Circuit Analysis Labs to Accompany:
Circuit Analysis Theory and Practice Fifth Edition – A.H. Robins and W.C. Miller Student Name: _________________________ LAB 11 – AC Circuits
Objectives: After completing this lab you will be able to
- Create and observe RL and RLC circuits AC response
- Demonstrate basic measurements using oscilloscope
Required Equipment: - Oscilloscope,
- AC power supply,
Components: - Breadboard, Wire Strippers and 22awg Wire,
- Resistors,
- Capacitors,
- Inductors,
Reference: Oscilloscope presentation,
Chapter 15, Chapter 16, Chapter 17 1KΩ X1
1µF X1
1mH X1 Circuit Analysis Labs to Accompany: Circuit Analysis Theory and Practice
Continued … LAB 10 – RL and RLC Circuits, Steady State Response
Lab Schematic: Part A – RC Circuit
Procedure: Part A
Calculations: in circuit of Figure L11-1, find the voltages at nodes A and B. Using these voltages, find the voltage
across each impedance. Using calculated voltages, amplitude across each resistor and the capacitor, find the
amplitude of current for each impedance.
Experiment: Assemble the circuit of Figure L11-1. Using oscilloscope, apply a sinusoidal input with amplitude of
5v and measure voltages at nodes A and B for 500 Hz, 1 KHz and 5 KHz frequencies. Voltages Frequency Amplitude Average Node A
Node B
Node A
Node B
Node A
Node B Impedance
R1
C1
R1
C1
R1
C1 500 Hz 5 KHz R1=1kΩ B C1=1µF Figure L11-1 AC response of the RC circuit. Voltage
Effective 500 Hz
1 KHz
5 KHz For the 1 KHz input, on oscilloscope, observe
voltages at nodes A and B at the same time and
measure the phase difference between them.
Draw the XY (also called Lissajous) curve by
applying node A to X input and Node B to the Y
input of the oscilloscope and change the
horizontal mode to XY.
Draw the XY (Lissajous) graph. RMS AC 1 KHz Voltage
Frequency Amplitude A Circuit Analysis Labs to Accompany: Circuit Analysis Theory and Practice
Continued … LAB 10 – RL and RLC Circuits, Steady State Response Continued…
Lab Schematic: Part B – RL Circuit
Procedure: Part B
Calculations: in circuit of Figure L11-2, find the voltages at nodes A and B. Using these voltages, find the voltage
across each impedance. Using calculated voltages across each resistor and the inductor, find the current of each
impedance.
Experiment: Assemble the circuit of Figure L11-2. Using oscilloscope, apply a sinusoidal input with amplitude of
5v and measure voltages at nodes A and B for 100 KHz, 1 MHz and 5 MHz frequencies. Voltages Frequency Amplitude Average Node A
100 KHz
Node B
Node A
1 MHz
Node B
Node A
5 MHz
Node B Impedance
R1
L1
R1
L1
R1
L1 Voltage
Frequency Amplitude RMS AC R1=1kΩ B L1=1mH Figure L11-2 AC response of the RL circuit. Voltage
Effective 100 KHz
1 MHz
5 MHz For the 5 MHz input, on oscilloscope, observe
voltages at nodes A and B at the same time and
measure the phase difference between them.
Draw the XY (also called Lissajous) curve by
applying node A to X input and Node B to the Y
input of the oscilloscope and change the
horizontal mode to XY. Draw the XY (Lissajous)
graph. Instructor’s Initials: _____________________
(MM/DD/YY): _____ / _____ / ______ A

 

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