A novel automatic bridge linking capacitance and resistance has been developed. This bridge with only one 10 nF capacitance and one 10 kΩ resistance standard, operating at 1592 Hz, is implemented based on digital compensation techniques. The standards are all defined as four terminal-pair impedances. All voltages applied to the bridge are generated by a multiphase direct-digital-synthesis sine wave source, a special channel of which provided accurate phase and constant amplitude when the phase is changed. In contrast with the conventional quadrature bridge, a lot of inductive dividers and a series of balancing processes are avoided. Preliminary experimental results indicate a relative uncertainty of four parts in 107 is obtained and could be improved further.
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