The theoretical part of this thesis focuses on understanding standardization, which is crucial for comprehending the thesis itself and the mission of institutions like SIQ. In this section, I have thoroughly examined the history of standard development and described three key standards: EN 55014-1, EN 55015, and EN 55016-2-3, which were used in the testing of radiated emissions of electronic devices. These standards provide guidelines and procedures to ensure the electromagnetic compatibility (EMC) of products, meaning that devices operate without causing electromagnetic interference.
The second part of the thesis focuses on testing radiated emissions in the frequency range from 30 MHz to 300 MHz. I compared three measurement methods: the Disturbance power method according to EN 55014-1, the CDNE method according to EN 50155, and the SAC method according to EN 55016-2-3. Each of these methods has its own advantages and disadvantages, which I have analyzed in detail. The measurements were conducted in special chambers lined with absorbers, using various measuring instruments to accurately determine the radiated emissions.
The results showed that the Disturbance power method works best at lower frequencies but is less reliable at higher frequencies. The CDNE method is more reliable at higher frequencies but requires a more complex setup. The SAC method demonstrated the best results in terms of accuracy and repeatability but is also the most demanding in terms of equipment and measurement conditions. All results are presented in the form of graphs and images, providing a clear overview of the frequencies where the strongest emissions occurred.
The conclusion summarizes the main findings of the thesis, describing the key results of the measurements of the three methods for evaluating the electromagnetic compatibility of products.
|
