Capacitance bridge null detector with a superconducting inductor
- 1 July 1978
- journal article
- Published by IOP Publishing in Journal of Physics E: Scientific Instruments
- Vol. 11 (7) , 635-638
- https://doi.org/10.1088/0022-3735/11/7/011
Abstract
A null detector for use with audiofrequency capacitance bridges is described. A superconducting inductor is used in a matching network at the input of the detector. Capacitive feedback in the preamplifier of the detector determines the bandwidth. For a bridge with an output capacitance of 1 nF operating at a frequency of 1592 Hz ( omega =104 rad s-1), the noise contribution from the detector is negligible compared with the noise contributed by the output conductance of the bridge (about 1.5 nS).Keywords
This publication has 3 references indexed in Scilit:
- Audiofrequency losses in a superconducting inductorJournal of Physics E: Scientific Instruments, 1976
- A Calculable Standard of CapacitanceMetrologia, 1965
- Phase selective a.c. bridge balance indicatorJournal of Scientific Instruments, 1963