Title :
The Approaches of Decreasing Measurement Uncertainty of CCC
Author :
Zhang, Zhonghua ; He, Qing ; Li, Zhengkun ; Liu, Yong
Author_Institution :
Nat. Inst. of Metrol., Beijing
Abstract :
The uncertainty source in measurement with CCC apparatus is discussed. Experiment shows that the uncertainty in operation of CCC is mainly from the pressure fluctuation of helium gas in cryostat. Some approaches of decreasing the uncertainty are proposed. In addition, increasing the turn number of the CCC windings can improve the S/N ratio in measurement and is also effective for decreasing the measurement uncertainty
Keywords :
cryostats; current comparators; measurement uncertainty; CCC apparatus; S/N ratio; cryogenic current comparator; cryostat; helium gas; measurement uncertainty; pressure fluctuation; Cooling; Fluctuations; Helium; Joining processes; Low pass filters; Measurement uncertainty; SQUIDs; Standards development; Superconducting device noise; Wires;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2004 Conference on
Conference_Location :
London
Print_ISBN :
0-7803-8494-6
Electronic_ISBN :
0-7803-8494-6
DOI :
10.1109/CPEM.2004.305611
