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TitleTerminal tightness: Improving the stability of a four-terminal standard resistor
Publication TypeConference Paper
Year of Publication2008
AuthorsChristian, L.A., and McLennan B.E.
Conference NameCPEM Digest (Conference on Precision Electromagnetic Measurements)
Date Published2008
KeywordsElectromagnetic measurements, Electromagnetism, Extreme case, Four-terminal resistance, Port terminals, Resistance to change, Resistors, Standards, Weight control
AbstractThe four-terminal resistance of commonly used Tinsley Type 5685A 100 Ω resistors can vary significantly depending upon how firmly the terminals are tightened. Our measurements show a resistance to change of 12 nΩ/Ω for one resistor to an extreme case of 8000 nΩ/Ω for another resistor for which the body of one current terminal could rotate relatively easily. These findings makes it necessary to exercise care when connecting and reconnecting these resistors and also necessary to develop a way of effectively detecting or better still preventing terminal body rotation. ©2008 IEEE.

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