Compensation of unavailable test frequencies during immunity measurements

Radiated immunity tests usually are performed in shielded test environments, such as anechoic chambers, GTEM-cells, and mode stirred chambers, for example. Then, if testing is performed in the frequency domain, the corresponding EMC-standards often specify test frequencies that have to be used. These requirements may become incompatible in case of large test objects, such as passenger aircraft, that cannot be placed in shielded test environments but only can be tested in open environments where, for regulatory reasons, not all required test frequencies can be applied. In this contribution it is investigated whether incomplete test procedures due to unavailable test frequencies can be compensated by alternative measurement setups.