Development of a Four-channel System for Johnson Noise Thermometry
Alessio Pollarolo, Jifeng Qu, Horst Rogalla, Paul Dresselhaus, Samuel Benz
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-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.
Conference on Precision Electromagnetic Measurements Conference Digest
June 13-18, 2010
Conference on Precision Electromagnetic Measurements
, Qu, J.
, Rogalla, H.
, Dresselhaus, P.
and Benz, S.
Development of a Four-channel System for Johnson Noise Thermometry, Conference on Precision Electromagnetic Measurements Conference Digest, Daejon, KR, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=904968
(Accessed December 2, 2023)