Cryogenic Current Comparator Bridge Supplying Current up to 1 A and Current Dependence Measurement of 1 Ω Resistor

We developed a resistance ratio bridge using a cryogenic current comparator (CCC bridge), which supplied current of up to 1 A. We used it to measure the current dependence of 1 Ω resistors from 50 mA to 1 A by comparing them to a 100 Ω resistor with a small power coefficient. The typical value of the combined standard uncertainty of the measurements was estimated to be approximately 0.03 ppm.