# Turn the power amplifier on then click mon to begin

• Notes
• 4

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Turn the Power Amplifier on, then click “MON” to begin monitoring data; the Signal Generator should start simultaneously. 2. Select the “Smart Cursor” in the Scope display to determine the peak of the voltage across the resistor, or the red trace (V R ). 3. In the Signal Generator window adjust the frequency to increase by 10Hz each time it is prompted to increase and find amplitude of V R over the sine wave for 10Hz; then continue increasing this value and recording the datum displayed. 4. At 50Hz change the Sweep Speed in the Scope display from 1000 samples/sec to 5000 samples/sec using the “Increase Speed” button which allows for more accurate datum recording. Continue increasing the frequency until a 180Hz reading is achieved. 5. Look at the finished Data Table and approximately determine the resonant frequency (where V R reaches a maximum) 6. Once resonant frequency occurs the X-Y mode should exhibit the appearance of a diagonal line, any phase difference will show an oval trace as depicted below [1]. Data/Analysis :

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Questions : How does your measured value for resonant angular frequency compare to the theoretical value for resonant angular frequency? Is the plot of current versus frequency symmetrical about the resonant frequency? Explain. Yes, the plot of current versus frequency is perfectly symmetrical about the resonant frequency line.
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• Spring '12
• Dr.Phaneuf
• Physics, Power, Resistor, LRC, resonant angular frequency

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