# lab5 - Physics 7B Lab 5 Intro to oscilloscope v.1.8 p 1...

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Physics 7B Lab 5, Intro to oscilloscope, v.1.8 p. 1 NAME: _____________________ SECTION DAY/TIME: _____________________________ GSI: ___________________________ LAB PARTNERS: ____________________________ Lab 5: Introduction to Oscilloscope and Time Dependent Circuits Introduction In this lab, you’ll learn the basics of how to use an oscilloscope. Then you’ll investigate time dependent circuits. When dealing with capacitors and inductors in DC circuits, it’s easy to get lost in mathematics, without understanding what’s going on conceptually. These questions and lab activities are designed to help you develop an understanding of these circuits, allowing you to address conceptual questions without plugging through unnecessary math. You’ll also see what these circuit components look like in real life. Part I of this experiment, on the basics of the oscilloscope, should take approximately 30 minutes. The rest of your time in lab should be spent working on Part II, on the time dependent RC and LR circuits. (Don’t worry if you aren’t fully comfortable with the scope by the end of Part I. You’ll get more practice in Part II.) Part I: Oscilloscope Basics Activity 1: Reset the oscilloscope Turn on the oscilloscope, and disconnect any probes plugged into the “channel 1” (CH 1) input connector. Set all the levers and buttons as indicated here, if they’re not already.

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Physics 7B Lab 5, Intro to oscilloscope, v.1.8 p. 2 Set the CH 1 coupling mode switch to “ground” (GND). Turn down the INTENSITY knob, if necessary, to avoid burning out the screen. The sweeping dot should be clear but not too bright. Since channel 1 is now “grounded” to zero volts, the oscilloscope should read zero on the vertical axis (using the coordinate axes centered on the screen). If it doesn’t. . . Adjust the channel 1 vertical POSITION knob so that the oscilloscope reads 0 volts. What the oscilloscope does The oscilloscope graphs voltage vs. time , by sweeping an electron beam across the phosphor screen. Wherever the beam hits the screen, it glows green. For most measurements, the beam sweeps rightward at a constant rate. As you can see, when the beam gets to the right-hand side of the screen, it jumps back to the left-hand side. In this way, the horizontal axis shows time. When a probe is plugged into the CH 1 input connector, the vertical axis shows the potential
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lab5 - Physics 7B Lab 5 Intro to oscilloscope v.1.8 p 1...

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