Current Loop Signal Conditioning: Practical Applications
Anderson, Karl F. (1995) Current Loop Signal Conditioning: Practical Applications. Technical Report NASA TM-4636, Research Engineering, NASA Dryden Flight Research Center.
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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 detectors. 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.
| EPrint Type: | NASA Technical Memorandum |
|---|---|
| Keywords: | Bridge circuits, Circuit theory, Electrical engineering, Electronic circuits, Electronic test equipment, Electronics, Gages, Instrumentation, Measuring instruments, Remote sensors, Resistance temperature detectors, Resistors, Sensors, Strain gage instruments, Structural testing, Test facility instruments, Testing of materials, Transducers |
| Subjects: | (31 - 39) Engineering: (35) Instrumentation and Photography |
| ID Code: | 218 |
| Deposited On: | 16 July 2004 |
| Additional Information: | 22 pages. Presented at the 1995 Measurement Science Conference, Anaheim, California, January 26–27, 1995. |
