How is a Lissajous pattern created?

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 1
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  1. By drawing two square waves on different axis
  2. By drawing square wave and sine wave on the same axis
  3. By drawing two sine waves which are at right angles to each other
  4. By drawing two sine waves on the same axis

Answer (Detailed Solution Below)

Option 3 : By drawing two sine waves which are at right angles to each other
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  • Lissajous figure is the pattern, which is displayed on the screen of CRO, when sinusoidal signals are applied to both horizontal & vertical deflection plates of CRO.
  • These patterns are generated by the junction of a pair of sinusoidal waves with axes that are perpendicular to one another.
  • These patterns will vary based on the amplitudes, frequencies and phase differences of the sinusoidal signals, which are applied to both horizontal & vertical deflection plates of CRO.
  • Lissajous pattern is used for two types of measurement: frequency of the sinusoidal signal, phase difference between two sinusoidal signals
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