Title :
A precise ccc bridge for QHR standard at NIM
Author :
Zhang Zhonghua ; He Qing
Author_Institution :
Nat. Inst. of Metrol., Beijing, China
Abstract :
A ccc bridge was completed in 2000 with uncertainties of several parts in 10/sup 9/ for comparison of QHR to 100 /spl Omega/ or 100 /spl Omega/ to 1 /spl Omega/. Then a bilateral comparison of 1 /spl Omega/ resistors with ETL of Japan was carried out and only a difference of 1.3 n/spl Omega/ was found.
Keywords :
bridge instruments; electric resistance measurement; measurement standards; measurement uncertainty; quantum Hall effect; resistors; 1 ohm; 100 ohm; China; ETL; Japan; NIM; QHR standard; bilateral comparison; precise ccc bridge; quantum Hall resistance; uncertainty analysis; Bridge circuits; Calibration; Design for manufacture; Helium; Instruments; Magnetic field measurement; Measurement uncertainty; Refrigeration; Resistors; Sampling methods;
Conference_Titel :
Precision Electromagnetic Measurements, 2002. Conference Digest 2002 Conference on
Conference_Location :
Ottawa, Ontario, Canada
Print_ISBN :
0-7803-7242-5
DOI :
10.1109/CPEM.2002.1034831
