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The bandwidth of an oscilloscope is the frequency at which the displayed amplitude has fallen to

  • A.50 per cent of its low frequency value
  • B.90 per cent of its low frequency value
  • C.zero
  • D.70.7 per cent of its low frequency value

Answer: D

The convention is the three decibel point, where the amplitude ratio is one over root two. A sinusoid at the bandwidth frequency is therefore displayed about thirty per cent small, which is why amplitude measurements are made well below it.

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