Improvements in the NIST Johnson noise thermometry system

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...

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Bibliographic Details
Main Authors: Benz, S.P., Rogalla, H., White, D.R., Jifeng Qu, Dresselhaus, P.D., Tew, W.L., Nam, S.W.
Format: Conference Proceeding
Language:English
Subjects:
Electric variables measurement
Measurement standards
NIST
Noise measurement
Resistors
Superconducting transmission lines
Temperature measurement
Thermodynamics
Voltage
Wires
Online Access:Request full text
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Description
Summary: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.
ISSN:0589-1485
2160-0171
DOI:10.1109/CPEM.2008.4574640