Dual Josephson Impedance Bridge: Universal bridge for impedance metrology

This paper describes the results of the calibration of a 100 pF capacitance standard performed at 1233 Hz. Two calibration chains were used. The classical calibration chain, involving a quadrature bridge and a 1:10 ratio bridge, and the faster and simpler calibration chain based on the Dual Josephson Impedance Bridge (DJIB). The results of the two procedures are in agreement within the uncertainty of the DJIB $(\mathrm{u}(k=1)=57\ \text{nF}/\mathrm{F})$ , which is slightly smaller than the uncertainty of the classical calibration chain presently in operation at METAS.