DocumentCode
2275798
Title
Improvements in the NIST Johnson noise thermometry system
Author
Benz, S.P. ; Rogalla, H. ; White, D.R. ; Qu, Jifeng ; Dresselhaus, P.D. ; Tew, W.L. ; Nam, S.W.
Author_Institution
Nat. Inst. of Stand. & Technol., Boulder, CO, USA
fYear
2008
fDate
8-13 June 2008
Firstpage
36
Lastpage
37
Abstract
We have developed a Johnson noise thermometry system that is calibrated by precision waveforms synthesized with a quantized voltage noise source (QVNS). Significant improvements to the QVNS and the cross-correlation measurement electronics have dramatically reduced systematic errors and measurement uncertainty. We describe some of these improvements and discuss the potential for this system to contribute to the redefinition of the Boltzmann constant.
Keywords
constants; thermal noise; thermometers; Boltzmann constant; Johnson noise thermometry system; calibration; cross-correlation measurement electronics; precision waveforms; quantized voltage noise source; Electric variables measurement; Measurement standards; NIST; Noise measurement; Resistors; Superconducting transmission lines; Temperature measurement; Thermodynamics; Voltage; Wires;
fLanguage
English
Publisher
ieee
Conference_Titel
Precision Electromagnetic Measurements Digest, 2008. CPEM 2008. Conference on
Conference_Location
Broomfield, CO
Print_ISBN
978-1-4244-2399-6
Electronic_ISBN
978-1-4244-2400-9
Type
conf
DOI
10.1109/CPEM.2008.4574640
Filename
4574640
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