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A reconfigurable digital bridge for calibrations of four terminal-pair defined impedance standards in the whole complex impedance plane by means of fully digital (FD) operation of the bridge and for R-R and C-C calibrations by means of involvement of reference inductive voltage divider (IVD) in digitally assisted (DA) configuration have been built during last years. For the bridge purposes, a high...
This paper presents two methods for determining the ratio error and phase displacement of an instrument current transformer (ICT) with transformation ratio 20 kA/5 A. In the first case, the primary conductor passed by a current 20 kA placed in the centre of the toroid is replaced by a current loop with 10 turns placed in the centre of the toroid. In the second case, the conductor is replaced by 10...
This paper describes an automatized capacitance bridge (KRMS-C) developed for calibration of dielectric loss capacitors in the wide range from 10 nF up to 10 mF at frequencies from 50 Hz up to 10 kHz. The system is based on technique, where voltage drops across known and unknown impedance are measured and when measurement conditions are fulfilled, the value of the unknown impedance can be evaluated...
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