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lab24 - LAB 24 THE CATHODE RAY OSCILLOSCOPE INTRODUCTION...

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LAB# 24 THE CATHODE RAY OSCILLOSCOPE INTRODUCTION : One of the most basic instruments for all modern science and technology is the cathode ray oscilloscope (C R O). The purpose of this experiment is to teach you how to use a CRO, and to use the instrument to look at a variety of signals. In particular, several different sources will be displayed and compared by means of the CRO. The heart of the CRO is simply an evacuated tube very similar to a television picture tube. A great application called OSCILLOSCOPE can be found on the LAB COMPUTERS -use this program as a tutorial about the CRO. The instrument we will use has two sets of deflecting plates, so that the beam of electrons can move either from side to side (x-deflection) or up and down (y-deflection). That's basically all there is to an oscilloscope. There is a special circuit (called the sweep) which automatically increases the voltage on the horizontal plates until the spot moves across the screen from left to right and then quickly switches back to zero voltage and repeats itself. You can "sweep" the beam across at fast (100,000 times/sec.) or slow (10 times/sec.) speeds so you can get a good picture of the vertical signal. In addition, there
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