Conference Proceeding

Development of a four-channel system for Johnson Noise Thermometry

Nat. Inst. of Stand. & Technol., Boulder, CO, USA
07/2010; DOI:10.1109/CPEM.2010.5543592 pp.490 - 491 In proceeding of: Precision Electromagnetic Measurements (CPEM), 2010 Conference on
Source: IEEE Xplore

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.

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Keywords

analog
 
Boltzmann's constant
 
digital converter
 
four-channel JNT system
 
integration time
 
measurement bandwidth
 
re-determination
 
recharging power supply system
 
systematic error
 
water triple point
 

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