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# expi7 - New Era University EE371 ElectricalCircuit2...

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New Era University College of Engineering and Technology EE 371 Electrical Circuit 2 Laboratory M 1:00pm-4:00pm Experiment No. 7 FREQUENCY RESPONSE OF A REACTIVE CIRCUIT Ariola, Crisvan Jimbert  A. Rating: 3 nd year / BS EE D.O.P.: August 22, 2011 Group I.A D.O.S.: September 11, 2011 Arnel Ancheta Asst. Leader Engr. Reynaldo M. Dela Cruz Instructor Roland Alim Leader

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I. OBJECTIVES 1. To study the effect on impedance and current of a change in frequency in a series RL circuit. 2. To study the effect on impedance and current of a change in frequency in a series RC circuit II. EQUIPMENTS A. Power Supplies: 1. AF signal generator B. Instruments: 1. EVM or DMM C. Resistors : 1. 1 pc. 10,000-Ω D. Capacitors: 1. 1 pc. 0.1 µF E . Inductor: 1. 1pc. Large iron-core choke, 8 or 9 H III. PROCEDURE A. FREQUENCY RESPONSE OF AN RL CIRCUIT 1.Using an ohmmeter, measure the resistance of the 10-kΩ resistor and record the value. 2. With the AF signal generator off , connect the circuit of figure 3. Set the signal generator to its lowest output voltage and frequency. 3. Turn on the signal generator and set the output frequency to 50 Hz. Increase the output voltage until the voltage across the RL series circuit is V = 10 V rms. Maintain this voltage throughout the experiment. Measure the voltage across the resistor V R and record the value in the 50- Hz row. 4. Increase the frequency to 100 Hz. Check to verify that V = 10 V ; adjust voltage if necessary. Measure V R and record the value in the 100-Hz row. 5. Repeat step 4 by increasing the frequency in 50- Hz steps : 150, 200, 250 , 300, 350, 400, 450, 500 Hz. At each frequency measure V R and record the value. At each frequency verify that V = 10 V ; adjust voltage if necessary. After all the measurements have been taken, turn off the signal generator. 6. Using the measured values of V R and R , calculate the current in the circuit for each frequency. Record your answer. 7. Using the calculated value of current I and voltage V , calculate the circuit impedance Z for each frequency. Record your answers. B. FREQUENCY RESPONSE OF AN RC CIRCUIT
1.With the signal generator off , connect the circuit of figure 4. Set the signal generator to its lowest voltage output and frequency. 2.Turn

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expi7 - New Era University EE371 ElectricalCircuit2...

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