3D-susceptibility evaluation of actual housings of electronic equipment using rotating EM fields

The paper studies a method of evaluating the electromagnetic-shielding capability and three-dimensional susceptibility map for an actual electronic equipment housing. Although the shielding capability of an enclosure is conventionally evaluated using shielding effectiveness (SE), it is feared that the immunity/susceptibility weak points of the enclosure are overlooked. The susceptibility of an actual personal computer housing as an equipment under test (EUT) is measured using a rotating electromagnetic field. Experimental results show that the evaluation using susceptibility is more effective than the conventional SE. In addition, the test method is more effective in specifying the immunity/susceptibility weak points of the EUT visually and easily. Furthermore, it is shown that the condition of the incident EM field and the arrangement position of an EM-field sensor seriously affects the susceptibility of the actual housing.