Week 1 - Edited-10/02/2008 Experimental Methods Laboratory...

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Edited-10/02/2008 Experimental Methods Laboratory Manual ME-120 Sudeep Raul Jude Gonsalves General Instructions The first three weeks in the lab, mainly focus on LabVIEW. Hence students are advised to understand the software. This manual does not provide step by step procedure for all the exercises, hence students need to use their creativity in building the programs. The laboratory session will generally begin with a Pre-lab lecture The Pre-lab lecture will include the theory necessary for the practical session The instructor may conduct periodic quizzes, to test the student’s knowledge in the software. The instructor may assign home-work, which will be due the following week. In case of any queries, you may contact your instructor for guidance.
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Week-1 Exercise 1 Virtual Instrument Aim: To understand the basics of LabVIEW To understand Signal Generation and Processing To examine the change in the graph, when the frequency and the input signal is varied. Note: Do not save any changes made in the program. Procedure Front Panel 1. From the start up menu, select Start>programs>National Instruments>LabVIEW 8.2. Lab-VIEW dialog box appears on the screen 2. Since we are only analyzing signal generation and processing without developing the program, we will have to select the program from the examples provided by National Instruments. Select Help>find examples. The dialog box appearing contains all the available LabVIEW examples. 3. On the browse tab, select browse according to task. Choose Analyzing and Processing signals, then signal generation and processing VI. Note: The above example can also be opened using the open VI button and navigating to LabVIEW\examples\apps\demos.llb\signal generation and processing VI. 4. Click the run button on the toolbar, to run the VI. The run button appears as The VI determines the result of filtering and windowing a generated signal. This example also displays the power spectrum for the generated signal. The resulting signals are displayed in the graphs on the front panel, as shown in the following figure.
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4. To change the input signal and the signal processing, the operating tool can be used. Operating tool is located on the tools palette. On the front panel click view>tools palette. 5. Press more info button or F5 to understand more about analysis function. 6. Press the stop button or F4 to stop the VI\ Block Diagram 7. Block diagram contains all the necessary components required to perform a particular Task. Block diagram can be accessed from the front panel. Window>show block diagram. You can also access the block diagram by pressing <ctrl-E>.
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<Meta-E> and Linux<Alt-E> 8. To access the front panel again select Windows>show Panel or press < Ctrl-E> 9. Close the VI. Deliverable:
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Week 1 - Edited-10/02/2008 Experimental Methods Laboratory...

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