lab4_Fall10

lab4_Fall10 - ME 365 EXPERIMENT 4 Exploring the PC...

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1 ME 365 EXPERIMENT 4 Exploring the PC Acquisition System and Examining Statistics of Sampled Signals Objectives: There are four objectives for this Laboratory: To gain an understanding of the PC data acquisition system, and how to use it well, To practice using LABVIEW to do data acquisition, To gain an understanding of how data from different sampled signals is distributed, To practice calculating simple statistics and confidence intervals for the mean. After this lab you should: Be able to acquire signals using the PC system that have low quantization noise effects and are not clipped or aliased, Be able to calculate confidence intervals and understand how many significant figures should be retained, Have a basic understanding of distributions of simple signals. Procedure: A. G ETTING THE DATA ACQUISITION AND SIMPLE STATISTICS VI TO WORK We'll begin by preparing a simple LabVIEW VI which obtains signals from the data acquisition system and sorts the data into bins for the chi-squared test. Some of the work in developing this VI has been done for you, and may be found in the Desktop\ME365\me365.llb library as a file labeled Distribution.VI . Start LabVIEW, and load this partial VI now . Save a copy of Distribution.VI to your network directory (R: Drive) and make all changes to that. The front panel of this VI has been completed for you, and looks similar to Figure 1. Note that the items labeled: "Number of Samples," "Sample Rate," and "Number of Bins" are numeric controls which must be filled in properly with the text tool before meaningful results may be obtained. The "Input Range" item is a text ring control, and may be cycled through a range of values by clicking on its arrows.
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Laboratory 4 Exploring the PC Acquisition System and ME365 Examining Statistics of Sampled Signals 2 Figure 1: Distribution.VI Front Panel If you haven't already, take a look at the incomplete wiring diagram for this VI by selecting Show Diagram from the Windows menu. All of the items from the front panel are present, as are some additional components. Of particular interest are the "365_DAQ_Acquire_multisample_single_channel" and "Histogram" blocks. Just as you might expect, these components are responsible for acquiring data and sorting the data into bins. Also notice the "case" component near the lower left-hand corner of the diagram. This component converts the text ring control output into input range values depending on which of the choices is selected. You may look at the different cases by
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lab4_Fall10 - ME 365 EXPERIMENT 4 Exploring the PC...

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