In general, there are three sets of plates. Lissajous pattern is a pattern that results from applying periodic signals to the deflection plates of a CRO.įocussing is achieved by various sets of plated forming a sort of electronic lens. Sweep time is time duration during which the beam is swept from left to right on the screen of a CRT by the linearly increasing sawtooth voltage. Retrace time is the time required by the electron beam to return to its original position on a CRT screen after being deflected to the right by a sawtooth waveform. Graticule is a scale on transparent material that is fitted to the face of CRT for the purpose of measurement.Ĭoating of a conducting material, known as aquadag, is provided over the interior surface of CRT in order to accelerate the electron beam after passing between the deflation plates and to collect electrons produced by the secondary emission when electron beam strikes the screen. Cathode Ray Oscilloscope (CRO) Questions and Answers :: The deflection factor of a CRO is the reciprocal of the deflection sensitivity.Īstigmatism control is an adjustment that will provide sharp focus over the entire screen. What is meant by the deflection factor of a CRO? The deflection sensitivity of a CRO is defined as the vertical deflection of the beam on the screen per unit deflecting voltage.ĩ. What is meant by the deflection sensitivity of a CRO? The hole in a grid of a CRO is provided to allow passage for electrons through it and concentrate the beam of electrons along the axis of the tube.Ĩ. Why is the grid in a CRO provided with a hole in it? The sole function of an electron gun assembly in a CRO is to provide a narrow and sharply focused electron beam with is accelerated towards the phosphor screen.ħ. What electron gun assembly is provided in CRT? The essential components of a CRT are electron gun, focussing and accelerating anodes, horizontal and vertical deflection plates, and evacuated glass envelope with phosphorescent screen.Ħ. What are the essential components of a CRT? In a CRO, a triggering circuit is provided for synchronising two types of deflections so that horizontal deflection starts at the same point of the input vertical signal each time it sweeps.ĥ. For what a triggering circuit is provided in a CRO? Horizontal and vertical plates are provided between electron gun and screen to deflect the beam according to the input signal.Ĥ.
For Explain what vertical and horizontal plates are provide in a CRO? It is also from damping mechanisms and other inertia containing parts.ģ.
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The CRO gives very accurate measurements and is free from the errorsintroduced by the moving parts. How is CRO superior to ordinary measuring instruments?ĬRO is an electronic device that gives graphical representation of alternating quantities under examination. What is a cathode ray oscilloscope (CRO)?Ī CRO is an electronic device with a CRT as its main component and other associated circuits consisting of a power supply unit, a sawtooth-wave generator, horizon and vertical amplifiers.
Cathode Ray Oscilloscope (CRO) Questions :-ġ.