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The dual slope integrating digital voltmeter charges an integrator from the input for

  • A.a fixed time and then discharges it with a reference
  • B.a time proportional to the input and then discharges it for a fixed time
  • C.as long as it takes for the integrator to reach a fixed reference level
  • D.one cycle of the supply and then compares the result with a standard cell

Answer: A

The fixed charging time gives a ramp height proportional to the mean input; the reference then discharges it at a known rate and the time to reach zero is measured. Since the same capacitor and clock serve both phases, their values cancel out of the result.

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