Previous Laboratory Experiment, Spring 2019

This project primarily gets the students comfortable with measurement and resulting analysis of resistive circuits. Part of this lab is that you get familiar with your tools, measuring data, and getting data to a place where you can analyze it and write it up. Remember plots and data analysis are done in MATLAB / Scilab; please don't include your code in your writeup. You will submit one writeup per group electronically to the professor (both individuals may submit the same report twice in Canvas if both names are on both documents).

Figure 1: Resistive divider circuit for lab measurement.

• Set a resistive voltage divider using components. Sweep the input voltage (V_in) from 0V to 3V or 5V taking roughly 100 points, and measure the output voltage (V_out). From your measured data, make a linear curve fit (e.g. MATLAB) to this data to find the ratio between R₁ and R₂ from this data. The curve fit will give the gain (which you should identify), the ratio of the output voltage to the input voltage. You might measure an offset voltage from the curve fit. Do you expect an offset theorectically? You should discuss what might be causing this value. Calculate the ideal value of this ratio and compare your results. After getting these results, measure the value of R₁ and R₂ using your data aquisition device or similar device if you have something available. Compare the resistance values with the indicated tolerances from the resistor codes, as well as compare the circuit gain and ratio of R₁ and R₂. You will want to give a percent deviation from ideal values whereever possible, as well as other relevant metrics.
• Older documentation and problem assignments . You don't have to complete any of these items explicitly, although they might be helpful for what is required by this assignment (e.g. resistor codes), as well as some documentation on completing these measurements. I would strongly recommend reading through this document before doing your lab.