤测量已安装光缆设施的衰减。该光缆设施可包括多模光纤、连接器、适配器、接头和其他无源器件。光缆可安装在多种环境中，包括住宅、商业、工业和数据中心场所，以及外部设施环境。本文档中使用的测试设备具有一个单纤连接器接口或两个单纤连接器接口。 本文档中涉及的光纤包括子类别A1-OMX（x=2,3,4,5，50/125 μm）和A1-OM1（62.5/125 μm）多模光纤，如IEC 60793-2-10中规定。其他多模类别的衰减测量可使用本文档的方法进行，但其他类别的光源条件尚未定义。 [外文原描述]： IEC 61280-4-1: 2019 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. Keywords: measurement of attenuation The contents of the corrigendum of April 2020 and December 2022 have been included in this copy.