Title :
High-precision capacitance bridge for dielectric-constant gas thermometry
Author :
Fellmuth, B. ; Bothe, H. ; Haft, N. ; Melcher, J.
Author_Institution :
Phys.-Tech. Bundesanstalt (PTB), Berlin, Germany
Abstract :
This paper describes a high-resolution and high-precision autotransformer ratio capacitance bridge that has been built and tested at PTB for dielectric-constant gas thermometry (DCGT). Its main component is a home-made high-precision 1:1 inductive voltage divider (IVD) used in a autotransformer configuration. Special emphasis is given to the estimation of the uncertainty of the determination of small capacitance changes considering correlations.
Keywords :
autotransformers; bridge circuits; permittivity; thermometers; voltage dividers; dielectric-constant gas thermometry; high-precision autotransformer ratio capacitance bridge; high-resolution autotransformer ratio capacitance bridge; home-made high-precision 1:1 inductive voltage divider; Bridge circuits; Capacitance measurement; Dielectric constant; Dielectric measurements; Equations; Helium; Kelvin; Magnetic cores; Temperature; Uncertainty;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM), 2010 Conference on
Conference_Location :
Daejeon
Print_ISBN :
978-1-4244-6795-2
DOI :
10.1109/CPEM.2010.5544248
