Lab 4 - Oscilloscopes and Time Dependent Circuits

# Lab 4 - Oscilloscopes and Time Dependent Circuits - Physics...

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Physics 8B Lab 4 – Oscilloscopes & Time Dependent Circuits rev 4.0 Lab 4 – Oscilloscopes & 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 8B Lab 4 – Oscilloscopes & Time Dependent Circuits rev 4.0 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 two wires are plugged into the CH 1 input connector, the vertical axis shows the potential difference—i.e., the voltage—between the two points the wires are connected to. If you’re interested, ask your GSI what’s going on inside the oscilloscope to deflect the electron beam up or down. Better yet, see if you can figure it out! Hint: Parallel-plate capacitor.
Physics 8B Lab 4 – Oscilloscopes & Time Dependent Circuits rev 4.0 Activity 2: Measuring DC voltages, and using the VOLTS/DIV setting

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## This note was uploaded on 09/28/2009 for the course PHYSICS 8B taught by Professor Shapiro during the Spring '07 term at Berkeley.

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Lab 4 - Oscilloscopes and Time Dependent Circuits - Physics...

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