Title :
Optimum sensitivity of an externally shielded cryogenic current comparator
Author :
Early, M.D. ; Jones, K.
Author_Institution :
New Zealand Inst. for Ind. Res. & Dev., Lower Hutt, New Zealand
Abstract :
The sensitivity of an overlapped-tube cryogenic current comparator (CCC) has been calculated including the effect of an external shield. Dimensions of the shield, tube and pick-up coil can be optimised to give maximum sensitivity. Improvements in sensitivity by a factor of two or three are possible for a typical design.
Keywords :
cryogenic electronics; current comparators; electric current measurement; electric resistance measurement; equivalent circuits; measurement standards; quantum Hall effect; external shield; externally shielded cryogenic current comparator; inductance calculation; maximum sensitivity; model; optimum sensitivity; overlapped-tube CCC; pick-up coil; quantum Hall resistance bridge; Boring; Coupling circuits; Cryogenics; Equations; Equivalent circuits; Geometry; Inductance; Measurement standards; Superconducting coils; Wire;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 1996 Conference on
Conference_Location :
Braunschweig, Germany
Print_ISBN :
0-7803-3376-4
DOI :
10.1109/CPEM.1996.547107
