新的！IEC 61000-4-12:20 17作为IEC 61000-4-12:20 17 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC？61000-4-12:20 17涉及电气和电子设备在运行条件下对公共和非公共网络提供的低压电源、控制和信号线路中出现的环形波的抗扰度要求和测试方法。 本文件的目的是为评估电气和电子设备在受到环形波时的抗扰度建立一个通用参考。IEC这一部分中记录的测试方法？61000描述了评估设备或系统对定义现象的抗扰度的一致方法。 根据IEC指南107，它具有基本EMC出版物的地位。与上一版相比，此版本包括以下重大技术变更: a)添加环形波形的数学建模； b)关于发电机选择和测试水平的新附件B； c)关于解释性说明的新附件C； d)关于测量不确定度的新附件D； e)添加高速CDN； (f)？增加了CDN的校准程序。

NEW!IEC 61000-4-12:2017 is available as IEC 61000-4-12:2017 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC？61000-4-12:2017 relates to the immunity requirements and test methods for electrical and electronic equipment, under operational conditions, to ring waves occurring in low-voltage power, control and signal lines supplied by public and non-public networks.
The object of this document is to establish a common reference for evaluating the immunity of electrical and electronic equipment when subjected to ring waves. The test method documented in this part of IEC？61000 describes a consistent method to assess the immunity of an equipment or system against a defined phenomenon.
It has the status of a basic EMC publication in accordance with IEC Guide 107.
This edition includes the following significant technical changes with respect to the previous edition:
a) addition of a mathematical modelling of ring wave waveform;
b) new Annex B on selection of generators and test levels;
c) new Annex C on explanatory notes;
d) new Annex D on measurement uncertainty;
e) addition of high speed CDN;
f)？addition of a calibration procedure for CDN.