The article presents the program spectral line method of module error correction in linear input circuits. The method requires the knowledge of the frequency characteristics of the module errors and the phase errors of the input circuit to be corrected. The method was used for frequency error correction of measurement transformers applied in electronic power transducers. Such input circuits are nonlinear and distort the measured signals. The article presents the analysis of the influence of the nonlinearity of the input circuits upon the effectiveness of correction of frequency errors of the input circuit module at measurements of the root-mean-square value.

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The paper concerns the method of the correction of dynamic magnitude and phase errors of input stages, elaborated for linear input stages and tested for measurement current transformers. The method is implemented in the spectral domain in a programmed manner using the FFT algorithm. Correction of signal spectrum is based on frequency characteristics of magnitude and phase errors of input stages, which are determined on the basis of previous measurements. The method may be used for measuring RMS value and power of signals. It is possible to apply the correction method in the non-linear operation of the input stage, however, the correction efficiency may then be reduced. In order to improve the correction efficiency within the range of non-linear operation of the input stage, frequency errors of the a current transformer were identified with poly-harmonic signals. This paper presents the findings of the research of correction of frequency errors of a current transformer with poly-harmonic signals in measurements of the RMS current and power. The applied identification method brought improved efficiency of the correction within the range of non-linear operation of the current transformer.

In intelligent transportation, various types of sensors are used both in traffic control systems as well as in the control, safety, and entertainment systems of the vehicles themselves. In the process of educating future designers and developers of such systems, it is necessary to familiarize them with the operation and parameters of sensors. The recent years of the COVID-19 pandemic have disturbed this process due to the need to conduct classes remotely. This article presents the general concept of a laboratory stand for testing sensors of electrical and non-electrical quantities, which can be used both in stationary and remote learning. Additionally, the practical implementation of two laboratory stands for testing current and linear displacement sensors was also presented. Both stands have been tested in the remote access mode. The tests showed some shortcomings in the management software but also confirmed the correctness of the adopted concept of their implementation.