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IEC61000-4-5:2014标准已经发布实施,其与老标准的差异主要有以下几个方面:
1、1.2/50μs的雷击波形发生变化,在校准时需要连接18μF的电容进行;
2、对电源线的CND,变更波形允许误差的电流参数,只能使用适合EUT的电流容量的波形的CDN;
3、非屏蔽对称/非对称信号线的CDN电路结构发生变化,对输出波形有新的要求;
4、10/700μs的雷击波形只针对长度超过300米的室外通信线缆;
5、10/700μs的CDN增加保护元器件,改变耦合阻抗;
原文变更摘录如下:
a) new Annex E on mathematical modelling of surge waveforms;
b) new Annex F on measurement uncertainty;
c) new Annex G on method of calibration of impulse measuring systems;
d) new Annex H on coupling/decoupling surges to lines rated above 200 A;
e) moreover while surge test for ports connected to outside telecommunication lines wasaddressed in 6.2 of the second edition (IEC 61000-4-5:2005), in this third edition(IEC 61000-4-5:–) the normative Annex A is fully dedicated to this topic. In particular it gives the specifications of the 10/700 μs combined wave generator.
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