IEC 62614-1:20 20描述了用于测量无源元件和已安装电缆设备中的多模衰减的发射条件要求。在本文件中，所述光纤类型包括A1-OMx类别，其中x=2、3、4和5（50 μ m/125 μ m），以及A1-OM1（62、5 μ m/125 μ m）多模光纤，如IEC 60793-2-10中所规定的。详细描述的标称测试波长为850 nm和1 300 nm。本文档可以适用于其他多模类别和/或其他波长的多模衰减测量，但是这里没有定义其他类别和波长的源条件。这些要求的目的如下: 当使用不同类型的测试设备时，确保现场测量的一致性； 当使用不同类型的测试设备时，确保工厂测量的一致性；确保现场测量值与工厂测量值相比的一致性。 本文件描述了使用具有受控环绕通量（EF）的源进行光学衰减的发射条件要求。

IEC 62614-1: 2020 describes the launch condition requirements used for measuring multimode attenuation in passive components and in installed cable plants. In this document, the fibre types that are addressed include category A1-OMx, where x = 2, 3, 4 and 5 (50 μm/125 μm), and A1-OM1 (62,5 μm/125 μm) multimode fibres, as specified in IEC 60793-2-10. The nominal test wavelengths detailed are 850 nm and 1 300 nm. This document can be suitable for multimode attenuation measurements for other multimode categories and/or other wavelengths, but the source condition for other categories and wavelengths are not defined here. The purpose of these requirements is as follows:

• to ensure consistency of field measurements when different types of test equipment are used;
• to ensure consistency of factory measurements when different types of test equipment are used;
• to ensure consistency of field measurements when compared with factory measurements.

This document describes launch condition requirements for optical attenuation using sources with a controlled encircled flux (EF).