EEE 202 Lab 1 Data Sheet Filled

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Arizona State University *

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202

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Electrical Engineering

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Feb 20, 2024

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Name: William Tyler Dodson EEE 202 Lab 1: Data Sheet LTspice, Basic Circuitry, and Measurement Part 1: Building a Basic Circuit Build this circuit in LTspice and run a DC simulation: The first time you ran this simulation, did you get any errors? What were they? How did you correct them? No errors. From a technician’s view, I see no reason for there to be any errors with this circuit. Why use software like LTspice to simulate a circuit before physically building it? To verify that the circuit will operate, without errors. Also, to not build it first with a mistake, that will cause a catastrophic failure. Simulation Results: Run a DC Operating Point (.op) simulation and record the results Node 001 Voltage = 5V Current Across R1 = -0.005A 1

Schematics: Label and attach the LTspice schematic of your circuit to the lab data sheet. Be sure to rename the node something different than N001. Part 2: DC Sweep Build this circuit in LTspice and run a DC Sweep simulation: Draw Plots: Sweep the DC supply voltage linearly from 0V to 9V in steps of 1V. (.dc) DC Sweep of Voltages (V(n1), V(n2), V(N1, N2)) DC Sweep of Power Dissipated in R1 2

Does the static value of the DC supply impact the output of the DC sweep? Why or why not? No. Because the software reads it as a variable supply for the measurements on sweep, and uses the desired start, stop, and increment values to determine what voltage the source is putting out. If you sum the power dissipated by resistor 1 and the power dissipated by resistor 2, how does that total sum compare to the power supplied by the voltage source? Why? The sum of power dissipated by R1 and R2 will be the inverse of the power supplied by the source. Because this is a closed system, so no power is leaving the system. Schematics: Label and attach here a screenshot of the LTspice schematic of your circuit to the lab data sheet. Be sure to label your nodes: Part 3: Voltage Divider Build this circuit in LTspice and run a DC simulation (.op) using the three values for R2 noted below: 3

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Using the following values of R2, find the voltage drop across R2 in your LTspice simulation and then use the multimeter to measure the voltage across R2 in your physical circuit. Resistor (R2) value Simulated Results (with R3) Measured Results (no R3) 5k  Voltage Across R2= 0.96 Voltage Across R2 = 1.00 20k  Voltage Across R2= 2.272 Voltage Across R2 = 2.5 100k  Voltage Across R2= 3.57 Voltage Across R2 = 4.16 In the simulation, R3 depicts a multimeter with a low input resistance. Explain why low input resistance is not ideal. Since the meter is in parallel with the component in question. We are creating a new path around the resistor with our meter. We need the resistance to be very high, so most of the current will take the path through the component, not the meter. 4 Include this resistor in your simulation, but it represents a low resistance multimeter, so don’t include it in your actual physical measurements.

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