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A new traceability chain for the derivation of the farad from dc quantum Halleffect has been implemented at INRIM. Main components of the chain are two newcoaxial transformer bridges: a resistance ratio bridge, and a quadraturebridge, both operating at 1541 Hz. The bridges are energized and controlledwith a polyphase direct-digital-synthesizer, which permits to achieve both mainand auxiliary equilibria in an automated way; the bridges and do not includeany variable inductive divider or variable impedance box. The relativeuncertainty in the realization of the farad, at the level of 1000 pF, isestimated to be 64E-9. A first verification of the realization is given by acomparison with the maintained national capacitance standard, where anagreement between measurements within their relative combined uncertainty of420E-9 is obtained.

Realization of the farad from the dc quantum Hall effect with digitally-assisted impedance bridges