• Calibration of the 3D Coil System's Orthogonality 

      Autor: Zikmund A.; Ripka P.
      (IEEE, 2013)
      Two methods were tested for calibration procedures of the 3D coil system which is used as a source part of the magnetic tracker. Precise magnetometer’s positions with respect to the coil system were used for determining ...
    • Calibration of unipolar high current impulses for resistance spot welding 

      Autor: Hlaváček J.; Kněnický M.; Draxler K.
      (Czechoslovakia Section IEEE, 2020)
      Requirement from practice is the need for quality and precise measurement of unipolar high current impulses, which are applied in resistance spot welding. The reason is the high dependence of weld quality on the shape and ...
    • Characterization of a precision modular sinewave generator 

      Autor: Kučera J.; Kováč J.; Palafox L.; Behr R.; Vojáčková L.
      (IOP Publishing, 2020)
      At the Czech Metrology Institute (CMI) we have developed a precision modular sinewave generator for impedance ratio bridges. The generator was developed to improve previously available designs regarding amplitude and phase ...
    • Estimation of Angular Deviations in Precise Magnetometers 

      Autor: Janošek M.; Saunderson E.F.; Dressler M.; Gouws D.J.
      (IEEE, 2019)
      Capabilities for calibrations of angular deviations of sensor triplets in precise magnetometers were evaluated in a 2.5-meter, triaxial Helmholtz-coil facility. The coil system is located in a magnetically quiet environment ...
    • Magnetic Calibration System With Interference Compensation 

      Autor: Janošek M.; Dressler M.; Petrucha V.; Chirtsov A.
      (IEEE, 2019)
      This paper describes a novel method for calibrating dc-precise magnetometers in the low field range (± 100 μT), which gives acceptable results even in laboratory conditions with significant magnetic interference. By ...
    • Measuring Repeatability of the Focus-variable Lenses 

      Autor: Řezníček J.
      (Czech Technical University in Prague, 2014)
      In the field of photogrammetry, the optical system, usually represented by the glass lens, is used for metric purposes. Therefore, the aberration characteristics of such a lens, inducing deviations from projective imaging, ...
    • A Reconfigurable Four Terminal-Pair Digitally Assisted and Fully Digital Impedance Ratio Bridge 

      Autor: Kučera J.; Kováč J.
      (IEEE, 2018)
      A reconfigurable digital bridge for calibrating four terminal-pair (4-TP) defined impedance standards in the whole complex impedance plane by means of fully digital (FD) operation of the bridge and for R-R, C-C calibration ...