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An incremental encoder provides

  • A.a voltage proportional to the speed of the shaft
  • B.the flux position within the machine directly
  • C.pulses whose count gives relative position
  • D.an absolute position reading valid at switch-on

Answer: C

Two channels in quadrature give direction as well as count, and a reference mark establishes a datum once per revolution. Because the count is relative, the axis must be homed after every power-up unless an absolute device is fitted.

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