Berberian-Cole Bridge

Figure 3.1.4. Modified Berberian-Cole bridge shown as a three-terminal interfacial-impedancemeasuring system, with potentiostatic control of the working electrode.

Figure 3.1.5. Schematic diagram of a working (modified) Berberian-Cole bridge shown as a four-terminal impedance-measuring system.

An active null admittance measuring instrument that incorporates many of the advantages of the transformer ratio arm technique, while obviating many of the disadvantage of passive bridges, has been reported by Berberian and Cole [1969]. Figure 3.1.4 shows a form of this bridge modified to measure impedance and to remove some of the limitations of the earlier instrument (McKubre [1976]). 

The principal advantages of the Cole-Berberian bridge are as follows ... 

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