求教大神怎么理解IEC61000-4-4第7.3.2.2章节中“direct injection”
求教大神怎么理解IEC61000-4-4第7.3.2.2章节中“direct injection”，谢谢。If a suitable coupler/decoupler is not available, e.g. for a.c. mains currents >100 A, alternative methods can be employed, as follows:
in case of common and unsymmetric modes, direct injection using the (33 ± 6,6) nF capacitors is the preferred coupling mode;
if direct injection is not practical, the capacitive clamp is used.
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