AC and DC Quantized Hall Array Resistance Standards
Randolph E. Elmquist, Mattias Kruskopf, Dinesh K. Patel, I Fan Hu, Chieh-I Liu, Albert F. Rigosi, Alireza R. Panna, Shamith U. Payagala, Dean G. Jarrett
Quantized Hall array resistance standards (QHARS) span values from 100 (ohm) to 1 M(ohm) and demonstrate precision approaching that of single devices. This paper focuses on QHARS having values near 1 k(ohm) for increased sensitivity using room-temperature direct current comparator (DCC) bridges and digital impedance bridges. We introduce a dc QHARS design that uses the Wheatstone bridge principle as a precise test of the QHARS self-consistency for dc measurements. Branched contacts and superconducting interconnections help to reduce ac and dc loading and leakage errors with near-zero resistance at magnetic flux densities of 9 T.
2020 Conference on Precision Electromagnetic Measurements(CPEM 2020)