In a multiple trace oscilloscope, the display of two signals is achieved by:

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  1. using multiple phosphor screens
  2. using a digital display panel
  3. using two electron guns
  4. using a single electron gun with alternating sweeps

Answer (Detailed Solution Below)

Option 4 : using a single electron gun with alternating sweeps
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The correct answer is: 4) Using a single electron gun with alternating sweeps

Explanation:

In a multiple-trace oscilloscope, two or more signals are displayed simultaneously using:

  • A single electron gun that rapidly switches (alternates) between input channels.

  • Time-division multiplexing: The beam alternates between traces so quickly that the human eye perceives them as continuous.

  • Chopping/Alternate Mode:

    • Chopping: Fast switching (at ~100 kHz) draws small segments of each waveform alternately.

    • Alternate: Completes one full sweep of the first signal, then the next (used for slower signals).

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