IEC 60793-1-46:2024规定了监测衰减变化的统一要求，从而有助于检查商业用途的光纤和电缆。本文件给出了两种监测光纤和电缆衰减变化的方法，这些变化发生在机械或环境测试期间，或两者兼而有之。它提供了一个监测器，监测由光学不连续性、物理缺陷和衰减斜率修改引起的衰减特性的变化: -方法A:发射功率引起的衰减变化； -方法B:通过后向散射改变衰减。 方法A和B适用于监测以下各类纤维: -A类:多模光纤； -B类:单模光纤； -C类:单人- 模式内连接光纤。 两种测量的共同信息包含在第1条至第10条中，与每种单独方法有关的信息分别出现在附件A和附件B中。

IEC 60793-1-46:2024 establishes uniform requirements for the monitoring of changes in attenuation, thereby assisting in the inspection of fibres and cables for commercial purposes. This document gives two methods for monitoring the changes in attenuation of optical fibres and cables that occur during mechanical or environmental testing, or both. It provides a monitor in the change of attenuation characteristics arising from optical discontinuity, physical defects and modifications of the attenuation slope: - method A: change in attenuation by transmitted power; - method B: change in attenuation by backscattering. Methods A and B apply to the monitoring of all categories of the following fibres: - class A: multimode fibres; - class B: single-mode fibres; - class C: single-mode intraconnection fibres. Information common to both measurements is contained in Clause 1 to Clause 10, and information pertaining to each individual method appears in Annex A, and Annex B respectively.