Comparison between two-wire and three-wire models for shielded twisted-pair cables used in Johnson noise thermometry

Journal Article · Mon Feb 01 00:00:00 EST 1988 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1140244· OSTI ID:5657731

Roberts, M J

Using typical values of cable parameters and typical connections used in Johnson noise thermometry, a comparison was made between a two-wire and a three-wire transmission line model of a 30-m-long, shielded, twisted-pair cable over a range of frequencies from 0 to 300 kHz. For a 200-..cap omega.. source impedance and a 1-M..cap omega.. load impedance, the maximum difference between the voltage transfer functions calculated from the two models was 0.415%. For a 500-..cap omega.. source impedance, the maximum difference was 0.607%. For a 200-..cap omega.. source impedance and a 1-..cap omega.. load impedance, the maximum difference between the current transfer functions calculated from the two models was 4.24%. For a 500-..cap omega.. source impedance, the maximum difference was approximately 4.47%.

• Research Organization: Oak Ridge National Laboratory, P.O. Box X, Oak Ridge, Tennessee 37831-6008
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5657731
• Journal Information: Rev. Sci. Instrum.; (United States), Vol. 59:2
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
COAXIAL CABLES
DESIGN
PERFORMANCE
THERMOMETERS
MATHEMATICAL MODELS
TEMPERATURE MEASUREMENT
CABLES
CONDUCTOR DEVICES
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
EQUIPMENT
MEASURING INSTRUMENTS
420800* - Engineering- Electronic Circuits & Devices- (-1989)