Theoretical and Practical Aspects Regarding Radiated Emission Testing in Semi-Anechoic Chambers


This paper presents some theoretical and practical aspects on measurements of radiated emission from a Portable computer. The used Standards are presented and discussed. The measurements were carried out in a Semi-Anechoic Chamber (SAC) in accordance with EN 55022 (CISPR 22) Standard. The test arrangement was in accordance with IEC 61000-4-3 Standard and the following equipment was included: reception antenna, signal generator and emission antenna. The measurements were made at a distance of 3 meters, according to the generic Standard IEC 61000-6-3. The radiated electromagnetic interference (EMI) was assessed in the frequency domain, for the frequency range of 30 MHz – 1 GHz, in compliance with CISPR 22 Standard. The test was performed to verify if the tested item (EUT) – in our case a Portable computer – is operating according to the radiated emission limits imposed by the product Standard of the class in which the equipment is framed: IEC 61000-6-1. Analyzing the values obtained for Quasi-peak during the test period, we noted that none of them exceeded the maximum allowed. The results were in satisfactory agreement with the limits imposed by CISPR 22 Standard, and have demonstrated that the equipment – in our case a Portable computer – works in optimal parameters, passing the radiated emission test. images