ME345_Lecture_15 - frequency inferred from the acquired...

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M E 345 Spring 2008 Professor John M. Cimbala Lecture 15 02/18/2008 Today, we will : Review the pdf module: Digital Data Acquisition Do some example problems – digital data acquisition Example Given : The integer 78 (base 10). To do : Write this integer in 8-bit binary format. Solution :
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Example Given : A voltage signal ranges from -1.2 to 1.4 volts. A digital data acquisition system is to be chosen – four choices are available: (a) 12-bit A/D range = -10 to 10 V (b) 8-bit A/D range = -2 to 2 V (c) 10-bit A/D range = -5 to 5 V (d) 14-bit A/D range = -1 to 1 V To do : Determine which system is the best choice for this application, assuming that cost is irrelevant (all four are available in the lab). Solution :
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Example Given : Consider the following scenarios. To do : In each case, calculate the perceived
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Unformatted text preview: frequency inferred from the acquired digital data. ( a ) The actual signal is f = 600 Hz. The data are sampled at f s = 2000 Hz. Solution : ( b ) The actual signal is f = 600 Hz. The data are sampled at f s = 900 Hz. Solution : ( c ) The actual signal is f = 600 Hz. The data are sampled at f s = 600 Hz. Solution : ( d ) The actual signal is f = 600 Hz. The data are sampled at f s = 500 Hz. Solution : Example Given : A voltage signal contains a sine wave at 600 Hz. We sample the data digitally at a sampling frequency of 320 Hz. To do : What is the perceived frequency obtained from the digital data acquisition system? Solution : 0 0.2 0.4 0.6 0.8 1.0 f a / f folding f / f folding 2.0 2.2 2.4 2.6 2.8 3.0 4.0 1.2 1.4 1.6 1.8 5.0 4.4 4.6 4.2 4.8 3.4 3.6 3.2 3.8 f / f folding...
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This note was uploaded on 07/23/2008 for the course ME 345 taught by Professor Staff during the Spring '08 term at Pennsylvania State University, University Park.

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ME345_Lecture_15 - frequency inferred from the acquired...

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