Demonstrating the Versatility of a Josephson Impedance Bridge

We use the pulse-driven Josephson impedance bridge to perform quadrature measurements of two 10 nF capacitance standards and a 12.906 kΩ resistance standard at different frequencies between 300 Hz and 5 kHz. This leads to impedance ratios between 4:1 and 1:4. From these results indirect capacitance ratios were derived and compared with ratios directly at the same frequencies. This comparison agrees within Type A uncertainties for frequencies below 2 kHz. The largest deviation of 53 nΩ/Ω was found at the maximum frequency around 5 kHz. All measurements were carried out fully automated without the need to change the measurement setup, demonstrating the versatility of the pulse-driven Josephson impedance bridge.