Question
Download Solution PDFWhat can a CRO measure?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF- CRO is a very versatile instrument in the laboratory for measurement of voltage, current, frequency and phase angle of any electrical quantity.
- 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 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.
Notes:
Common Lissajous pattern observed when two signals with different phase angle are applied to the two plates is as shown:
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