Amplitude Modulation

This is a test to see whether you can use an oscilloscope to measure properties of an amplitude-modulated carrier wave. On the next screen, you will watch a short movie that demonstrates the activity. Then you will see a simulated oscilloscope. The signal on the cable is a combination of two sine waves, a carrier wave with an amplitude modulation (AM).

Use the scope to measure the frequency of both waves and calculate the modulation index.

Make these measurements as quickly and efficiently as you can without being sloppy. Note: You may use a calculator if you need one.

When you finish the test, click the report button to see your score.

Good luck, and thank you for helping us with our research!

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Amplitude Modulation

The movie below will help you complete this assessment. After it loads, click on the movie to Play. When done, click the "Continue" link below.

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cc_wrap_scope2.vi

Amplitude Modulation

Oscilloscope: Measuring Frequency

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Instructions:
  1. Click on Launch Oscilloscope button to open the oscilloscope window.
  2. Connect the wire to either channel A or B by clicking on the port.
  3. Turn on the oscilloscope and find the frequency of both the modulating wave and the carrier wave. Find also the modulation index.
  4. Type your answers in the boxes below.
  5. Click on the Submit Answer button to finish.
Carrier Frequency
Modulator Frequency
Modulation Index
 Value Unit %