# Exp7 - Exp#7 Spectral Analysis 49 Exp#7 Spectral Analysis...

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49 Exp#7: Spectral Analysis

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50 Exp#7: Spectral Analysis of Digital Signals Objectives There are three objectives of this lab: 1. To learn and practice interpretation of power spectra. 2. To learn how to use the spectrum analysis software package. 3. To demonstrate the effect of sampling frequency, and the Nyquist sampling theorem, on discrete signals. Part 1. Sine waves and square waves Generate a 200Hz sine wave with 2V rms amplitude and 0V offset. Using the Digital Spectrum Analyzer (DSA) component of the data acquisition software (Vbench), measure the power spectrum of this signal. Make sure no other Vbench component (such as the VScope) is running at the same time. There are two important parameters to choose: the sampling frequency, f s , and number of samples, n . Make f s a simple number, like 500, for example, and set n equal to some power of 2 ( e.g. 256, 512, 1024). These parameters can be modified under the [Edit/Settings/Acquisition] menu options. You are encouraged to experiment with these and observe the effect of changing them. When you have settings that are satisfactory, then note the peak frequency in the power spectrum from the screen marker, and write it down. Remember to include an uncertainty estimate. Save the data on disk using the "Generate Report" option. Save "Display 2" only, which is the power spectrum. It will be saved in ASCII format can be read into a spreadsheet later on. Now do the same thing for a square wave with the same amplitude and frequency. You may like
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Exp7 - Exp#7 Spectral Analysis 49 Exp#7 Spectral Analysis...

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