Title :
A quantum Hall cryogenic current comparator resistance bridge
Author :
Jones, K. ; Early, M.D.
Author_Institution :
Ind. Res. Ltd., Meas. Stand. Lab. of New Zealand, Lower Hutt, New Zealand
Abstract :
A cryogenic current comparator (CCC) bridge for measuring quantum Hall resistance standards is described. The necessity for a full build-up calibration of the CCC is demonstrated and a model of the servo system for controlling the bridge is given.
Keywords :
Bridge circuits; Calibration; Current comparators; Electric current control; Electric resistance measurement; Measurement standards; Quantum Hall effect; Servomechanisms; I-V convertor; bridge control; computer controlled master current source; cryogenic current comparator bridge; four terminal resistor; full build-up calibration; linear DVM; quantum Hall resistance standards; servo system model; signal flow diagram; slaved secondary source approach; Bridge circuits; Coupling circuits; Cryogenics; Impedance; Optical buffering; Optical control; Resistors; SQUIDs; Servomechanisms; Voltage;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2000 Conference on
Conference_Location :
Sydney, NSW, Australia
Print_ISBN :
0-7803-5744-2
DOI :
10.1109/CPEM.2000.850892
