A Common Circuit Topology for Measuring Quality Factor and Dissipation Factor

Abstract

ABSTRACTHay and Schering Bridges are employed for the measurement of quality factor and dissipation factor, respectively. After the bridge is balanced, the manual calculations involved in determining these factors are eliminated by employing a digital voltage-ratio metre. This allows the use of uncalibrated variable elements which are cheaper than the calibrated decade boxes. In this paper, we propose a common circuit topology for measuring both quality factor and dissipation factor in series or parallel forms. It requires only one condition to be satisfied instead of two (phase and magnitude conditions) in a conventional ac bridge. Unlike Schering Bridge, this arrangement requires only one standard capacitor which could be fixed. The test capacitor can take high voltages, while the standard capacitor remains in normal voltage range.