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Unformatted text preview: Lab 0: Orientation 1 Introduction: Oscilloscope Refer to Appendix E for photos of the appara- tus Oscilloscopes are used extensively in the laboratory courses Physics 2211 and Physics 2212. In these courses, each group consisting of two students will en- counter experiments 1-10 in a different prearranged sequence as assigned by the T.A. It is therefore useful to understand how to use an oscilloscope at the very outset. During this session, you will learn how to use an os- cilloscope to measure the properties of simple wave- forms, which are simply graphic representations of waves. You will also investigate the basic triggering modes of an oscilloscope. In lab 2 (The Oscilloscope- motion of free electrons in an electric field), you will be working with a stripped down version of an os- cilloscope. During this experiment you will have the opportunity to understand the principles of how it works. Oscilloscopes are widely used in research and indus- trial fields. Physicists use it to analyze data from elec- tronic circuits while biologists or medical researchers could use it to measure brain waves. Oscilloscopes are essential in many industrial fields such as the automo- bile industry, for instance to measure the vibrations in an engine, or in the electronics sector where it can be used by a technician to test or repair a circuit. The oscilloscopes used in these labs are generally ana- log oscilloscopes. Looking on the display screen, you can readily notice the grid markings on the screen, as shown in figure 1. These markings create a graticule, calibrated in centimeters (cm). The length between the horizontal or vertical lines is called a major divi- sion. The tick marks on the central horizontal and vertical graticule lines are called minor divisions. An oscilloscope basically consists of an electron gun enclosed in an evacuated tube. The end of the tube has a wide surface on which the signal is projected, and upon which the grid is superimposed. The elec- MT77MT97MT106MT111MT114 MT68MT105MT118MT105MT115MT111MT110 MT77MT105MT110MT111MT114 MT68MT105MT118MT105MT115MT111MT110 Figure 1: An oscilloscope’s grid tron beam’s behavior and path are controlled by two sets of capacitor plates found inside the tube, a verti- cal and a horizontal pair. The beam is deflected by a uniform electric field that is produced by applying a voltage between the plates. Visualize how the horizon- tal pair causes the beam to deflect horizontally, while the vertical plates cause the beam to be scanned in the vertical direction. The voltage on the horizontal plates determines the speed at which the beam sweeps across the tube and the input signal is applied to the vertical plates....
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This note was uploaded on 10/25/2010 for the course PHYS 2213 taught by Professor Hor. during the Spring '10 term at Maple Springs Baptist Bible College.
- Spring '10