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Physics 145 Introduction to Experimental Physics I Instructor: Karine Chesnel

Physics 145 Introduction to Experimental Physics I Instructor: Karine Chesnel Office: N319 ESC Tel: 801- 422-5687 kchesnel@byu.edu Office hours: on appointment Class website: http://www.physics.byu.edu/faculty/chesnel/physics145.aspx. Lab 10 Labview. Applications.

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Physics 145 Introduction to Experimental Physics I Instructor: Karine Chesnel

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  1. Physics 145 Introduction to Experimental Physics I Instructor: KarineChesnel Office: N319 ESC Tel: 801- 422-5687 kchesnel@byu.edu Office hours: on appointment Class website: http://www.physics.byu.edu/faculty/chesnel/physics145.aspx

  2. Lab 10 Labview

  3. Applications Pendulum experiment Rotation frequency of rotor Lab 10: Labview Follow the Manual • L10.1: Chapter 1: Building a Virtual Instrument (VI) • L10.2: Chapter 2: Analyzing and saving a signal • L10.3: Chapter 3: Expanding the features of a VI • L10.4: Chapter 4: Data Acquisition

  4. User Interface VI Physical experiment

  5. Goal: Build a front panel Knob: to control a parameter STOP button to stop measuring Graph: to visualize signal in real time

  6. Preview of the Front panel Preview of the Block Diagram

  7. Adding Controls Front panel Run Stop • Changing signal type

  8. Block diagram • Displaying two signals • on the graph • Wiring objects on the • Block diagram • Running the VI • Modifying the signal • (ex: arithmetic operation) • Customizing the knob • Customizing the waveform

  9. Goal: Generate and analyze a signal Peak to peak amplitude Simulated signal Warning LED: if signal exceeds a certain level

  10. Block diagram • Analyzing the amplitude • of the signal • Adding a warning light • Setting the warning level • Saving the data to file • Open a blank VI • Build the block diagram

  11. Block diagram • Configure the VI to run • continuously until user stops it • Controlling the speed of • the execution (time delay) • Using a table to display data • Open a blank VI • Adding an Express VI • that simulates the signal • Modifying the signal

  12. Goal: Adjust the data sampling and display data Average value Table of Averaged values

  13. Goal: Acquire real experimental data Using the DAQ assistant system

  14. DAQ assistant • Open a blank VI • Insert the DAQ assistant • Enter Input signal • (Analog Input) • Select physical channel • Adjust input range • Adjust number of samples • Graphing data from DAQ

  15. time Pendulum experiment • Adjust rate and number of samples • Adjust custom scaling

  16. laser Laser light blocked by tape Rotor axel w/ tape Periodic signal photodiode Rotation frequency of rotor Measure period as function of voltage Plot rotor frequency (Hz) vs voltage (V)

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