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|Author(s):||Alessio Pollarolo; Chiharu Urano; Paul D. Dresselhaus; Jifeng Qu; Horst Rogalla; Samuel P. Benz;|
|Title:||Development of a Four-channel System for Johnson Noise Thermometry|
|Published:||December 30, 2010|
|Abstract:||Long integration time is necessary to reach low uncertainty when measuring temperature through Johnson Noise Thermometry (JNT). The main goal of the NIST JNT experiment is to achieve a 6×10-6 relative uncertainty in the measurement of the water triple point, which could contribute to the re-determination of Boltzmann's constant. A four-channel JNT system, which will reduce the measurement time two-fold, is being developed with new components, including a switchboard, an analog to digital converter (ADC) and a programmable, recharging power supply system. While implementing the new ADC, a source of systematic error was revealed, as well as a means to increase the measurement bandwidth.|
|Citation:||IEEE Transactions on Instrumentation and Measurement|
|Pages:||pp. 2655 - 2659|
|Keywords:||Boltzmann s equation, correlation, digital analog conversion, Josephson arrays, measurement units, noise measurement, quantization, signal synthesis, standards, temperature.|
|Research Areas:||Quantum Electrical Measurements, Johnson Noise Thermometry, Superconducting Electronics|
|PDF version:||Click here to retrieve PDF version of paper (393KB)|