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The chief weakness of the ramp type digital voltmeter is that

  • A.it takes far longer to make a reading than any other type
  • B.it requires a standard cell to be maintained within the instrument
  • C.its accuracy depends on the linearity of the ramp
  • D.it cannot measure a voltage of negative polarity at all

Answer: C

Any curvature or drift in the ramp generator appears directly as an error in the reading, and the clock frequency must be equally stable. The dual slope method removes both dependencies at once, which is why it displaced the plain ramp.

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