Discussion
Match the transducer with its class.
1. Strain gauge 2. Photovoltaic cell 3. Capacitive displacement pickup
P. Active Q. Passive, resistive R. Passive, reactive
Answer: D
The strain gauge changes a resistance and needs a supply; the photovoltaic cell generates its own output; and the capacitive pickup changes a reactance and needs an alternating excitation. Each class implies a different signal conditioning circuit.
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