Practical applications of current loop signal conditioning

Karl F. Anderson

doi:10.1117/12.188823

4 October 1994 Practical applications of current loop signal conditioning

Karl F. Anderson

Proceedings Volume 2270, NASA/SPIE Conference on Spin-Off Technologies from NASA for Commercial Sensors and Scientific Applications; (1994) https://doi.org/10.1117/12.188823
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

This paper describes a variety of practical application circuits based on the current loop signal conditioning paradigm. Equations defining the circuit response are also provided. The constant current loop is a fundamental signal conditioning circuit concept that can be implemented in a variety of configurations for resistance-based transducers, such as strain gages and resistance temperature devices. The circuit features signal conditioning outputs which are unaffected by extremely large variations in lead wire resistance, direct current frequency response, and inherent linearity with respect to resistance change. Sensitivity of this circuit is double that of a Wheatstone bridge circuit. Electrical output is zero for resistance change equals zero. The same excitation and output sense wires can serve multiple transducers. More application arrangements are possible with constant current loop signal conditioning than with the Wheatstone bridge.

Citation Download Citation

Karl F. Anderson "Practical applications of current loop signal conditioning", Proc. SPIE 2270, NASA/SPIE Conference on Spin-Off Technologies from NASA for Commercial Sensors and Scientific Applications, (4 October 1994); https://doi.org/10.1117/12.188823

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