An oscilloscope is an instrument that graphs voltages over time.  Engineers and technicians use them to check voltage signals, especially ones that repeat too rapidly to measure with a simple voltmeter. 

In this activity, you will:

• Use an oscilloscope to graph the LED voltages over time.
• Examine how changing the duty cycle “looks” in an oscilloscope voltage vs. time graph.
• Use the Time/Div control to “zoom in” on the time axis to see more voltage “signal detail.”

Parts & Circuit

Same as Measure a Blinking Light with a Voltmeter (shown again below.)