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The accuracy of a dual slope digital voltmeter is independent of the values of its capacitor and clock frequency because

  • A.the capacitor is a precision type whose value cannot drift
  • B.both appear in the charge and the discharge phases alike
  • C.both are measured continuously by an auxiliary reference circuit
  • D.neither takes any part in the second phase of the conversion

Answer: B

The ratio of the discharge time to the charge time is the ratio of the input to the reference, and the capacitance and the clock rate cancel in forming that ratio. This is the great structural merit of the method and the reason it dominates bench instruments.

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