When an oscilloscope has a low bandwidth, which type of signals CANNOT be displayed correctly?

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ALP CBT 2 Electronic Mechanic Previous Paper: Held on 21 Jan 2019 Shift 1
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  1. Modulated wave
  2. Triangle wave
  3. Sinewave
  4. Square wave

Answer (Detailed Solution Below)

Option 4 : Square wave
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Detailed Solution

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If the bandwidth is too low following consequences arise:

  • An oscilloscope will not resolve the high-frequency changes.
  • Amplitude will be distorted,
  • Edges will vanish,
  • Details will be lost

 

Square wave:

  • A square wave with enormously fast rise and fall times, generating powerful harmonics.
  • In this instance, there is a significant bandwidth because of the large amount of power in the harmonics outside the fundamental frequency.
  • All digital signals can be represented with the pulses which are similar to a square wave. So, if bandwidth is low then this signal can’t be displayed correctly.

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