High-frequency electromagnetic field monitoring is extremely important for the environment. Recording and continuous observation of the levels of harmful factors and their evaluation should be examined by means of systematic and reliable measurements. The purpose of the present research stems from the need for verification and analysis whether modern phones are safe for users during telephone conversations. The analysis was carried out with the use of two ESM 120 and ESM 140 meters measuring the same devices simultaneously. The SAR (Specific Absorption Rate) describes the energy processes in the biological tissues exposed to electromagnetic fields (EMF). The maximum values recorded by the ESM 140 dosimeter are SAR = 0.5 mW/kg.

The paper presents the simplest methods for preventing the occurrence of low energy quality. The problem of the quality of electric current was also discussed, indicating its defects. A scheme for a power failure tree was developed using the FTA method. The obtained results were compared and discussed. Streszczenie. W pracy przedstawiono najprostsze metody zapobiegania występowaniu niskiej jakości energii. Omówiono również problem jakości prądu elektrycznego, wskazując na jego wady. Opracowano schemat drzewa awarii zasilania korzystając z metody FTA. Uzyskane wyniki zostały porównane i omówione. (Zastosowanie metody FTA do analizy jakości zasilacza bezprzerwowego UPS).

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Devices and installations used in radiocommunication or radio diffusion are currently the most numerous sources of electromagnetic fieldespecially in the high frequency range. The work presents the values of the intensity of the electromagnetic field which were measured using the ESM140 in several cities and towns.

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