# Lab 13: Diodes

## Strongly Recommended Post-Lab Activity

Because lab 13 is short, and lab 14 is long, it is strongly recommended that you complete the following activity at the conclusion of lab 13:

- Download the data sets for each mystery box (posted on Blackboard) to open in LoggerPro.
- After opening the file(s) in LoggerPro, select the data set, then click on the button for curve fit. Select cosine A*cos(Bt+C)+D, then click on Try Fit, then click on OK. Complete these two steps for both the voltage and the current graph.
- Read the data from the curve equation off of the graph. This will provide you with the amplitude and phase of each wave. Convert the phase from radians to degrees. Record the current and voltage in your updated version of lab 14. (It will be different than what’s in the lab manual.)
- Now that you know voltage and current, you can calculate the impedance; the resistance is the real part and either inductance or capacitance can be calculated from the imaginary part. Record this in lab 14.
- Use the inventory of parts to determine which of the component values (resistor / capacitor / inductor) was likely used. You can assume the parasitic resistance of any inductor is approximately 50 Ohms.
- To save time before lab 14, you may want to calculate the compensation circuit required to increase the power factor of the circuit to one.
- Complete the previous steps for both mystery boxes.

## Resources

Watch/read the following resources prior to attending this lab. This information will teach you how to use lab equipment and provide suggestions and technical tips for successfully completing the lab.

- Video: Breadboard
- Video: DC power supply
- Video: Function generator
- Video: Oscilloscope
- Video: Oscilloscope triggering
- Video: Tabletop multimeter
- Website: Digi-Key 4-band resistor color code calculator
- Infographic: Wiring a potentiometer vs. wiring a variable resistor
- Infographic: Using a potentiometer as a variable resistor
- Infographic: Connecting common circuit components to a breadboard
- Infographic: Using equipment with Earth ground

This lab is licensed under creative commons as CC-BY-SA-NC. For more information, visit creativecommons.org.