IEC 61300-3-53:2020 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 61300-3-53:2020定义了多模波导光源的环绕角通量测量，其中大多数横向模式被激发。术语“波导”应理解为包括通道波导和光纤，但不包括平板波导。适用的纤维类型如下: -IEC 60793-2-10中规定的A1； -IEC 60793-2-30中规定的A3； -IEC 60793-2-40中规定的A4。 这第二版取消并取代了2015年的第一版。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: -适用波导的范围，包括渐变折射率多模光波导和光纤； -5.3的结构已经重新排列； -增加了附件C和附件D。

IEC 61300-3-53:2020 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 61300-3-53:2020 defines the encircled angular flux measurement of multimode waveguide light sources, in which most of the transverse modes are excited. The term "waveguide" is understood to include both channel waveguides and optical fibres but not slab waveguides. The applicable fibre types are the followings:
- A1 specified in IEC 60793-2-10;
- A3 specified in IEC 60793-2-30;
- A4 specified in IEC 60793-2-40.
This second edition cancels and replaces the first edition in 2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- the scope of the applicable wave guides, and graded index multimode optical wave guide and fibre have been included;
- the structure of 5.3 has been rearranged;
- Annex C and Annex D have been added.