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124-01 The Oscilloscope

124-01 The Oscilloscope - PHYSICS 124 EXPERIMENT 1 PHYSICS...

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PHYSICS 124 EXPERIMENT 1 PHYSICS 124 EXPERIMENT NO. 1 THE OSCILLOSCOPE Introduction The oscilloscope is a very widely used laboratory instrument whose most usual application is to give a Visual display of time-varying voltages. While some oscilloscopes now use liquid-crystal displays (LCDs), most (including the ones you will use) still use a cathode-ray tube (CRT). Cathode-ray tubes were invented more than a century ago, but they are still the most important component of television sets, computer monitors and oscilloscopes. The CRT works as follows: Within an evacuated tube (see Fig. 1), a heated filament (much like the filament of an electric light-bulb) and a series of accelerating and focusing electrodes (this assembly is called an electron gun) serve as the source of a well- collimated beam of electrons, which impinge on the phosphorescent front surface (i.e., the screen) of the tube, causing a Visible spot to appear. Also within the CRT are pairs of metal plates which, when an electric field is established between one or the other pair, can deflect the electron beam horizontally or vertically, thereby moving the visible spot to any desired point on the screen. file:///C|/WINDOWS/Desktop/Lab%20Manual/124/HTML%20Version/124-01%20The%20Oscilloscope.htm (1 of 7) [8/15/01 10:17:57 AM]
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PHYSICS 124 EXPERIMENT 1 Procedure The first part of this week's experiment is to give you a working knowledge of how to actually use an oscilloscope. The following instructions apply to the Elanco 20 MHz Storage Oscilloscope, Model DS-203. With the oscilloscope directly in front of you, set the controls as follows: The white buttons below the display screen on the left should all be in the "out" position. The controls to the right of the screen should be adjusted as given below:
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