Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Nonlinear
Patent
1994-08-08
1995-12-26
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Nonlinear
36457101, 36457107, 73708, G01R 1500, G06F 1130
Patent
active
054790964
ABSTRACT:
Disclosed is a digital correction system for application to an analog parameter measurement transducer. A temperature sensor, either separate from or incorporated into a parameter measurement transducer provides a temperature signal which is converted by an A-to-D converter to address temperature gain and offset corrections. These corrections are applied to a preamplifier amplifying the output of the transducer. The preamplifier output which has been temperature gain and offset corrected, is applied as an input to a final stage amplifier and also to a further A-to-D converter which addresses a storage device including transducer gain and offset corrections. The transducer gain and offset corrections are applied to the final stage amplifier so that the analog sensor output is corrected for temperature effects and for transducer nonlinearities. Various preferred embodiments can utilize two amplifiers or a single amplifier and can be driven by constant voltage or constant current power supplies for supplying power to the transducer.
REFERENCES:
patent: 4765188 (1988-04-01), Krechmery et al.
patent: 5048343 (1991-09-01), Oboodi et al.
patent: 5121118 (1992-06-01), Hermann
patent: 5135002 (1992-08-01), Kirchner et al.
patent: 5146788 (1992-09-01), Raynes
Boyarsky Oleg
Sidhu Karmjit
Szczyrbak Jackson
Karlsen Ernest F.
Kobert Russell M.
Lucas Industries Inc.
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