Westinghouse Electric Corporation

David G Theriault

William W Wassel

Thomas J Kenny

James A Neuner

Douglas A Bauman

Kingsley F Graham

John R Smith

Timothy F Thompson

Dhulipala M Rao

Ronald R Havelka

William P Gaussa

John A Skoncey

A circuit device for simulating a selected one of a plurality of process transducers, including: signal input and output terminals connectable to external conductors; a plurality of circuit components (90,92,94; 104,108) connectable between the signal input and output terminals; a coupling device (106) connected between two of the circuit components for conducting a signal between the two components; and selective connecting members including connector terminals connected to at least one of the circuit components (90,92,94; 104,108), and connector elements for establishing conductive connections between selected ones of the connector terminals for configuring the circuit device to apply to the signal output terminal a signal corresponding to the output signal of a selected transducer.

Process sensor simulators

Numerous signal conditioning circuits on a plurality of printed circuit boards are calibrated remotely by a signal processing unit which sends coded signals to each board, either sequentially or in parallel, to connect either on-board or off-board test signals to one of the conditioning circuits in place of its field generated input. The processing unit utilizes the actual and expected responses of each conditioning circuit to low and high test signals to generate a gain and an offset which are applied to the conditioned field signal to provide a calibrated signal. The time constant for each conditioning circuit is also measured periodically, or upon a selected temperature change, for use in generating a minimum waiting period for obtaining valid data following transfers between the field generated signals and the test signals.

Method and apparatus for auto-calibration of signal conditioning

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Plum Borough, PA, United States of America

David G Theriault