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Comparing the ramp and dual slope types on the same input containing mains hum, the ramp type

  • A.gives the same reading as the dual slope type
  • B.rejects the hum better
  • C.cannot make a reading at all until the hum has been filtered out
  • D.gives a reading that varies from one measurement to the next

Answer: D

The ramp type takes the input as it stands at the instant of comparison, so a superimposed hum shifts the crossing point and the reading wanders. The dual slope type averages over a whole hum period and reports a steady value.

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