5.4 Lab Assignment Analyzing Phase Lag & Frequency Response of RC Circuit

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Electric Circuits LAB EET113 Unit 5 Lab#10 Analyzing Phase Lag & Frequency Response By: Trevor Davis Date: 01/20/2023 Online EET Department ECPI University I pledge to support the Honor System of ECPI. I will refrain from any form of academic dishonesty or deception, such as cheating or plagiarism. I am aware that as a member of the academic community it is my responsibility to turn in all suspected violators of the honor code. I understand that any failure on my part to support the Honor System will be turned over to a Judicial Review Board for determination. I will report to a Judicial Review Board hearing if summoned. Name ...................... Date xx/xx/20xx 1

Mandatory Lab Conduct Figures All of your lab reports will require a “screenshot” figure containing the MultiSim circuit, the computers system tray, and the file information window. Your instructor needs to see the “Time Stamp” on this screenshot to make sure your work is original. An example of the screenshot is illustrated below with the required items circled in red. This figure with the required components is captured by: 1) Displaying the file information window=>Select “File”, then “File Information.” 2) For Windows based computers, press the Print Screen key on your keyboard and then paste the figure into your Word document 3) For Mac computers using XenDesktop, press at the same time “Command”, “Shift”, and “3” in order to take a screenshot or press “Command”, “Shift”, and “4” in order to generate cross-hairs with your pointer that can be used to select the area that you want to copy. In either case, the screenshot/desired image will be automatically saved to your computer desktop (Not the XenDesktop). You will need to insert the screenshot/desired image into your Word document You are required to place your first MultiSim screenshot figure in the section labeled, “ Place your screenshot with “Time Stamp” Here”. 2

Analyzing Phase Lag Frequency Response of a High-Pass Filter Abstract: (Student needs to write this). The abstract should not exceed four or five sentences. The abstract should be self contained and meaningful on its own with the intent that any reader can understand the primary purpose and findings of the lab at a very high summary level. Introduction : (Student needs to write this). In your own words, explain the reason for performing the experiment and give a concise summary of the theory involved, including any mathematical detail relevant to later discussion in the report. Part-1 Analyzing Phase Lag Method and Procedure:  Review the solution on Page 579, Example 13-5 in your textbook. .  Open the MultiSim software (On XenDesktop or on your laptop) and run the downloaded files E15-12A.ms8.  Measure the phase difference between Vin and Vout. Results and Figures : (Include your calculations, measurements, formulas & screenshots from Multisim if appropriate. Your instructor needs to see all your work) Place your screenshot with “Time Stamp” Here. a) Show your Multisim screenshot from the circuit and oscilloscope here. 3

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b) Measure the phase lag Measured “T” (Periode of Vs) = 314.39us Measured “T1” (Phase difference) = 64.39us Ø = [ 360 / T] x [ T1] = (360/314.39) (64.394) = 73.73degrees Part-2 Frequency Response of a High-Pass Filter. Method and Procedure 1. Review the information on High-Pass filters on pages 607-609 and figures 13-53 and 13-54. 2. Use MultiSim to CONSTRUCT your own “High Pass Filter” circuit (Like the one in Figure 13-53) . a. Voltage Source should be 10Vrms b. Capacitor value = 25pf c. Resistor value = 10Kohms 3. Calculate the Cutoff Frequency. 4

4. Test your circuit at multiple frequencies around the cutoff frequency and produce a frequency response curve similar to the one in figure 13-54. Results and Figures : (Include your calculations, measurements, formulas & screenshots from Multisim if appropriate. Your instructor needs to see all your work.) a) The cutoff frequency fc = 1 / (2πRC) fc = 1/2pi (10)(25) = 0.000637 kHz b) Place your Multisim screenshot (From the High pass filter circuit) here. 5

c) Fill in the following table. As you vary the source frequency, use a DMM to measure the Vout across the resistor. Keep in mind that DMM measures RMS value of an AC signal. Then, use the downloaded excel file to make the frequency response plot. Just copy and paste this table into the excel file. It will plot it automatically. Fill in the following table: Frequency (Hz) Vout (RMS ) Volts 2K 31.545mV 10K 159.101mV 20K 318.094mV 50K 793.122mV 100K 1.571V 200K 3.033V 6

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300K 4.308V 400K 5.369V 500K 6.226V 700K 7.441V 850K 8.041V 1M 8.467V 1.5M 9.223V 2M 9.54V 2.5M 9.698V 3M 9.787V 4M 9.878V 10M 9.98V 30M 9.99V d) Place your Frequency response curve from excel here. Conclusions: (Student needs to write this). In your own words, write a short paragraph for conclusions. It should not exceed three or four sentences Also answer this question: In a lag circuit, what happens to the phase lag if the frequency increases? Answer: As the frequency increases in a lag circuit, the voltage out will decrease. 7

References: (You may use this list or any other list if appropriate) 1. Text book: Electric Circuits, Edited by Ron Smith, 2nd Edition, Pearson Custom Publishing 2. Multisim Software Version 14.0 3. Citations from the web (If you have used any). 4. Instructor’s note 2017. 8