{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

ME345_Lecture_15

# ME345_Lecture_15 - frequency inferred from the acquired...

This preview shows pages 1–4. Sign up to view the full content.

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 :

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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 :
Example Given : Consider the following scenarios. To do : In each case, calculate the perceived

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

{[ snackBarMessage ]}

### Page1 / 4

ME345_Lecture_15 - frequency inferred from the acquired...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online