A current switch logic circuit is disclosed. This specimen preparation apparatus comprises a stained specimen preparation part for preparing a specimen on a slide glass and staining the specimen, a keeping part for storing the stained specimen slide glass prepared in the stained specimen preparation part and a control part for deciding whether to supply the stained specimen slide glass to the keeping part or to the external apparatus. The suitability of a predefined primary one of the curve approximation options for modeling is determined based on frequency-domain modal scattering parameters obtained according to frequency-dependent data characterizing the transmission line. A solid electrolyte capacitor is an electrical component of this type in which, for example, the electrode is connected as the anode and the electrically conductive coating is connected as the cathode.