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Lab Report: Applying Thevenin's Theorem to a Series-Parallel Circuit - Prof. Ali Khabari, Lab Reports of Microelectronic Circuits

A lab report for a university course on circuit theory ii (elec195). The report details an experiment where thevenin's theorem is used to calculate the load voltage and load current for a given series-parallel circuit. A schematic, required equations, and a procedure for constructing the circuit and measuring the necessary parameters. The results are then verified using pspice simulation.

Typology: Lab Reports

Pre 2010

Uploaded on 08/18/2009

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ELEC195 LAB #8 2/6/03 J. F. Santacroce
NAME:____________________________
ELEC195 CIRCUIT THEORY II
PARTNERS:________________________
________________________
DATE:_____________________________
LAB #8 THEVENIN’S THEOREM
OBJECTIVE:
To calculate the load voltage and load current using Thevenin’s Theorem.
To verify your results by using Pspice simulation to verify the load voltage and load
current for the circuit.
EQUIPMENT: PARTS & SUPPLIES
HP-33120A Function Generator
HP-54600 Oscilloscope
1 – 100 , ¼ W Resistor
1 – 220 , ¼ W Resistor
HP-34401A Multimeter 1 – 330 , ¼ W Resistor
1 - Analog Breadboard 2 – 0.1 uF, Capacitors
1 - CDA 3 Decade Capacitor Box 1 – 0.047 uF, Capacitor
1 - CDA 5 Decade Capacitor Box
1 – Resistor Decade Box
1 Sets Banana to Alligator Clip Leads
2 Sets BNC to Alligator Clip Leads
1 Set BNC to Alligator Clip Leads( Blue
Band).
DISCUSSION:
The series-parallel circuit shown in Figure #1 is to be analyzed using Thevenin’s
Theorem. During this experiment you will measure Thevenin’s equivalent circuit and
subsequently verify your results using Pspice.
Thevenin’s equivalent voltage directly measured as the open-circuit voltage with the load
capacitor, CL removed. Thevenin’s equivalent impedance will be calculated by first
measuring the following parameters; vOC (open-circuit voltage) and iSC (short-circuit
current) and then satisfying the equation given below:
ZTH = vOC / iSC
1
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NAME:____________________________

ELEC195 CIRCUIT THEORY II

PARTNERS:________________________

________________________

DATE:_____________________________

LAB #8 THEVENIN’S THEOREM

OBJECTIVE:

To calculate the load voltage and load current using Thevenin’s Theorem. To verify your results by using Pspice simulation to verify the load voltage and load current for the circuit. EQUIPMENT: PARTS & SUPPLIES HP-33120A Function Generator HP-54600 Oscilloscope 1 – 100 , ¼ W Resistor 1 – 220 , ¼ W Resistor HP-34401A Multimeter 1 – 330 , ¼ W Resistor 1 - Analog Breadboard 2 – 0.1 uF, Capacitors 1 - CDA 3 Decade Capacitor Box 1 – 0.047 uF, Capacitor 1 - CDA 5 Decade Capacitor Box 1 – Resistor Decade Box 1 Sets Banana to Alligator Clip Leads 2 Sets BNC to Alligator Clip Leads 1 Set BNC to Alligator Clip Leads( Blue Band). DISCUSSION: The series-parallel circuit shown in Figure #1 is to be analyzed using Thevenin’s Theorem. During this experiment you will measure Thevenin’s equivalent circuit and subsequently verify your results using Pspice. Thevenin’s equivalent voltage directly measured as the open-circuit voltage with the load capacitor, CL removed. Thevenin’s equivalent impedance will be calculated by first measuring the following parameters; vOC (open-circuit voltage) and iSC (short-circuit current) and then satisfying the equation given below: ZTH = vOC / iSC

SCHEMATIC:

Figure # REQUIRED EQUATIONS: ZTH = vOC / iSC Z 1 = R1 + jXC Z 2 = R2 + jXC Z 3 = R ZL = CL PROCEDURE:

  1. Construct the circuit shown in Figure #1. Set the HP-33120A Function Generator to a 5VRMS (sine wave) with the frequency at 16kHZ. Measure the required circuit parameters, in polar form, as required in the following table. e = _________________ (polar form) vL = _________________ (polar form) iL = _________________ (polar form) VOC = _______________ (polar form) iSC = _________________ (polar form)
  2. Construct Thevenin’s Equivalent circuit using both the Decade Resistor Box and the Decade Capacitor Box and measure: vL = _________________ (polar form) iL = _________________ (polar form)
  1. Using the techniques of Part 1, find Thevenin’s equivalent voltage. This is the open- circuit voltage and don’t forget the 100Meg- resistor to ground.
  2. Find Thevenin’s equivalent impedance using the relationship: ZTH = vOC / iSC. Therefore, find iSC by using Pspice and placing a short-circuit across the output. This is accomplished by using IPRINT as the short!
  3. Build up Thevenin’s circuit by using the real part of ZTH as RTH and the imaginary part as XTH , the reactance of CTH. Calculate the capacitor value from this reactance! Put the 0.047uF capacitor back as the load and simulate the output voltage.
  4. Compare the simulated results with the measured results.