IEC 61753-051-02:20 22包含插头插座式单模光纤固定光衰减器需要满足的最低初始测试和测量要求以及严重性，以便被归类为满足IEC 61753-1:20 18附录A中定义的C类受控环境的要求。第一版取消并取代了2013年发布的IEC 61753-051-3。本版构成技术修订版。本版本包括以下与IEC 61753相关的重大技术变更？051？3:2013: 根据IEC 61753-1，将类别由U改为C，测试项目及其条件； 更改反映调查结果的要求。

IEC 61753-051-02:2022 contains the minimum initial test and measurement requirements and severities which plug-receptacle style single-mode fibre fixed optical attenuators need to satisfy in order to be categorized as meeting the requirements of category C – Controlled environments, as defined in IEC 61753-1:2018, Annex A. This first edition cancels and replaces IEC 61753-051-3 published in 2013. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 61753？051？3:2013:

1. change the category from U to C and the test items and their conditions according to IEC 61753-1;
2. change the requirements reflecting the survey results.