Industrial Automatic Control Systems and Controllers Annotation << Back Evaluation of the Effectiveness of Protection of Electronic Devices With Perforated Shields from Electromagnetic Interference Titov E.V., Kalashnikov A.A., Solovskoy A.S. The possibility of unauthorized access to information on a personal computer has been identified. The evaluation of the effectiveness of shielding electromagnetic fi elds in the frequency range of 1–20 kHz was carried out in experimental studies. The article presents the appearance of the emitter and receiver of the developed experimental installation. Expressions for determining the total energy losses of electric and magnetic fi elds in the near zone are given. The effectiveness of shielding steel sheets with the thickness of 1 mm has been evaluated in experimental studies. The article presents the comparison of the attenuation of perforated and solid-sheet shields. The results of the study showed that hexagonal perforation significantly worsens the shielding efficiency in the studied frequency spectrum. To increase the effectiveness of protecting personal computers from unauthorized access through interception of information when interacting with low-frequency components of the electromagnetic fi eld, we recommend determining the total energy losses of electric and magnetic fi elds in the entire frequency range formed by the protected equipment in several materials. The article presents graphical dependences of the total energy losses of the electromagnetic fi eld for the frequency of 20 kHz with the thickness of various metal screens of 4 mm. The conducted research has shown that the problem of electromagnetic protection of electronic devices by shielding low-frequency and high-frequency components of the electromagnetic fi eld is the diffi cult task that requires taking into account the technical characteristics of the protected equipment and the physical properties of electromagnetic fi elds on materials and segregated structures. Keywords: electromagnetic fi eld, electromagnetic influence, fi eld energy loss, solid-sheet shield, perforated plate, electromagnetic shielding, personal computer, electromagnetic wave attenuation. DOI: 10.25791/asu.6.2025.1592 Pp. 37-44.