Cryogenic current comparator designed for current dependence measurement of 1 /spl Omega/ resistor up to 1 A and for superconducting current measurement

摘要

We developed a cryogenic current comparator, to which currents of up to 1 A can be supplied. It was designed to be used for a resistance ratio bridge to measure current dependence of a 1 /spl Omega/ resistor from 50 mA to 1 A by comparing it to a 100 /spl Omega/ resistor with small power coefficiency. It was also designed to be inserted in a superconducting coil to measure superconducting current.