1. 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

3. Lab 10 Labview

4. 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 ApplicationsPendulum experiment Rotation frequency of rotor

5. Physical experiment User Interface VI

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

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

8. Changing signal type Front panel Run Stop Adding Controls

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

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

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

12. Open a blank VI Adding an Express VI that simulates the signal Modifying the signal 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

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

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

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

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

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