ME530241_2009_Lab_04

# ME530241_2009_Lab_04 - ME 530.241 Electronics and...

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ME 530.241: Electronics and Instrumentation Lab 4: Impedence, RC Circuits, and All That Louis L. Whitcomb and Kyle B. Reed * Department of Mechanical Engineering The Johns Hopkins University Spring 2009 Apparatuses Multimeter, Tektronix PS280 DC Power Supply, Tektronix TDS3014B oscillo- scope, Tektronix CFG 253 function generator, leads, breadboard 1 Pre-Lab Exercises SHOW ALL YOUR WORK. No credit will be given unless your work is completely (and neatly) presented. 1. Exercise 4.51 of [1]. 2. Exercise 4.59 of [1]. 3. Exercise 4.54 of [1]. 4. Exercise 4.57 of [1]. 5. Consider the ﬁrst order low-pass ﬁlter circuit shown in Figure 1. (a) Draw the the circuit shown in Figure 1 (just the circuit, omit the probe leads). (b) Use phasor notation and impedance methods to analyze the circuit to determine the magnitude and phase of the output voltage V C ( t ) for an input voltage from the signal generator V S ( t ) = 1 . 0 cos( ωt ). i. Give an expression for the magnitude of the output as a function of frequency. ii. Give an expression for the phase of the output as a function of frequency. (c) Use your results from the previous question to: i. Compute the 3dB frequency in units of Hz - i.e. the frequency at which V C ( t ) = 1 2 V S ( t ). This will be f 3 dB for Question 4 in Section 2 of the lab. ii. Compute the magnitude of the output at the 3dB frequency. iii. Compute the phase of the output at the 3dB frequency. (d) Plot (using Matlab, Excel, or your favorite plotting method) the following data.

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ME530241_2009_Lab_04 - ME 530.241 Electronics and...

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