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A successive approximation digital voltmeter arrives at its reading by

  • A.counting clock pulses until a ramp crosses the input voltage
  • B.integrating the input for a fixed time and then discharging it
  • C.adjusting a potentiometer by a servo motor until balance is reached
  • D.testing each bit in turn from the most significant downward

Answer: D

The most significant bit is tried, kept if the trial voltage is still below the input and discarded otherwise, and so on down the word. An n-bit conversion therefore takes exactly n comparisons, which makes it both fast and of predictable duration.

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