Title :
Simulation of a quantum Hall cryogenic current comparator resistance bridge
Author :
Lawson, T.B. ; Early, M.D. ; Jones, K.
Author_Institution :
Meas. Stand. Lab. of New Zealand (MSL), Ind. Res. Ltd., Lower Hutt, New Zealand
Abstract :
A servo model of MSL´s CCC resistance bridge has been developed that predicts a number of resonance peaks in the response not obvious from a trivial analysis and may explain some observed instability. Such a model is useful for exploring subtle frequency-dependant effects and is valuable for optimising servo performance. Changes to some component values and operating procedures are predicted to limit the measured resistance ratio error to <;0.002 ppm.
Keywords :
SQUIDs; cryogenic electronics; current comparators; MSL CCC resistance bridge servo model; frequency-dependant effects; null SQUID response; quantum Hall cryogenic current comparator resistance bridge simulation; resistance ratio error; Bridge circuits; Circuit noise; Cryogenics; Electrical resistance measurement; Frequency; Resistors; SQUIDs; Servomechanisms; Voltage; Working environment noise;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM), 2010 Conference on
Conference_Location :
Daejeon
Print_ISBN :
978-1-4244-6795-2
DOI :
10.1109/CPEM.2010.5543400
