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Experiment Number 2 Oscilloscope Dr. Amr A. Abd-Elghany Medical Equipment Technology Department
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Objects of the experiment Connection of the generator with the oscilloscope. Differentiate between sine, square, and triangle waves. Determining the periodic time, frequency, and amplitude of unknown waves.
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Principles Cathode ray oscilloscope consists of: High evacuated tube: containing a gas at 0.01mmHg to accelerate the beam of electrons. Electron gun: a filament when heated emits a beam of electrons. Deflecting system: consists of: a. 2 horizontal plates y 1, y 2 producing vertical electric field. b. 2 vertical plates x 1, x 2 producing vertical electric field. Fluorescent screen: coated with zinc sulphide which produce light spot when the electron hit it where a part of the K.E. of the electron beam is converted to light energy.
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Emulsion of carbon: to remove the electron contamination.
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For the oscilloscope to draw the signals: Vertical plates x 1, x 2 are connected to the sweep circuit which produce saw tooth potential increases gradually then vanishes suddenly. Horizontal plates y 1, y 2 are connected to the unknown wave. To get stationary wave the frequency of the sweep circuit matches with the frequency of the unknown wave. Frequency F: is the number of complete cycles per second. Periodic time: is the time taken to complete one cycle of the wave.
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Procedure 1.Prepare the oscilloscope and connect it with the generator producing sine wave. 2.Measure the number of division in the X- direction. 3.Determine the time/div with sec then get the periodic time T= no. of div. in X-direction x T/D (sec). 4.The reciprocal of the periodic time in sec is the frequency in Hz. 5.Measure the number of division in the Y- direction. 6.Determine Vpp= no. of div. in Y direction x V/D (volt). 7.The amplitude A= V pp /2 volt.
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8. Repeat the above steps for the square and triangle waves. 9. Tabulate your results and draw the three types of waves. A=Vpp/2VppV/DNo. of div. Y- dir. Freq. (Hz.) T (sec)T/DNo. of div. X- dir. Type of wave Sine Triangle Square
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