High-precision, rapid readout of cryogenic temperature sensors in the Space Shuttle environment
Christopher Woodhouse · 2003
A compact and rugged system for performing 4-wire determination of the resistance of germanium resistance thermometers near 1 to 1 part in 65000 in 1 s using 20-nW excitation is described. Constraints unique to cryogenic and aerospace, systems are addressed. A microcomputer-controlled, hybrid analog/digital design is presented. Test results are presented, and future developments are discussed.>