Alternative conducted immunity testing with multiple CDNs and wire winding

Conducted immunity tests are always performed by use of Coupling Decoupling Networks (CDN) in laboratories in accordance with the standard EN61000-4-6. However, it is not always possible to use CDNs because of some limitations. If the Equipment Under Test (EUT) has large dimensions or high currents, it is not possible to use CDNs during tests. As a consequence, alternative methods are required in industry. In this paper, we firstly investigated the multi-CDN method which facilitates use of CDNs also for high-current EUTs by splitting mains current into several pieces that one CDN can handle. We also investigated simple wire-windings instead of cumbersome injection clamps to be applied to thick cables or cables in narrow places as an alternative to standard laboratory methods.