me120 lab report 1 - Waveform Data Acquisition Experiment...

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Waveform Data Acquisition Experiment ME 120 Experimental Methods Lab Section 2 Experiment Date: February 23, 2009 March 2, 2009
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Abstract We used LabVIEW 8.2 to create a program where it can display two output graphs. One showed a sample graph reading that consists of a change of amplitude due to a change of time. The other was a display of a voltage power spectrum where it showed a change of amplitude due to a change in frequency from the Data Acquisition board. This was done by creating a while loop that included different relationships within the LabVIEW block diagram components that gave us the option to manipulate different inputs like Number of Samples and Sample Rates. By doing this we found that making the program run 100 samples at our chosen sample rate of 1000, the power spectrum graph outputted a range that was half of the sample rating. As the frequency was increased from the Data Acquisition and surpassed the given range, it would try to readjust itself to give a more accurate reading. We found that what was being displayed before exceeding the range was a misrepresentation of what was actually going on. This representation is called aliasing where under sampling is occurring Background and Objective 2
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The purpose of this lab experiment was to familiarize ourselves with different concepts and procedures in order to accurately understand how the Data Acquisition was integrated to the program. Through this integration, we also had to see how they are related to the Sample Theorem and Aliasing. To fulfill the purposes of this experiment, we found that the higher the sample rating was,
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This note was uploaded on 09/08/2010 for the course ME 120 at San Jose State University .

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me120 lab report 1 - Waveform Data Acquisition Experiment...

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