Electronics Lab Past Paper PDF
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This document contains a series of activities for an electronics lab, particularly focusing on function generators, oscilloscopes, and DC power supplies in relation to signal generation methods, including sine waves, triangular waves, and different voltage generation aspects. The activities involve setting up equipment, measuring and analyzing electrical signals, and recording results.
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# Function Generator/ Oscilloscope/ Power Supply/ Multi-Meter (80 points for the report and 20 points for the preparation) ## **A. Objectives** 1. Generate a sine, square, triangular function from the function generator with different amplitudes, DC offsets, phases and frequencies. 2. Adjust the s...
# Function Generator/ Oscilloscope/ Power Supply/ Multi-Meter (80 points for the report and 20 points for the preparation) ## **A. Objectives** 1. Generate a sine, square, triangular function from the function generator with different amplitudes, DC offsets, phases and frequencies. 2. Adjust the settings on the oscilloscope to view any given function from the function generator or from a real sensor. This includes the ability to view two channels at a time, use AC/DC coupling. 3. Use the spectrum analyzer and the math function of the oscilloscope. 4. Store data from the oscilloscope into a flash drive and view the data on Excel for analysis. 5. Generate DC voltage from the power supply at any required value. 6. View the output DC voltage on the oscilloscope. 7. Use all the functions on the multi-meter effectively. 8. Realize the precautions for measuring the voltage, current, resistance on the multi-meter. ## **B. Function Generator** This device generates different kinds of signals. It can generate a sine wave, square wave and a triangular wave. You can control the amplitude, the frequency, the phase and the DC offset of the wave generated. To see the generated function, you will use the oscilloscope. <br> **Figure 1.1: Function generator** <br> ## **Activity #1:** Make sure you know how to set the function generator to produce the following signal: Y=2+0.5(sin 200 πt). Sketch the signal. (5 points) **Hint:** In the above sine-wave signal, the DC offset is 2 volt, the signal amplitude is 0.5 V and the frequency is 100 Hz. In the function generator in the lab, you cannot see the value of the DC offset or the amplitude. You will use the oscilloscope to adjust these values. ## **Activity #2:** Set the function generator to a triangular wave of frequency 1 kHz. Move the amplitude button and watch the signal on the oscilloscope. Apply a DC offset. Sketch the signals. (5 points) ## **Activity #3:** What is the frequency range that can be generated using this function generator? What is the amplitude range? (5 points) ## **C. Oscilloscope** The oscilloscope is a device that allows you to view the signal with time and to view its frequency content as well. The oscilloscope in our lab has two channels and therefore you can see and compare two signals at a time. It also has digital-storage capabilities and spectrum analyzer. <br> **Figure 1.2: Digital-storage oscilloscope** <br> ## **Carefully study all the buttons in the oscilloscope to do the following:** 1. Learn how you can see channel one only, channel two only, or both 2. Learn how to find the zero line for each channel (set to GND). 3. Learn how to set the horizontal axis (ms/division, position). 4. Learn how to set the vertical axis for channel one (volt/division and position). 5. Learn how to set the vertical axis for channel two (volt/division and position). 6. Learn the difference between DC and AC coupling. 7. Learn how to set the intensity and focus of the curves. 8. Learn the math function. 9. Learn the measurement function. 10. Learn the spectrum function. 11. Learn how to save the viewed data on a flash drive ## **Activity #4:** Use the function generator to generate two different signals (a sine wave and a triangular wave). Select the amplitude and frequency yourself. Watch the sine-wave signal on Channel one and the triangular wave on channel two. Watch both together and watch their sum. Sketch these signals. Make sure that the frequency you read on the oscilloscope is the same as you read on the function generator. (10 points) ## **Note:** In the oscilloscope in the lab, sometimes the signal starts to “move” horizontally. If this happens, change the ms/division, adjust the sweep rate or the frequency of the input signal. ## **Activity #5:** Generate and view the signal Y= 2 + 0.5(sin 200 πt). Watch the signal with DC coupling and with AC coupling. Sketch both signals. (5 points) ## **Activity #6:** Get a thermocouple (type K) and connect it to a temperature reader, then connect it to a voltmeter and then to an oscilloscope. Watch the output of these three devices as you approach a match to it. Comment. (5 points) **Please note:** Do not leave this part unless you are confident with your abilities to operate the oscilloscope and function generator. ## **Activity #7:** Sketch the function generator panel and state the function of the buttons you used (5 points) ## **Activity #8:** Sketch the oscilloscope panel and state the function of the buttons you used (5 points) ## **D. DC Power Supply** <br> **Figure 1.3: DC power supply** <br> ## **Activity #9:** Generate different voltages from the power supply - Measure them using a multi meter (5 points) ## **Activity #10:** View the generated voltages from the power supply on the oscilloscope (5 points) ## **E. Digital Multi-Meter** <br> **Figure 1.4: Multi meter** <br> ## **Activity #11:** Sketch the screen of the digital multi-meter, and write down the function of the different buttons (5 points) ## **Activity #12:** State the precautions for measuring the voltage, current, resistance on the multi-meter (10 points) ## **Activity #13:** Use the serial number on the above devices to download their technical manuals and write in a table form their main technical specifications (10 points)
