Electronic system containing analog and digital circuits makes high-precision, four-wire measurements of resistance of each germanium resistance thermometer (GRT) in array of devices, using alternating current (ac) of 1 micro-A. At end measurement interval, contents of negative register subtracted from positive one, resulting in very-narrow-band synchronous demodulation of carrier wave and suppression of out-of-band noise. Microprocessor free to perform other duties after measurement complete. Useful in noisy terrestrial environments encountered in factories.
Analog/Digital System for Germanium Thermometer
NASA Tech Briefs ; 12 , 9
1988-10-01
Miscellaneous
No indication
English
Automotive engineering | 1978
|Digital thermometer, part 2 Final report
NTRS | 1969
|High-temperature digital fibre optic thermometer
British Library Conference Proceedings | 1994
|NTRS | 1987
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