RLC Circuit and Resonance

This demonstration shows resonance in an RLC circuit. The pico scope shows a plot of the voltage across the resistor which is proportional to the current in the circuit. Therefore, when the maximum amplitude occurs for this, there is resonance.

Setup:

Set the whiteboard on the lab table. Connect the webcam to the projector and set it up to view the whiteboard from above.

Using circuit scribe build the circuit shown above. Connect the function generator to the circuit. Connect channel A of the pico scope across the resistor.

Set the function generator to the 1k sine wave range between 3 and 4 on the dial.

Open the pico scope software and turn on channel B. Set channel A to Auto and AC. Choose 50 micro s per division and 100 kS. At the bottom of the screen, Trigger should be set to Auto.

Turn on the function generator and observe the graph.

Turn the dial on the function generator up and down until you see the graph's amplitude rise and then fall. The maximum amplitude occurs at resonance.

Notes:

Be sure that all the grounds for the pico scope are connected at the same point as the ground for the function generator!

Courses Used In:

• PHY 10320

• PHY 20435

• PHY 30220

Discussion and Polling Questions:

Coming Soon

Equipment Needed:

• Circuit Scribe Kit

• Whiteboard

• One BNC to Banana Cable

• Pico Scope

• BK Precision Function Generator

• Demo Computer

• Webcam

• 2.7 k ohm Resistor

• 25 mH Inductor

• 2.2 nF Capacitor