ELEC201 Lab 1

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Excelsior University *

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201

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Electrical Engineering

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Feb 20, 2024

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Module 1 Lab – MultiSim Refresher Thomas Wahl Electrical Engineering Technology, Excelsior University ELEC201: Digital Electronics Dr. Alan Dixon January 14, 2024

Module 1 Laboratory Introduction: The purpose of this laboratory is to refresh users on the multiple aspects and components of MultiSim, as well as to manually confirm the results of said components versus manual calculations. Part 1. Using the XMM to measure DC voltage and current, and resistance: Build the circuit given below to measure the DC voltages across the three resistors. Run the simulation and display the faces of the three XMMs. Are the meters showing the correct voltages? Use Ohm's law to calculate these. Take a screenshot of the circuit displaying three voltages for your report. Show the calculated and measured values using a small table. Yes, the XMM is properly reading the voltages across the resistors of the circuit, confirmed through the above hand calculations. Next, build the parallel resistance circuit shown below. Add three multimeters for measuring the current through each of the three resistors. Run the simulation and display the faces of the three XMMs. Are the meters showing the correct current values? Use Ohm's law to calculate these. Take a screenshot of the circuit displaying three current values to add to your report. Show the calculated and measured values using a small table.

Yes, the XMMs are correctly reading the current values through all three resistors. Finally, you will measure the total parallel resistance using the digital multimeter. Remember that you cannot measure the resistance of a live circuit. So, you will need to disconnect the voltage source. Use the circuit given below to do it.

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Yes, the XMM is correctly reading the total resistance of the circuit, as shown in the calculations of the previous parallel set up. Part 2. Using the Oscilloscope to display sine waves of different frequencies: You will use the function generator as a source of sine waves. Connect the +ve sine wave to the input of the oscilloscope as shown in the diagram below. Set the frequency to 5kHz and amplitude to 5V. Adjust the time base and vertical gain on the scope to get a good display having two or three cycles of sine waves in view.

Hz=1s/200us=5kHz Amplitude = 5 Hz=1s/100us=10kHz Amplitude=5

Hz=1s/50us=20kHz Amplitude = 5 Part 3. Using a function generator to display square and triangular waveforms: Using the same setup as that for the previous experiment, you display the square and the triangular waveforms. You just need to select the desired waveform on the front panel of the function generator. Display the square and triangular waveforms of 10kHz frequency and take screenshots for the report.

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Part 4. Varying the duty cycle of a square wave to generate positive and negative going pulses: In Part 3, you displayed the square wave having a duty cycle of 50%. This made nice square waves having an equal length of high and low levels. In digital systems, you frequently need positive and negative going pulses which are used to trigger various functions. One way of generating such pulses is to simply vary the duty cycle of the square wave. Run two simulations of a square wave with duty cycles of 20% and 80% respectively. Include the screenshots in your report along with an explanation of what you see. 20% 80%

By changing the percent of the duty cycle, it varies the percentange time of the pulse. A 20% duty cycle results in only 20% of the pulse being activated whereas an 80% duty cycle results in 80% of the pulse being activated. Conclusion: This laboratory experiment had the users utilize various components of MultiSim, including XMMs, Oscilloscopes, and function generators. The lab posed various configurations of sources, resistors, and ground to ensure that XMMs would properly meaure voltage and current supplied. Graphical displays from function generators and oscilloscopers were shown in sine, square, and triangular form and their data used to confirm their accuracy through manual math. These components, having been shown to be accurate, can be utilized in future assignments with surety to their accuracy.