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14.5: Procedure

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  • 1. Build the circuit of Figure 14.4.1 using R = 1 k\(\Omega\) and L = 10 mH, but leaving off the load components. Replace the generator with a 50 \(\Omega\) resistor and determine the effective source impedance at 10 kHz using the impedance meter. Record this value in Table 14.6.1, including both magnitude and phase. Determine the load impedance which should achieve maximum power transfer according to the theorem and record in Table 14.6.1. Finally, determine values for \(R_{load}\) and \(C_{load}\) to achieve this load impedance and record in Table 14.6.1, also copying the resistance value to the first \(R_{load}\) entry of Table 14.6.2.

    14.5.1: Testing \(R_{load}\)

    2. Replace the 50 \(\Omega\) resistor with the generator. Insert the decade resistance box in the position of Rload and set it to the value calculated in Table 14.6.1. For \(C_{load}\), use the value calculated in Table 14.6.1. Use multiple capacitors if necessary to achieve a close value. Set the generator to 10 volts peak at 10 kHz, making sure that the amplitude is measured on the oscilloscope with the generator loaded by the circuit. Make sure that the Bandwidth Limit of the oscilloscope is engaged for the channel. This will reduce the signal noise and make for more accurate readings.

    3. Measure the magnitude of the load voltage and record in Table 14.6.2. Also compute the expected load voltage from theory and the load power based on the measured load voltage and record in Table 14.6.2. Repeat these measurements and calculations for the remaining load resistance values in the table.

    14.5.2: Testing \(C_{load}\)

    4. Return the decade box to the value calculated in Table 14.6.1. For \(C_{load}\), insert the first capacitor listed in Table 14.6.3. Repeat step four for each load capacitance in Table 14.6.3, calculating and recording the required results using Table 14.6.3.

    5. Generate a plot of \(P_{load}\) with respect to \(R_{load}\) and another of \(P_{load}\) with respect to \(C_{load}\).

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