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A staircase ramp digital voltmeter differs from a linear ramp type in that its reference

  • A.falls continuously from a fixed positive value to zero
  • B.is a fixed voltage derived from a temperature-compensated reference diode
  • C.is the input voltage itself, delayed by a known interval
  • D.rises in equal discrete steps

Answer: D

A counter drives a digital to analogue converter whose output climbs one step at a time until it exceeds the input, and the count then standing is displayed. The reading depends on the accuracy of the converter rather than on the linearity of an analogue ramp.

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