Method and apparatus for testing an immunity to electromagnetic interference and apparatus for irradiating radio wave for immunity test

An apparatus for measuring an electromagnetic wave stress of an article comprising:

• an electromagnetic wave irradiation unit comprising a plurality of radiation probes arranged adjacent to each other and along a surface of and spaced from said article at least on one side thereof so as to permit said probes to irradiate independently electromagnetic waves on divided local areas on a surface of said article and said divided local areas corresponding to locations of said probes;
• an oscillator means for generating electromagnetic wave signals to be used for excitations of said radiation probe;
• a transmitter means being electrically connected to both said oscillator means and said radiation probes for receiving said electromagnetic wave signals from said oscillator means and subsequently transmitting said electromagnetic wave signals to said radiation probes;
• and
• a control means being electrically connected to said article for receiving output signals having information as to existences of any abnormality in individual divided local areas in said article exposed to an electromagnetic wave irradiation, said control means being electrically connected to said transmitter means for controlling operations of said transmitter means to control independently an excitation of each of said plurality of radiation probes.