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11.1.6: Procedure

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    1. Calculate the voltage gains (losses) for the voltage divider of Figure 1.5.1 for the resistor values specified, and record them in Table 1.7.1. Also, convert each of the ordinary gains into decibel form.

    2. Assemble the circuit of Figure 1.5.1 using the 22k resistor.

    3. Set the generator to a 100 Hz sine wave, 0 dBV (Note: If the meter is calibrated in dBu, then use 0 dBu).

    4. Apply the generator to the circuit. Measure and record the output voltage in Table 1.7.1 using the decibel-reading voltmeter. Also, compute the resulting experimental decibel voltage gain and gain deviation.

    5. Repeat step 4 for the remaining resistor values in Table 1.7.1.

    6. To create a simple Bode plot, the lag network of Figure 1.5.2 will be used. Assemble this circuit and record its theoretical critical frequency in Table 1.7.2.

    7. Set the generator to a 1 kHz sine wave, 0 dBV.

    8. Apply the generator to the circuit. Determine the experimental critical frequency by adjusting the frequency of the generator until the circuit’s output voltage is –3 dBV. Record the measured frequency in Table 1.7.2.

    9. Set the generator to a sine wave at one-tenth of the experimental critical frequency.

    10. Adjust the generator’s output level to 0 dBV.

    11. Apply the generator to the circuit. Measure and record the output level in decibels in Table 1.7.3. Also, measure and record the phase angle between the input and output waveforms and record it in Table 1.7.3.

    12. Repeat steps 9 through 11 for the remaining frequencies listed in Table 1.7.3.

    13. Using the values from Table 1.7.3, create a Bode plot for this circuit using a log scaled horizontal axis (i.e., semi-log paper).

    1.6.1: Computer Simulation

    14. Build the lag network of Figure 1.5.2 in a simulator and run an AC Analysis. Be sure to run this from at least one decade below the critical frequency to at least one decade above. Also, use a decibel scale for the gain amplitude. Compare the results to the Bode plot generated in Step 13 and include this graph with the technical report.

    This page titled 11.1.6: Procedure is shared under a CC BY-NC-SA license and was authored, remixed, and/or curated by James M. Fiore.

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