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Which supply does a Hall effect sensor require?

  • A.A reference voltage only, which is provided by the control unit and is returned as the signal from the sensor
  • B.A supply voltage and an earth as well as the signal wire
  • C.No supply, since the sensor generates its own signal from the movement of the trigger wheel past the pickup
  • D.An alternating supply

Answer: B

A Hall sensor is an active device with three wires: supply, earth and signal. A reluctor pickup is passive and generates its own signal, which is precisely the distinction between them and shows in the connector. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The order in which the effects act is what decides the outcome, so it is worth establishing first. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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