Transform Technology of Different-Terminal-Port Capacitor
Qi Wang · Journal of Tianjin University Science and Technology · 2006
Based on capacitance standard in the expanded frequency range from 100 kHz to 13 MHz being used as value transfer standard, a method is proposed to mark the frequency characteristic of single-terminal-port capacitor with four-terminal-pair (4TP) capacitor. Firstly, the factors that cause measurement error are analyzed based on the measurement principle of 4TP impedance. Secondly, with the aid of developed 4TP-single-termi-nal-port transform device, capacitance value of single-terminal-port capacitor is measured by 4TP impedance instrument. Finally, measured results are corrected by the nonlinear correction of impedance instrument based on radial-basis function( RBF) neural network and the error correction of measurement principle of 4TP impedance, the frequency characteristic of single-terminal-port capacitor is acquired. It's proved that the accuracy of marking results is improved by this method. Furthermore, this method achieves the unification of capacitance value and is the foundation for marking other different-terminal-port capacitor.