Title :
A multifrequency quadrature bridge
Author_Institution :
Fac. of Electr. Eng., Czech Tech. Univ., Prague
Abstract :
A coaxial multifrequency quadrature bridge for linking capacitance and resistance standards has been realized. A precision ratio transformer having two cores and two secondary windings forms the fixed ratio arms of the bridge and two eight-decade two-stage inductive voltage dividers are used for the in-phase balancing. Most frequently, the bridge is used to calibrate 10 nF standard capacitors by comparing them with 12 906 Ω or 10000 Ω reference resistors. The calibration uncertainty (k=2) is less than 1 part in 105 in a frequency range from 400 Hz to 5 kHz. After being calibrated by means of the quadrature bridge, the 10 nF capacitors serve as reference standards for calibration of capacitors of lower values
Keywords :
bridge circuits; calibration; capacitance measurement; capacitors; electric resistance measurement; measurement standards; measurement uncertainty; resistors; voltage dividers; 10 nF; 10000 ohm; 12906 ohm; capacitance standards; coaxial multifrequency quadrature bridge; fixed ratio arms; in-phase balancing; inductive voltage dividers; low calibration uncertainty; precision ratio transformer; reference resistors; resistance standards; standard capacitors; Arm; Bridge circuits; Calibration; Capacitance; Capacitors; Coaxial components; Joining processes; Resistors; Transformer cores; Uncertainty;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2001. IMTC 2001. Proceedings of the 18th IEEE
Conference_Location :
Budapest
Print_ISBN :
0-7803-6646-8
DOI :
10.1109/IMTC.2001.928795
