Analysis of the Radiated Emissions of IT Equipment

Telecommunications and data communications devices are integral part of complex systems, which determine the correct functioning of economy. Efficiency and reliability of the functioning of electric and electronic devices decide about the functioning and development of national economy. In the article special attention is undesirable emissions. These emissions are by products generated unintentionally during realization of basic function of the device. They are formed in electric circuits containing inductances and capacities in which there occur sudden changes of current or voltage, relatively fluctuating changes of density of electric charge carriers or in which there occurs positive back coupling. In the article presented the disturbances of generated emissions by IT equipments, the methodology of measuring radiated emissions generated by IT devices in accordance with the EN 55022:2006 standard is presented and the results of measurements carried out on particular number of samples consisting of central processing units produced in the years 2007-2011 are demonstrated. The measurements of radiated emissions generated by IT equipments have been performed in the Electromagnetic Compatibility Laboratory at the Faculty of Electronics of the Military University of Technology in Poland.