Equipment:
You must make up a complete equipment list and have your instructor review it before you start.

Components:
C1  1000 pF
L1  470 uH
R1  3000 Ohm

References:
RC and RL Circuits - Your textbook Ch. 7 page 299.
The XYZs of using a Scope
TDS 460A Digital Oscilloscope Manual
HP 8116A Pulse/Function Generator Manual
Fluke PM 6304 Programmable Automatic RCL Meter (obtained from Rm. 304)

Objectives:

• Determine and measure RC and RL time constants
• Use the TDS 460A (digital oscilloscope) to make voltage and time measurements
• Use HP8116A as a square wave source
• Use Fluke PM6304 to measure capacitance
• Use Fluke PM6304 to measure inductance
• Use the color code on inductor to obtain nominal values

Design, Build and test a RC circuit
 
 
 

Use the following specifications on Figure #1 and

C1 0.001 uF
R1 3000 Ohm
Vs 10.0 Vpp
     TYPE = SQUARE WAVE
     FREQUENCY =  20 kHz
    OFFSET = 0

1. Establish the general equation for Vout in term of initial voltage (Vo), time (t), R1 and C1.  Call it "Equation #1".
2. Simulate the circuit of Figure #1 using ORCAD and plot the graph of Vout vs. time using transient analysis for time starting at 0 to 50 micro seconds.  Label the graph "Graph #1A - Simulated Vout/Vs vs time".  In the ORCAD, use VPULSE as the Vs and set V1=5V, V2=-5V, TD=0, TR=0, TF=0, PER=1/FREQUENCY and PW=0.5*PER.
3. Calculate time constant ,t for Figure #1.
4. Use Equation #1 to find Vout for t, 2t, 3t, 4t and 5t for one complete cycle of Vs.  Place this information in Data Table #1A.  Use the data to plot Vout vs t. Label the graph"Graph #1B - Calculated Vout vs t".

1. Construct the circuit of  Figure #1.
2. Store and print the graph of Vout/Vs vs. time from the digital oscilloscope.  Use a software called  "Wavestar" available in Room 301 computer  to do this.  Label this graph "Graph 2 - Measured Vout/Vs vs. time".
3. Use the digital oscilloscope and find Vout for 1t, 2t, 3t, 4t and 5t.  Place this information in Data Table #2.

Use the following specifications on Figure #2 and :
L1  10 mH
R1 3000 Ohm
Vs 10.0 Vpp
     TYPE = SQUARE WAVE
     FREQUENCY =  20 kHz
     OFFSET = 0

                                        Figure #2
 
 

1. Establish the general equation for Vout in term of initial voltage (Vo), time (t), R1 and L1.  Call it "Equation #2".
2. Simulate the circuit of Figure #2 using ORCAD and plot the graph of Vout vs. time using transient analysis for time starting at 0 to 50 micro seconds.  Label the graph "Graph #3A - Simulated Vout/Vs vs. time".  In the ORCAD, use VPULSE as the Vs and set V1=5V, V2=-5V, TD=0, TR=0, TF=0, PER=1/FREQUENCY and PW=0.5*PER.
3. Calculate time constant ,t for Figure #2.
4. Use Equation #2 to find Vout for t, 2t, 3t, 4t and 5t for one complete cycle of Vs.  Place this information in Data Table #3A.  Use the data to plot Vout vs t. Label the graph"Graph #3B - Calculated Vout vs t"

4. - RL Circuit - Verification

1. Construct the circuit of  Figure #2.
2. Store and print the graph of Vout/Vs vs. time from the digital oscilloscope.  Use a software called  "Wavestar" available in Room 301 computer  to do this.  Label this graph "Graph 4 - Measured Vout/Vs vs. time".
3. Use the digital oscilloscope and find Vout for 1t, 2t, 3t, 4t and 5t.  Place this information in Data Table #4.

5. - Design of RC Circuit

Design a series RC circuit that will cause the voltage drop across a resistor to go from 5V to 1V in 1.5 seconds.  Explain in detail your design.

Use the Lambda power supply as the source.  You can switch it on and off to test your circuit.  Store and print your result using digital oscilloscope.

Build, test and demonstrate this circuit to your instructor.

6.  Conclusions
     Compare the calculated data to your measured data.  Explain any and all differences.
 
The manuscript was converted to HTML format by Faisal Mohd Yasin, cepus@seas.gwu.edu, November 2001.
Original manuscript by John J. Petrella.