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This publication contains the description of the prototype of wireless measurement card that share measurement data via global Internet network. The created measurement card aims to improving the process of obtaining measurement results by enabling remote measurement and sharing results via the Internet. At the beginning of the article, discussed issues are generally presented, which solution is presented device. In the next sections presented the main functional assumptions, describe the most important components included in the prototype and present the algorithm of the main loop of the device program.

The paper presents the results of a simulation research showing the problem of "spectrum leakage" in harmonic measurements. At the beginning, the paper discusses issues related to the need to analyze the power quality and the phenomenon of "spectrum leakage". Subsequently, for the test signals, measurement of harmonics in accordance with the applicable standard, was performed. During the simulation research, the frequency of the tested signal was changed in the range of acceptable deviations of the frequency of the voltage in the power grid determined by the appropriate standard. The harmonic measurement error was determined, with the known spectrum of test signals. Metrological interpretation of the obtained results, and formulations of conclusions were presented in the paper.