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High precision, rapid readout of cryogenic temperature sensors in the Space Shuttle environment

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1 Author(s)
Woodhouse, C.E. ; NASA/Goddard Space Flight Center, Greenbelt, MD, USA

A compact and rugged system designed to perform four-wire determination of the resistance of germanium resistance thermometers (GRT) near 1 K to one part in 65000 in 1 s using 20-nW excitation is described. Constraints unique to cryogenic aerospace systems are addressed. A microcomputer-controlled, hybrid analog/digital design is presented. Test results are presented, and future developments are discussed

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Instrumentation and Measurement, IEEE Transactions on  (Volume:39 ,  Issue: 1 )