Review and Practice


  • In this activity, you:
    • Measured the pushbutton and LED voltages with an oscilloscope
    • Learned how the plotted data relates to what’s actually happening with the circuit voltages
    • Studied start pulses, which are used in electronics to initiate communication and other events
    • Used oscilloscope trigger settings to align that start pulse with a certain time to make the plot easier to view.
    • Were you able to test the signal activity in the pushbutton and LED circuits?
  • Do you understand the oscilloscope graph and how to manipulate the view of the information?
  • Do you understand start pulses?



  1. Where can you find oscilloscopes used in real-world applications?
  2. What types of information might be contained in a start pulse?
  3. What happens to the oscilloscope graphs if the plotted line(s) runs off the right side?
  4. What is a trigger ‘edge’ and the default trigger voltage on the CYBERscope?



  1. Why is the black trace line connected to the pushbutton at 0 V when the pushbutton is not pressed?
  2. Why is the red trace line connected to the LED at 0 V when the pushbutton is not pressed?


  1. Adjust the volts on the graph so that the trigger edge will be 2 V. What change do you notice?
  2. Change the Your Turn program to evaluate the signal for the yellow LED. What do you observe?
  3. Modify the Your Turn script so that the LED stays on for 750 ms and off for 250 ms. What do you notice about the graph?