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Now let's understand how the CRT works with its basic functions. The following figure presents the basic construction details of a CRT An evacuated glass enclosure coated with phosphorescent screen for creating the required visible glow in response to the striking of the electron beam on its surface Horizontal and vertical deflecting plates for manipulating the angle of the electron beam.Ĥ. Focusing and accelerating components for creating accurate beam of electrons.ģ. An electron gun for generating the electron beam.Ģ. The CRT basically comprises of four parts:ġ. The CRT becomes responsible for generating the complex waveform imaging on the screen of the scope. Inside a cathode ray oscilloscope (CRO), the Cathode Ray Tube (CRT) becomes the main component of the device. CATHODE RAY TUBE - THEORY AND INTERNAL CONSTRUCTION For deflecting or processing the beam horizontally an operation called sweep-voltage is incorporated, while the vertical processing is done by the input voltage which is being measured. The feature of an oscilloscope to produce the actual image of the waveform becomes very helpful compared to digital multimeters which are only able to provide numerical values of the waveform.Īs we all know cathode ray oscilloscopes work with electron beams for indicating the various readings on the oscilloscope screen. These continuous traces then allows the user to examine the waveform and test its characteristics. The electron beam inside the CRT goes through deflected movements (sweeps) across the face of the tube (screen) in response to the input signals, creating a visual trace on the screen representing the waveform shape. It employs a cathode ray tube (CRT) for generating the visual display corresponding to the signal applied at the input as a waveform. The CRO is one of those high grade oscilloscopes which allows the user to see a visual representation of an applied waveform in question. In contrast an oscilloscope is a device which are designed for accepting and measuring waveform accurately enabling the user to visualize the shape of the pulse or the waveform practically.
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Hence these meters fail to serve the purpose when it comes to analyzing circuits involving waveform and timed cycles. Some advanced meters are able to measure ac signals but only if the signal is highly refined and in the form of specific undistorted sinusoidal signals. The commonly available meters such as digital multimeters or analogue multimeters have limited facilities and are able to measure dc or ac voltages, currents or impedances only. Therefore measuring these parameters accurately and correctly becomes very crucial while testing and troubleshooting these types of circuits
#Cathode ray oscilloscope tv#
These signals play an important part in such circuits in the form of audio information, computer data, TV signals, oscillators and timing generators (as applied in radars) etc. We know that majority of the electronic circuits strictly involve and work using electronic waveform or digital waveform, which are normally produced as a frequency. Importance of Cathode Ray Oscilloscopes (CRO)