What signal conditioning is required for RTD inputs?

RTD signal conditioning requirements: excitation current (constant current source, typically 1 mA, to measure resistance change), lead wire compensation (3-wire or 4-wire configurations to eliminate lead resistance error), amplification (convert resistance to voltage/current output), linearization (RTD has slight non-linearity requiring correction), and filtering (remove noise). 4-wire RTD eliminates lead resistance completely; 3-wire assumes equal lead resistances; 2-wire includes lead resistance in measurement (acceptable only for short leads).