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Laboratory Procedures
DeVry University
College of Engineering and Information Sciences
I.OBJECTIVES
 To simulate the operation of a series and parallel resonance circuit consisting of a resistor (R), an inductor (L), and a capacitor (C).
 To plot the resonance curves of the simulated RLC circuit by varying the AC voltage source. frequency.
 To build series and parallel RLC resonance circuit and to verify the results obtained by simulation.
II. PARTS LIST
Equipment:
Function generator
DMM (digital multimeter)
Parts:
1  470 Ω resistor 1  1 µF capacitor
1  47 mH inductor
Software:
MultiSim 11
III. PROCEDURE
A. Simulation of a Parallel Resonance Circuit
 Construct the RLC parallel circuit shown in Figure 1. Simulate the circuit at the frequencies shown in Table 1. Note and record the current readings obtained in the table with switch S1 closed. This represents the inductor as an ideal inductor with zero wire resistance.
The inductor selfresistance, RL = 65 Ω, has been included in the schematic after measuring the actual component. If the inductor you choose has different DC resistance, please feel free to modify the circuit.
 Plot the data obtained above in the graph sheet below. Note: frequency should be on the Xaxis; the source current IS (mA) should be on Yaxis.
Figure 1: Parallel Resonance Circuit
Frequency, Hz 
IS (RMS), mA 
IC (RMS), mA 
IL (RMS), mA 
200 



300 



500 



700 



730 



734 



738 



800 



1000 



1200 



1400 



Table 1: Parallel Resonance Simulation with Switch S1 “OFF”
Plot 1 – Parallel Resonance Data
 Answer the questions below:
a) 
What happens to the source current, IS, as the frequency is changed from low to high? Describe in your own words. 
Answer: 

b) 
Did the source current, IS, go through a minimum or maximum as the frequency is changed from low to high? 
Answer: 

c) 
What is the source frequency at the source current, IS, minimum? What do you call the frequency at that point? 
Answer: 

d) 
What do you notice from the values of the currents IC and IL at IS minimum? 
Answer: 

e) 
What is the phase relationship between IC and IL at IS minimum? 
Answer: 

f) 
What happens to the total impedance, ZP, of the parallel circuit at the current minimum? Choose the correct answer below: 
Answer: 

g) 
Why is the source current, IS, minimum at this frequency? 
Answer: 

 Turn the switch J1 in the simulator to the OPEN condition. Vary the source frequency between 700 Hz to 734 Hz (in steps of 2 Hz) to obtain the minimum source current, IS. Note it and also record the frequency below.
New resonant frequency with the J1 switch OPEN=Hz.
 Answer the questions below with the J1 switch open:
a) 
What happened to the inductive branch of the circuit with the switch J1 OPEN? 
Answer: 

b) 
Did the resonance frequency go UP or DOWN compared with the previous result? Circle the correct answer. 
Answer: 

c) 
Calculate the Quality Factor, Q of the inductor at this resonance frequency. 
Answer:


B. Simulation of a Series Resonance Circuit
 Construct the RLC series resonance circuit shown in Figure 2 in Multisim. Simulate the circuit at the frequencies shown in Table 2, and record the current readings obtained.
The inductor selfresistance, RL = 65 Ω, has been included in the schematic. If the inductor you choose has different DC resistance, please feel free to modify the circuit.
Figure 2: Series Resonance Circuit
Frequency, Hz 
IS (RMS), mA 
VC (RMS), mV 
VL (RMS), mV 
200 



300 



500 



700 



730 



734 



738 



800 



1000 



1200 



1400 



Table 2: Series Resonance Simulation
 Plot the data obtained above in the graph sheet below. Note: frequency should be on the Xaxis; the source current IS (mA) should be on Yaxis.
 Use the simulation results to answer the following questions:
a) 
What happens to the source current, IS, as the frequency is changed from low to high? Describe in your own words. 
Answer: 

b) 
What is the source frequency at the source current, IS, maximum? What do you call the frequency at that point? 
Answer: 

c) 
What do you notice from the values of the voltages VC and VL at IS maximum? 
Answer: 

d) 
What is the phase relationship between VC and VL at IS maximum? 
Answer: 

e) 
What happens to the total impedance, ZS, of the series L and C part of the circuit at this current maximum? Choose the correct answer below: 
Answer: 

f) 
Why is the source current, IS, maximum at this frequency? 
Answer: 

Plot 2 – Series Resonance Data
C. Construction of a Series or Parallel RLC Circuit and Measurement of Circuit Characteristics
 Construct the circuit in either Figure 3 or 4.
Important note: You do not need the switch arrangement for the parallel resonance circuit; The inductor selfresistance, which is an integral part, cannot be isolated as in the simulator analysis.
Figure 3 – Parallel Resonance Circuit
Figure 4 – Series Resonance
 Set the function generator voltage to 10 V RMS. Use the same value for frequency as used in the simulator experiment.
 Vary the source frequency as indicated in the simulation part of the lab exercise. Record the current readings. Tabulate the results below:
Frequency, Hz 
IS (RMS), mA 
200 

300 

500 

700 

730 

734 

738 

800 

1000 

1200 

1400 

Table 3 – Circuit Measurement Results
 Are the simulated and calculated values the same? ________ (YES or NO)
 If you answered NO, explain why you think they differ.
IV. TROUBLESHOOTING
Describe any problems encountered and how those problems were solved.
Laboratory Report Cover Sheet
DeVry University
College of Engineering and Information Sciences
Course Number: ECET210
Professor:
Laboratory Number: 5
Laboratory Title: Analysis of AC Series and Parallel RLC Resonance Circuits using Simulation and Construction
Submittal Date: Click here to enter a date
Objectives:
Results:
Conclusions:
Team: 






Name 

Program 

Signature 







Name 

Program 

Signature 







Name 

Program 

Signature 
Observations/Measurements:
III. A. 1. Parallel Resonance Circuit Simulation:
Frequency, Hz 
IS (RMS), mA 
IC (RMS), mA 
IL (RMS), mA 
200 



300 



500 



700 



730 



734 



738 



800 



1000 



1200 



1400 



III. A. 2. Parallel Resonance Circuit Plot:
III A. 3. Questions on Parallel Resonance Circuit with Switch J1 Closed:
a) 
What happens to the source current, IS, as the frequency is changed from low to high? Describe in your own words. 
Answer: 

b) 
Did the source current, IS, go through a minimum or maximum as the frequency is changed from low to high? 
Answer: 

c) 
What is the source frequency at the source current, IS, minimum? What do you call the frequency at that point? 
Answer: 

d) 
What do you notice from the values of the currents IC and IL at IS minimum? 
Answer: 

e) 
What is the phase relationship between IC and IL at IS minimum? 
Answer: 

f) 
What happens to the total impedance, ZP, of the parallel circuit at the current minimum? Choose the correct answer below: 
Answer: 

g) 
Why is the source current, IS, minimum at this frequency? 
Answer: 

III. A. 4. Parallel Resonance Circuit Resonance Frequency with Switch J1 Open:
New resonant frequency with the J1 switch OPEN = Hz.
III. A. 5. Questions on Parallel Resonance Circuit with Switch J1 Open:
a) 
What happened to the inductive branch of the circuit with the switch J1 OPEN? 
Answer: 

b) 
Did the resonance frequency go UP or DOWN compared with the previous result? 
Answer: 

c) 
Calculate the Quality Factor, Q of the inductor at this resonance frequency. 
Answer:


III. B. 1. Series Resonance Circuit Simulation:
Frequency, Hz 
IS (RMS), mA 
IC (RMS), mA 
IL (RMS), mA 
200 



300 



500 



700 



730 



734 



738 



800 



1000 



1200 



1400 



III. B. 2. Series Resonance Circuit Plot:
III. B. 3. Questions on Series Resonance Circuit:
a) 
What happens to the source current, IS, as the frequency is changed from low to high? Describe in your own words. 
Answer: 

b) 
What is the source frequency at the source current, IS, maximum? What do you call the frequency at that point? 
Answer: 

c) 
What do you notice from the values of the voltages VC and VL at IS maximum? 
Answer: 

d) 
What is the phase relationship between VC and VL at IS maximum? 
Answer: 

e) 
What happens to the total impedance, ZS, of the series L and C part of the circuit at this current maximum? Choose the correct answer below: 
Answer: 

f) 
Why is the source current, IS, maximum at this frequency? 
Answer: 

III. C. 3. Resonance Circuit Measurement:
a) 
What happens to the source current, IS, as the frequency is changed from low to high? Describe in your own words. 
Answer: 

b) 
What is the source frequency at the source current, IS, maximum? What do you call the frequency at that point? 
Answer: 

c) 
What do you notice from the values of the voltages VC and VL at IS maximum? 
Answer: 

d) 
What is the phase relationship between VC and VL at IS maximum? 
Answer: 

e) 
What happens to the total impedance, ZS, of the series L and C part of the circuit at this current maximum? Choose the correct answer below: 
Answer: 

f) 
Why is the source current, IS, maximum at this frequency? 
Answer: 

III. C. 4. Value Matches Simulated Values:
Match? Yes _____ No ______
III. C. 5. Any Mismatches Explained:
Grade:
Deliverable 
Points Available 
Points Achieved 
Laboratory Cover Sheet 
8 

Working Circuit(s)/Program(s) 
8 

Observations/Measurements 
6 

Questions 
8 

Total Points 
30 



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 Submitted On 19 Feb, 2015 12:55:57
 HomeworkExp
 Rating : 26
 Grade : A+
 Questions : 0
 Solutions :293
 Blog : 1
 Earned : $10409.80