ET210 Lab 2_S2023

docx

School

CUNY Queensborough Community College *

*We aren’t endorsed by this school

Course

210

Subject

Electrical Engineering

Date

Jan 9, 2024

Type

docx

Pages

Uploaded by EarlBookSeaUrchin15

ET 210 Lab 2: Silicon Diode Characteristics Familiarize yourself with the lab, including the report instructions at the end, before beginning work. Objectives: 1) Learn how to identify diode polarity and test a diode with a multimeter. 2) Evaluate forward- and reverse-biased behavior of a diode. 3) Determine static (DC) resistance and knee voltage of a diode. Equipment and Material Required: DMM with Diode Test capability Manufacturer _________________ Model # __________ DC Power Supply (0 to 20 Volts) 1 1N400x diode ( x can be any number 1 through 7) 1 470 Ohm resistor 1 4.7k Ohm resistor 1 2.2MOhm resistor PART 1 Testing a diode with a DMM a. Using the Diode Test setting i. Select the Diode Test setting on the DMM. ii. Connect the the diode in the Forward-Biased condition: + (red) DMM lead to the anode lead, and –(black) DMM lead to the cathode lead (indicated by the stripe around the diode body) iii. The DMM will indicate a voltage reading. Record this reading in Table 1. iv. Reverse the DMM leads to put the diode in the Reverse-biased condition. Observe the DMM display. Record what the display shows in Table 1. b. Using the Resistance setting i. Select the select the lowest-range resistance setting on the DMM. ii. Connect the the diode in the Forward-Biased condition: + (red) DMM lead to the anode lead, and –(black) DMM lead to the cathode lead (indicated by the stripe around the diode body) iii. The DMM will indicate a resistance reading. Record this reading in the appropriate column of Table 1. iv. Reverse the DMM leads to put the diode in the Reverse-biased condition. The DMM will indicate a resistance reading. Record this reading in the appropriate column of Table 1. Note that, depending on the characteristics of the DMM, the resistance test may give unstable, or possibly indeterminate, results. If this is the case, and you may be unable to obtain a good reading. If so, make a note of that in the table.

ET 210 Lab 2: Silicon Diode Characteristics Familiarize yourself with the lab, including the report instructions at the end, before beginning work. c. Using the Diode Test setting i. Select the select the diode test setting on the DMM. ii. Connect the the diode in the Forward-Biased condition: + (red) DMM lead to the anode lead, and –(black) DMM lead to the cathode lead (indicated by the stripe around the diode body) iii. The DMM should indicate a voltage reading. Record this reading in the appropriate column of Table 1. iv. Reverse the DMM leads to put the diode in the Reverse-biased condition. The DMM should display a reading of “open”. Record this reading in the appropriate column of Table 1. Table 1 Diode Test Test Condition Results Diode Test Resistance Test Fwd Bias Rev Bias

ET 210 Lab 2: Silicon Diode Characteristics Familiarize yourself with the lab, including the report instructions at the end, before beginning work. PART 2 Forward-Biased Diode Characteristics a. Construct the circuit shown in Figure 1. Use the 470 Ohm resistor. Measure the exact resistor value with the DMM and record it here: Rmeas= ____________ Note that the DMM (Vd) will be used to measure the diode voltage and the resistor voltage. b. Starting at zero volts, adjust the Power Supply to obtain the resistor voltages (Vr) shown in Table 2. For each setting of Vr, measure Vd and record the value in Table 2. Note that you are adjusting the Power Supply while monitoring the voltage across the resistor (Vr), not the voltage from the Power Supply. c. For each combination of Vr and Vd in Table 2, calculate the current through the diode (Id) and enter in into Table 2. Use the measured resistance value of the resistor for the current calculations. d. Remove the 470 Ohm resisitor and replace it with the 1kOhm resistor. e. Repeat steps a, b, and c with the 1kOhm resistor and enter the data in Table 3. f. Using Excel, generate a graph of Id vs. Vd as shown in Figure 2 for each resistor value. Plot both sets of data on the same graph. Do not plot the data on Figure 2. Generate a graph in Excel and insert it into the report where required by the instructions shown at the end of the lab. Figure 1. 470 Ohm

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

ET 210 Lab 2: Silicon Diode Characteristics Familiarize yourself with the lab, including the report instructions at the end, before beginning work. Table 2. Forward-Biased Diode Characteristics with 470 Ohm Resistor Vr (volts) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Vd (volts Id = Vr/Rmeas Vr (volts) 1 2 3 4 5 6 7 8 9 10 Vd (volts Id = Vr/Rmeas Table 3. Forward-Biased Diode Characteristics with 4.7k Ohm Resistor Vr (volts) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Vd (volts Id = Vr/Rmeas Vr (volts) 1 2 3 4 5 6 7 8 9 10 Vd (volts Id = Vr/Rmeas

ET 210 Lab 2: Silicon Diode Characteristics Familiarize yourself with the lab, including the report instructions at the end, before beginning work. Figure 2. Sample graph format. PART 3 Reverse-Biased Diode Characteristics a. Construct the circuit shown in Figure 31. Use the 2.2MOhm resistor. Measure the exact resistor value with the DMM and record it here: Rmeas= ____________ Note that the DMM (Vd) will be used to measure the diode voltage and the resistor voltage. b. Set the Power Supply to 20 Volts. c. Measure the voltage across the diode and the resistor. Record the results in Table 4. Note that the voltage across the resistor may be very low. If you are unable to obtain a measurement with the DMM, try using the oscilloscope with the x10 probe setting. d. Calculate the theoretical value of Vd and enter it in Table 4. Apply KVL to determine this.

ET 210 Lab 2: Silicon Diode Characteristics Familiarize yourself with the lab, including the report instructions at the end, before beginning work. e. Enter the data in Table 4. Calculate the current using the measured resistance and voltage across the resistor. Table 4. Reverse-Biased Measurements Measured Resistance_______________ Power Supply Voltage Vr Vd (measured) Vd (calculated) I = Vr/Rmeas Questions for Part 1. Based on the results of the diode tests, how do you know if a diode is functioning properly? Based on the results of the diode tests (not the stripe on the diode body), how do you know which lead of the diode is the cathode and which is the anode? What would you conclude if the DMM gave the same results for both forward- and reverse- biased measurements? Questions for Part 1. 2.2MOhm Reverse the power supply leads. (-) to the resistor, (+) to the cathode of the diode. + -

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

ET 210 Lab 2: Silicon Diode Characteristics Familiarize yourself with the lab, including the report instructions at the end, before beginning work. Based on the results of the diode tests, how do you know if a diode is functioning properly? Based on the results of the diode tests (not the stripe on the diode body), how do you know which lead of the diode is the cathode and which is the anode? What would you conclude if the DMM gave the same results for both forward- and reverse- biased measurements? Questions for Part 2. Calculate the static resistance of the diode for Vr voltages of 1, 5 and 10 Volts. Do this for Tables 2 and 3. Enter the results in Table 5. Table 5. Diode Static Resistance Diode Static Resistance R = 470 Ohms R = 1kOhm Vr 1 V 5 V 10 V 1 V 5 V 10 V Rdiode Look up the definition of “knee voltage” of a diode. Based on the graph generated from Tables 2 and 3, what is the knee voltage of the diode used in this experiment?

ET 210 Lab 2: Silicon Diode Characteristics Familiarize yourself with the lab, including the report instructions at the end, before beginning work. Insert the graph generated in Part 2f on this page. Size the graph to take up at least half the page.

ET 210 Lab 2: Silicon Diode Characteristics Familiarize yourself with the lab, including the report instructions at the end, before beginning work. Questions for Part 3. Calculate the static resistance of the diode for the two values of Vd (measured and calculated) in Table 4. Enter the results in Table 6. Table 6. Diode Static Resistance using Vd (measured) using Vd (calculated) Rdiode What characteristic of the diode is being measured in this part? (hint-look up the data sheet for the diode to help answer this question.)

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

ET 210 Lab 2: Silicon Diode Characteristics Familiarize yourself with the lab, including the report instructions at the end, before beginning work. INSTRUCTIONS FOR THE REPORT Cover Sheet: All Lab reports must have a cover sheet containing the following information: Title of the experiment Experiment number as shown on the lab instruction sheet Student’s name Course Number Instructor’s name Date(s) conducted Date submitted Conclusion: All reports require a conclusion. One-half page is sufficient. Describe, in your own words, if the experimental results support the theory. Describe what was (or was not) proven, and generally what you learned from the experiment. The conclusion must be on it’s own separate page. Formatting: The lab instructions are pre-formatted. Completing the report requires data to be entered and questions answered where indicated. Do not delete any questions or instructions. Generate the report in MS Word, and save it as a Word file or PDF file. Upload the report to Blackboard in the Assignments section for this course. Questions for Part 3.