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Unformatted text preview: Introduction to the Oscilloscope Christian Lawrence Neha Manikonda Pritesh Patel Yasmine Hill 3/4/10 Instructor: Sonal Singh Abstract The purpose of this experiment was to investigate and understand the relationships between the frequencies on the oscillating pattern of the sine graph in an oscilloscope. Time and voltage measurements are used in the oscilloscope to determine these patterns. Lissajous figures are formed to establish a final circle. This investigation was performed as a means of studying and understanding the basic principles of the cathode-ray tube of an oscilloscope. By changing the frequencies coming from the generator we were about to establish the experimental frequency from calculating the period, number of divisions, and time sweep per division. We completed three trials with the following frequencies, 90Hz, 300Hz, and 150Hz. The percent differences from those theoretical values and our experimental values are 6.84 %, 28.21 %, and 5.82 % respectively. Finally, we ended the investigation by varying the x and y-components of the oscilloscope. This gave us different figures that we could sketch to show how a Lissajous figure is interpreted. Introduction The cathode-ray tube (CRT), also known as the electron-beam tube, is the basic component of the oscilloscope. Electrons were thermally emitted from a cathode filament and then were accelerated through several thousand volts of potential differences. The electrons were then focused into a beam that strikes a screen and emits a visible light. Both horizontal and vertical deflection plates deflect the beam of electrons when a voltage is applied to them. The magnitude of the deflection of the beam spot from the center of the screen was proportional to the magnitude of the voltage applied to the deflection plates. In summary of the above description, the cathode-ray oscilloscope was an X-Y plotter capable of plotting at an extremely fast pace. fast pace....
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This note was uploaded on 04/06/2010 for the course PH 202 LAB LAB taught by Professor Lawson during the Spring '10 term at University of Alabama - Huntsville.
- Spring '10