Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1979-02-26
1980-06-10
Woodiel, Donald O.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
331 66, G01K 724
Patent
active
042066484
ABSTRACT:
An improved circuit for measuring resistance, as for the resistance of a temperature sensor, wherein the resistance varies over a wide dynamic range. The circuit provides two switch means to charge two capacitors through the unknown resistance. A time interval means measures charging time for one or both capacitors. Since charging time is directly proportional to resistance, a value of resistance is computed for one or both charging times. Control means, responsive to the time interval means, is provided to sequentially operate one or both switch means, the control means including means for selecting that charging time which is as long as possible yet within the range of the time interval means, thereby obtaining a higher resolution measurement in the range of sensor resistance where resolution would otherwise be inadequate.
REFERENCES:
patent: 3906391 (1975-09-01), Murdock
patent: 3911374 (1975-10-01), Busse et al.
Robbi Anthony D.
Tuska James W.
Jacobson Allan J.
Limberg Allen LeRoy
Rasmussen Paul J.
RCA Corporation
Woodiel Donald O.
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