The article concerns the problems connected with electromagnetic compatibility. The methodology of shielding efficiency measurements of small chambers (e.g., casing of the personal computer (PC) and the 'racks') assigned for installing devices or electronic components in the frequency range from 80 MHz to 1000 MHz as well as the description of measuring position have been presented in it. The designed method of shielding efficiency measurement of small chambers comes down to making two measurements of the level of electromagnetic field strength for a particular probing frequency. The first measurement is performed as so-called reference measurement, whereas the second is principal measurement. The results of the research conducted in accordance with the designed measuring methodology concerning attenuation measurements contributed by the central processing unit casing from four sides of the object and their analysis from the perspective of using casing as a protection element against undesirable electromagnetic emission have been presented in the article.
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