ECE205 Lab 3_ RMS

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University of Illinois, Urbana Champaign *

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205

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Electrical Engineering

Date

Apr 3, 2024

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pdf

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5

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ECE 205 Lab 2: Regulators Contributors: Pertinent Dates: Lab Work Performed: 10/05/23 Report Submitted: 10/05/23 Statement of Purpose: The purpose of this lab is to explore the “bandwidth” of our DMM, using the function generator as a source, and measure its output with both the DMM (AC V) and the RMS mode of the oscilloscope. Also, the maximum frequency (separately, for sine and square waves) where the DMM and the oscilloscope continue to reasonably agree, should be determined. Plan: In order to explore the bandwidth of the Digit Multimeter, we used the waveform generator as a source with different waveforms, offsets, and coupling. Next, we can measure the output using both the DMM and an oscilloscope to see the RMS voltage measured. We can also explore the maximum frequency at which the DMM and oscilloscope reasonably agree by changing the frequency from the waveform generator until we see a significant increase or decrease in the RMS.
Figure 1. A diagram of the setup used for this experiment. Execution The setup for the experiment was constructed using the following: a multimeter a function generator an oscilloscope red and black banana plug cables, one of each color two coaxial cables The circuit was set up as shown in Figure 2.
Figure 2. A picture of the actual setup for this experiment. For each of the combinations of waveform, offset, and coupling as shown in Table 1 below, we recorded the RMS voltage as shown by the DMM and Oscilloscope. After recording data from the oscilloscope, the RMS voltage was calculated using Excel by squaring, averaging, and then taking the square root of all the values measured. All these measurements are shown in Table 1 below. Table 1. Measured or calculated RMS values for the output voltage of the circuit and the voltage drop across the LM317 regulator. DMM RMS (mV) Oscilloscope RMS (mV) Excel RMS (mV) sine wave 1V peak-peak, 1.00 kHz 352.6 353 352.9
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