LAB 3 Periodic Signals in Time Domain

# LAB 3 Periodic Signals in Time Domain - Periodic Signals in...

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Periodic Signals in Time Domain Abstract: The purpose of this lab is to observe different AC signal waveforms. In this experiment we used a function generator and an oscilloscope. We learned how to read the graphs and determine important components like, the amplitude, the voltage, the frequency, and the period of the waves. We then connected the oscilloscope to the computer to send sound files and graph the waves. From the waves we could measure the period and ultimately calculate the frequency using the equation f=1/T. We then used a voltage divider to examine the behavior of a simple circuit. We determined that the resistance did not have an affect on the frequency of a wave. We also verified ohms law using the information in the graph. As the resistance increased, so did the voltage across it. Next we constructed a half wave rectifier and compared the graphs of the AC voltage in the circuit and the AC voltage across the diode. We were able to use the peak-to-peak voltages to determine the turn on voltage of the diode. We also verified the DC voltage using an equation and the multimeter. In the last part of the experiment we used a square wave voltage source on a simple RC circuit to observe the charging on the capacitor. When the voltage was at its peak, the capacitor would charge and when the voltage was at its low point the capacitor would discharge. Part 1: Function Generator and Oscilloscope In this part of the experiment we used a function generator to create the AC currents and we used the oscilloscope to display the graphs. Below in figures one through four you can see four different types of AC waves. Figure 1 shows a sine wave, figure 2 shows a square wave, figure 3 shows a triangular wave, and figure 4 shows a saw-tooth wave. In order to create these waves we connected the function generator to the input channel of the oscilloscope. After connecting the function generator to the oscilloscope we need to setup the function generator to produce the waveform we are looking to measure. To select the type of wave form you need to click the button with the picture of the waveform you want. Then you need to set up the values on the function generator. The

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## This note was uploaded on 03/21/2008 for the course ECE 200 taught by Professor Escuti during the Spring '07 term at N.C. State.

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LAB 3 Periodic Signals in Time Domain - Periodic Signals in...

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