Electrotechnology 1200 Experiment 10 Series RLC Circuits

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PROCEDURE B (Determining resonant frequency)B1. MODE to DUAL, SOURCE to INT and PULL INVERT is pushed IN.B2. To the circuit in Figure 10-1, connect the oscilloscope to measure V R PP vs V CD PP .B3. Adjust V CD PP = 6V PP .B4. Switch CH-A and CH-B AC-GND-DC toGND. You will get two horizontal lines.Adjust VERTICAL POSITION to positionthe lines on the X-axis.Switch CH-A and CH-B AC-GND-DC toDC. Your waveforms should be centeredon the X-axis. The waveforms will be outof phase with each other, similar to thedrawing on the right.B5. At resonant frequency f R , X L = X C , and V Swill be in phase with the current I.Therefore if you adjust frequency until V R isin phase with V CD , you can determineresonant frequency.B6. Increase/decrease the frequency toattempt to get waveforms similar but notthe same as the ones shown on the right.As you adjust the frequency, examine bothwaveforms as they cross the X-axis. Makeyour frequency adjustments to bring thesepoints to the same place. Then they will bein phase.As you change frequency, adjust TIME/DIV and CH-A/CH-B VOLTS/DIV to keep 1-3waveforms on the screen.B7. Record the resonant frequency f R [10-3].B8. On pg. 110, calculate the theoretical resonant frequency for these components.ELTK1200 Experiment 10 Rev 5 114
B9. Disconnect the scope. MODE to CH-A(CH1).B10. Measure V R PP , V L PP and V C PP [10-3].B11. Calculate the current I, the inductive reactance X L , the capacitive reactance X C andthe phase angle θ [10-3].B12. Adjust the frequency to f R - 1000Hz. Repeat Steps B10 to B11.B13. Adjust the frequency to f R + 1000Hz. Repeat Steps B10 to B11.B14. Turn the Function Generator OFF.B15. Add a second 0.1μF capacitor in parallel as shown in Figure 10-2.Figure 10-2B16. Repeat Steps B2 to B14 for the circuit in Figure 10-2.B17. Turn the Function Generator OFF. Disconnect your circuit and return all equipmentto its proper place.ELTK1200 Experiment 10 Rev 5 115
Page 1 and 2: Electrotechnology 1200Experiment 10
Page 3 and 4: BASIC INFORMATIONThe analysis of se
Page 5: PROCEDURE A (Frequency Response of
Page 9 and 10: RESULTSTable 10-1RmeasR DC of Lmeas

Electrotechnology 1200 Experiment 10 Series RLC Circuits

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