CBER 702 Lab 2 Multisim Installation and Demonstration

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Durham College *

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CYBERSECUR

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Electrical Engineering

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Jan 9, 2024

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Lab 2 Page 1 of 12 School of Engineering Technology and Applied Science (SETAS) Information and Communication Engineering Technology (ICET) CBER 702: Communication Networks Lab2: Multisim Installation and Demonstration Name Student ID Signature* * By signing above, you attest that you have contributed to this submission and confirm that all work you have contributed to this submission is your own work. Any suspicion of copying or plagiarism in this work will result in an investigation of Academic Misconduct and may result in a “0” on the work,

Lab 2 Lab 2.1 Multisim Installation With Multisim, students can drop simulation-driven instruments onto a circuit schematic and interact with a circuit just like in the hardware lab. They can make measurements, probe, and troubleshoot a circuit instruments that look and function like their real-world counterparts. 1. Creating an Account on the National Instrument (NI) Community Multisim download requires an account with NI community. Unless you have a previous account, create new account at the link https://forums.ni.com/t5/Using-the-NI-Community/Creating-an-Account-on-the-NI- Community/ta-p/3698611?profile.language=en When you're ready to register, click on the Register for the community link seen in the blue banner at the top of forums.ni.com. You can either create a new NI user account or log in with an existing NI user account. If you click on the Register for the community and create a new NI user account , you will be logged in automatically upon completion of the form. Page 2 of 12

Lab 2 2. Once you have an NI account, you can start download Multisim from the following link: https://www.ni.com/en-ca/support/downloads/software- products/download.multisim.html#312060 From the popup window, select Education and click download Page 3 of 12

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Lab 2 You will be asked to login to your NI account to download the installer. Once you login, the NI installer will be downloaded to your PC as shown: 3. Right click the installer and select Run as Administrator. This will start the installation process. In the following window, select I Accept the Above 2 License Agreements. Page 4 of 12

Lab 2 4. Click Next >> Next (click next until you get the following window) 5. In Check my account for licenses drop list, select Enter a Serial Number Page 5 of 12

Lab 2 6. Scroll down the window and type in the serial number ( M85X53924 ) shown 7. Click Activate then Click Finish 8. Run Multisim ( Take Screen shot 1) Lab 2.2 - Signal Generation and Measurement in Time Domain Learning Objectives Upon completion of this lab, students will reliably demonstrate the ability to:  Setup the Function Generator and adjust the frequency and amplitude of various signals  Setup an Oscilloscope and visualize signals for various adjustment Page 6 of 12

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Lab 2  Gain an understanding of signal representation in time domain Equipment Required A computer with Multisim installed Within Multisim use: Agilent Function Generator : A function generator is usually a piece of electronic test equipment or software used to generate different types of electrical waveform s(sine wave , square wave, triangular wave and sawtooth shapes) over a wide range of frequencies. https://www.youtube.com/watch?v=PMHrgCdaEoc Tektronix Oscilloscope: Electronic test instrument that graphically displays varying signal voltages, usually as a calibrated two- dimensional plot of one or more signals as a function of time https://www.youtube.com/watch?v=ubvyEaLYYA0 Overview In analog communication, the transmitted message is often an audio message such as music or voice. However, these signals have quite variables characteristics. Time domain analysis is often used to study signal’s characteristics where waveform, amplitude, period and phase of a signal are the main concern. In the laboratory, time domain observation and measurements of a signal are done using a menu driven digital oscilloscope. To study phenomena associated with amplitude or frequency modulation, we will substitute simpler signals with controllable parameters. These signals will be supplied by the Agilent Function Generator. Procedure 1. Using Multisim, set up the modules (From right Panel) as shown in Figure 2.2.1 and power up the equipment. Figure 2.2.1 Suggested Module Arrangement 2. Connect OUTPUT of the Function Generator to CH 1 of the Oscilloscope. Page 7 of 12 Function Generator Oscilloscope

Lab 2 3. Select the Sinusoidal waveform of 1 kHz Frequency. 4. Adjust the Amplitude from the Function Generator to obtain a peak-to-peak amplitude of 2Vpp, as shown in Figure 2.2.2. Figure 2.2.2 Agilent Function Generator 5. Set the oscilloscope controls to observe two or three periods of the signal on the oscilloscope screen, as shown in Figure 2.2.3. Figure 2.2.3 Tektronix Oscilloscope 6. On the Agilent Function generator, a. Select the Square waveform, adjust Oscilloscope and Take Screen shot 2 b. Select the triangular waveform, adjust Oscilloscope and Take Screen shot 3 c. Select the sawtooth waveform, adjust Oscilloscope and Take Screen shot 4 7. For the Pulse function, pulse width of the Square wave may be adjusted using the %Duty function between 20% and 80% as shown in Figure 2.2.4 Page 8 of 12

Lab 2 Figure 2.2.4 8. Select the %Duty function between 80%, adjust Oscilloscope and Take Screen shot 5 2.3 True RMS (Root Mean Square) Voltmeter / Power Meter as a Voltmeter Learning Objectives Upon completion of this lab students will reliably demonstrate the ability to: Measure the true RMS value of most of the common signals Equipment Required A computer with Multisim installed Within Multisim use: Tektronix Oscilloscope Agilent Function Generator Agilent Multimeter: A digital multimeter is a test tool used to measure two or more electrical values—principally voltage (volts), current (amps) and resistance (ohms) ( https://www.youtube.com/watch?v=aM4RYTl2sTU ) Procedure 1. Using Multisim, set up the modules as shown in Figure 2.3.1 and power up the equipment. Figure 2.3.1 Suggested Module Arrangement Page 9 of 12 Oscilloscope Multimeter Function Generator

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Lab 2 2. Connect OUTPUT of the Function Generator to both the INPUT of the Multimeter and one of the Oscilloscope channels. 3. Set the Function Generator for a 100 Hz Sinusoidal signal. 4. Adjust the Amplitude from the Function Generator to obtain a peak-to-peak amplitude of 2Vpp. 5. Measure the RMS voltage using the Multimeter, as shown in Figure 2.3.2, and record your results in Table 2.3.1. Figure 2.3.2 Vrms from Multimeter 6. Repeat the preceding measurements using a square-wave, a triangle-wave, and a sawtooth-wave. 7. Record your results in Table 2.3.1. Table 2.3.1 RMS Voltage-Frequency Frequencies 100 Hz 1 kHz 10 kHz 100 kHz Average Signal V rms 1 V pk V rms 2 V pk V rms 3 V pk V rms 4 V pk 1 + 2 + 3 + 4 4 Sine Wave Square Wave Triangle Wave Sawtooth Wave Page 10 of 12

Lab 2 8. Theoretical calculated RMS Values for Different waveforms 9. Compare the average of the ratio calculated in Table 2.3.1 for each signal, with the theoretical values calculated using the RMS formulas shown in Figure 2.3.3. Explain your observations. ( Write the answer in Lab Worksheet) 10. For Pulse Signal measurements, select the Square wave function at 100 Hz and set the peak voltage to 1 V. 11. Adjust the pulse to its minimum width by selecting the 20% Duty Cycle and note the RMS reading on the Multimeter. 12. Slowly increase the pulse width by increasing the Duty Cycle to 80%. 13. How does this affect the oscilloscope trace and the RMS voltage reading on the Multimeter? ( Write the answer in Lab Worksheet) 14. Set the duty cycle of the pulse to minimum and vary its width again, using 1 kHz, 10 kHz, and 100 kHz. 15. Record your observation and comment on your observations. ( Write the answer in Lab Worksheet) Page 11 of 12

Lab 2 Lab 2.4 Lab Challenge: Calculations on dBm, dB. Learning Objectives Upon completion of this lab, students will reliably demonstrate the ability to convert watts to dBm and vice versa and explain the rules on 3 dB and 10 dB 2.4.1 Convert the following to dBm: milliwatts dBm 1000 100 50 25 13 0.5 0.25 0.13 Copy to Lab Worksheet 2.4.2 Convert dBm to milliwatts dBm milliwatts 1 30 40 -10 -30 -90 Copy to Lab Worksheet 2.4.3 Explain the 10s and 3s rules in the chart below: https://www.youtube.com/watch?v=VqoUS-ecw4Y Value Explanation (sentence e.g. 3 times the value) Percentage Power gained or lost (%) e.g. 15% Current Power level (compared to the original) Explanation/ Calculation -3 dB Half the value +3 dB -10 dB + 10 dB Copy to Lab Worksheet Page 12 of 12

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