Title :
A comparison of the cryogenic current comparator and the Josephson potentiometer in resistance bridges using their figures of merit
Author_Institution :
Phys.-Tec. Bundesanstalt, Braunschweig, Germany
fDate :
4/1/1993 12:00:00 AM
Abstract :
The introduction of nearly error-free DC quantum standards of voltage and ohm is a challenge for precision metrology to improve the precision of measurements. Therefore, the principles and the performance of DC resistance bridges with the cryogenic current comparator and the Josephson potentiometer are discussed and their figures of merit are established, showing the present state of the art and the limitations given by the noise of the detectors and the quality of available resistance standards
Keywords :
Josephson effect; bridge instruments; electric resistance measurement; electron device noise; low-temperature techniques; measurement standards; potentiometers; Josephson potentiometer; cryogenic current comparator; figures of merit; nearly error-free DC quantum standards; noise; ohm; precision metrology; resistance bridges; resistance standards; voltage; Bridge circuits; Cryogenics; Current measurement; Electrical resistance measurement; Instruments; Measurement standards; Potentiometers; Resistors; Superconducting device noise; Voltage;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
