IEC 61300-3-4:20 23 RLV包含官方IEC国际标准及其红线版本。Redline版本仅提供英文版本，为您提供了一种快速简单的方法来比较IEC官方标准与其以前版本之间的所有变化。 IEC 61300-3-4:20 22描述了可用于测量光学部件衰减的各种方法。然而，它不适用于IEC 61300-3-34和IEC 61300-3-45中描述的随机配对衰减测量，也不适用于IEC 61300-3-29中描述的密集波分复用(DWDM)器件的衰减测量。这第四版取消并取代了2012年出版的第三版。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)增加包含术语、定义和缩写术语的第3条； b)添加新的LSPM测量方法，插入方法(D)； c)增加了描述多芯光纤衰减测量的附录A； d）将功率计和4型DUT的参考测试方法更改为插入C，将替代测试方法更改为替换或插入D。

IEC 61300-3-4:2023 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition.

IEC 61300-3-4: 2022 describes the various methods available to measure the attenuation of optical components. It is not, however, applicable to random mate attenuation measurements as described in IEC 61300-3-34 and IEC 61300-3-45 nor for attenuation measurements of dense wavelength division multiplexing (DWDM) devices as described in IEC 61300-3-29. This fourth edition cancels and replaces the third edition published in 2012. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) addition of Clause 3 containing terms, definitions and abbreviated terms;
b) addition of a new LSPM measurement method, insertion method (D);
c) addition of Annex A describing attenuation measurement of multicore fibre;
d) changed reference test method to insertion C and alternative test method to substitution or insertion D for power meter and type 4 DUT.