A Proposed Capacitance Bridge Using a Modern Inductance Standard
Joseph M. Diamond · IEEE Transactions on Instrumentation and Measurement · 2006
A modern form of mutual inductor that comprises windings on a dust core toroid can be applied to the classic Carey Foster bridge to measure capacitance, avoiding the older forms of fixed or variable mutual inductance. When hermetically sealed, these closely coupled inductors offer stability in the 0.25% class