The entire book refrains from deriving formulas. However, the theoretical foundations and the results of the mathematical treatment, based on the fundamental laws, are presented and explained in such a comprehensive manner that the practitioner can tackle the measurement tasks without resorting to other literature. For a more in-depth study of the theoretical connections, the bibliography is referenced. I would like to thank the author collective and the publisher for the pleasant collaboration. Special thanks go to Dr. W. Heink and Dr. H. Ernst, who significantly contributed to the success of the final editing of the manuscripts through their critical feedback and testing of the experiments with students in the electronics practical course at the Section of Physics at Karl Marx University Leipzig. Thanks also to the members of the Methodical Commission for Electronics, especially to Prof. Dr. Gerd.