This electronic device will be used to supply measuring circuits during calibration and inspection of measuring transducers of electro-energetic quantities, instruments, electronic protections and electricity meters. It will be very useful as a device to simulate the different ways of loading in electro-energetic network. The incorporated electronics will assure high stability of the set electric quantities, which is especially important for calibration and inspection of digital and etalon instruments.

In the paper a new and original FEM-3D approach to the analysis and design of 20 kV combined current- voltage instrument transformer is given. For the complex study of the electromagnetic field phenomena in the compound configuration with two non-linear magnetic cores of this instrument transformer the finite element method in the three-dimensional domain is used. The FEM-3D derived results will be applied for calculation of the magnetic field distribution in the 3D domain, as well as for the determination of the leakage reactances of the transformer winding. This enables metrologically improved design of the prototype of the transformer, through numerical calculation of the metrological error characteristics of the combined instrument transformer.

In the last years the increased interest about power quality, forced international working groups to define new standards for testing and measurement techniques applied to power systems. A particular attention has been paid to harmonic and interharmonic measurements for the well-known problems related to different power equipments. Considering the actual state of instrumentation technology, these standards assumes that only instruments using the Discrete Fourier Transform (DFT) are likely to be designed. Moreover, also if strictly speaking the concepts for distortion analysis can be applied only to steady state signals, draft and revision standards introduce a simplified procedure to evaluate general non stationary harmonic components and in particular interharmonics. These procedures are based on a hard limit for signal synchronous sampling and on different groupings and smoothings applied to the obtained spectrum. This allows assuring a complete and standardized interpretation of harmonic and interharmonic signal pollution. In this work, Authors present a software instrument developed in accordance with all in force, draft and under revision standards and international documents (IEC 61000 Part.3, Draft IEC 61000-4-30 Ed. 2000, Draft revision IEC 61000-4-7 Ed. 2000, Draft Guide IEEE P1159.1 ed. 2000, able to perform an on line voltage or current distortion analysis. The instrument has been tested and the result is that it can be used as a reference performance instrument, then where precise measurements are necessary, e.g. verifying compliance with standards, resolving disputes or for accurate emission measurements.

Extracting three-dimensional information from two-dimensional image coordinates acquired by video cameras is a essential problem in computer vision. Prerequisite is a camera calibration procedure. For the purpose of camera calibration both linear and iterative techniques have been developed. The iterative methods utilize non-linear camera models, i.e. non-linear search technique. Three different popular non-linear search techniques (Newton method, Gauss-Newton method, Levenberg-Marquardt method) were chosen and compared in order to find out which one gave the best results for the purpose of camera calibration and 3D reconstruction. Levenberg-Marquardt method has been proven to be superior which was in accordance to theoretical expectation of its features. It exercised robustness and convergent sets of camera model parameters in all experimental trials. Moreover, it justified intuitive expectation of improving reconstruction accuracy by augmenting linear camera model with additional non-linear lens distortion parameters.

Possibilities for quantifying the ferromagnetic particle contamination in human lungs with help of a rf SQUID system were studied. A tool for the analysis of the quantification of the measured data was developed. Conditions for the calculation of the particle concentration in human lungs from the measured remanent magnetic induction were established. The theoretical calculations were verified by measuring on physical lung models. The illustration of the method and a rough estimation of the concentration were carried out on an arc welder, with evidently contaminated lungs. The work also contains a discussion on problems associated with measuring the remanent magnetic induction in living organisms.