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Consider the following statements with regard to Lissajous pattern on a CRO: 1. It is a stationary pattern on the CRO 2. It is used for precise measurement of frequency of a voltage signal 3. The ratio between frequencies of vertical and longitudinal voltage signals should be an integer to have a steady Lissajous pattern Which of the above statements is/are correct?

Consider the following statements with regard to Lissajous pattern on a CRO: 1. It is a stationary pattern on the CRO 2. It is used for precise measurement of frequency of a voltage signal 3. The ratio between frequencies of vertical and longitudinal voltage signals should be an integer to have a steady Lissajous pattern Which of the above statements is/are correct? Correct Answer 3 only

  • A Lissajous figure is a pattern which is displayed on the screen when sinusoidal signals are applied to both horizontal & vertical deflection plates of CRO.
  • These are used to measure the frequency of the given signals and the phase difference between the signals.
  • From the shape of the Lissajous pattern displayed on the CRO screen information about relative phases of signals and the frequency ratio of signals can be determined.
  • It is not used for precise measurement; it depends on the type of signals.
  • If one frequency is an integral multiple (harmonic) of the other, the pattern will be steady. If not, the figure will not be stationary.

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