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Lissajous pattern obtained on CRO is used to determine

Lissajous pattern obtained on CRO is used to determine Correct Answer Phase shift and frequency

  • 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 phase difference between the signals.
  • From the shape of the Lissajous pattern displayed on 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.

 

Notes:

Common Lissajous pattern observed when two signals with different phase angle is applied to the two plates is as shown:

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Related Questions

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?
The Lissajous pattern obtained in a CRO depend upon which of the following properties of the two sine waves fed to it?
The above Lissajous pattern is observed in CRO, What is the phase difference between the applied signals?
Horizontal input to a scope is Em sin (ωt) V, vertical input to that scope is Em sin (ωt + 30°) V. What is the Lissajous pattern in that CRO?
Which of the following Lissajous patterns is obtained when frequency ratio between the two signals at x and y input of CRO is 1 and phase difference between them is 45°?
Select a figure from amongst the four alternatives, which when placed in the blank space of figure (X) would complete the pattern.
Completion of Incomplete Pattern mcq question image
Select a figure from amongst the four alternatives, which when placed in the blank space of figure (X) would complete the pattern.
Completion of Incomplete Pattern mcq question image
Select a figure from amongst the four alternatives, which when placed in the blank space of figure (X) would complete the pattern.
Completion of Incomplete Pattern mcq question image
Select a figure from amongst the four alternatives, which when placed in the blank space of figure (X) would complete the pattern.
Completion of Incomplete Pattern mcq question image
Select a figure from amongst the four alternatives, which when placed in the blank space of figure (X) would complete the pattern.
Completion of Incomplete Pattern mcq question image