lab2 - 98 ohm 2 R4 220 ohm 222 ohm 0.90 RL 100 ohm 105 ohm...

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2. Objective: To compare theoretical predictions of calculated quantities to EWB simulation results as well as with NI circuit board measurements. Illustrate that actual circuit board measurements (NI) differ from nominal values (calculated values). The differences in rated values of resistors are exploited. Percent error is calculated to display this exploitation. 3. Procedure: Using the DMM; we measured the actual value of the 5V power source. We then measured the actual values of resistors 1 through 4 as well as R L . Using only components with exact measured values, the circuit was built. Post build of the circuit; we used a DMM to measure I L , V L = V xy . R L was removed then V OC and I SC were measured with the DMM. The circuit board was left constructed and the calculations from part IB and IIA were recalculated using the measured values of all components. 4. Results A, B. NOMINAL MEASURED % ERROR R1 47 ohm 47 ohm 0% R2 47 ohm 47 ohm 0% R3 100 ohm
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Unformatted text preview: 98 ohm 2% R4 220 ohm 222 ohm 0.90% RL 100 ohm 105 ohm 5% VS 5V 4.89V 2.20% IL 10.8mA 10.4mA 3.70% CALCULATED MEASURED % ERROR VL 1.08V 1.04V 3.70% C. Measured: V OC = 1.38V I SC = 36.8mA D. Calculated I L = 32.4mA The results from each section I, II, and III (hand calculated, EWB, and measured) were equivalent for the most part (% error < 5%). The variation in measured values of the resistors and power source with respect to the nominal values caused the small error. 5. Conclusion: When you use the power supply on the Ni board, makes sure to measure its value. Do not assume the voltage is exactly 5 V. There are a variety of equivalent methods to solve circuits (NI board measurements, EWB, Hand calculation). Calculated and measured values have evident but small differences. Analysis of a complex circuit can be simplified by breaking it down into its Thevenin and Norton equivalents....
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