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The rise time of an oscilloscope and its bandwidth are related approximately by the product

  • A.0.35
  • B.0.7
  • C.1.0
  • D.3.0

Answer: A

For a response approximating a single time constant, the rise time in seconds multiplied by the bandwidth in hertz is about 0.35. A hundred megahertz instrument therefore has a rise time of about 3.5 nanoseconds, which limits the edges it can resolve.

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