Discussion
Signal conditioning between a sensor and its indicator typically provides
Answer: C
Correct answer: Excitation and amplification
Most sensors are passive and produce a very small signal, so the conditioner must both supply the excitation the device needs and amplify what comes back - millivolts from a bridge or a thermocouple.
It usually does more besides: filtering, linearisation, cold junction compensation for thermocouples, and conversion to a standard output. Isolation is often provided but is not the whole of the function, and the conditioner does not power the indicator or support the sensor mechanically.
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