More insight into conducted immunity tests and investigation of support influences

The conducted immunity test is one of the major EMC tests performed in laboratories in the frequency range 150 kHz-80 MHz by the use of CDNs in accordance with IEC61000-4-6. In this paper, we investigated the conducted immunity test setup in more detail in terms of loop impedance values to gain more insight and also investigated influences of supports used under EUTs in tests for separation from the metallic plane. For this purpose, we compared various conducted immunity setups installed with a variety of insulation supports including a copper-wrapped one. We also sought a link between them based on the loop impedance values and the injected currents on the test loops. As a result, a further serious step was taken to discover the details of the conducted immunity test, which is based on the impedance measurement of test loops and on support influences.