What functions are typically included in signal conditioning for a sensor interface?

• A. Data logging and digitization.
• B. Power regulation only.
• C. Amplification, filtering, impedance matching.
• D. Temperature measurement only.

Answer: (C)

Signal conditioning prepares a sensor signal for a data acquisition system by shaping its amplitude, bandwidth, and impedance so the ADC can accurately sample it. The essential parts are amplification to bring small sensor voltages into the ADC's usable range, filtering to remove noise and limit extraneous frequencies, and impedance matching to prevent loading the sensor and to ensure maximum signal transfer. Data logging and digitization occur after conditioning, while power regulation keeps the electronics stable and separate from the signal path; temperature measurement, if needed, is a separate sensing task. Therefore, amplification, filtering, and impedance matching are the functions typically included in signal conditioning for a sensor interface.