Electronics I - Laboratory 1 Diode I/V Characteristics

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1 Electronics I - Laboratory 1 Diode I/V Characteristics I. Objectives 1. Develop I/V characteristics of a silicon diode. 2. Develop I/V characteristics of a germanium diode. 3. Develop I/V characteristics of a light emitting diode (LED). 4. Utilize a current limiting resistor to power a LED from a voltage source. II. Pre-Lab Requirements 1. None III. Laboratory Requirements 1. Required Parts and Equipment A. DC power supply. B. One bench DMM C. 2 - Fluke hand-held DMMs D. 1 - Proto-Board (PB-103) E. 1 1N4148 silicon diode F. 1-1N34A germanium diode G. 1- Red LED H. Resistors of the following values: # Value Ω Ω I. Wires and leads for circuit connections. 2. Required Information A. Diode Pin Out Orientation The diodes used for this experiment and their respective pin-out orientations are shown in Figure 1 below. Generally diodes are marked with a colored band that denotes the negative pin. For LEDs the pins are usually different lengths with the short pin being negative; however, on the LEDs that you will be using the pins are the same length. The negative pin on the LEDs is connected to the larger internal structure. 1 of 5

2 Figure 1. Diode I/V Test Circuit B. Diode Data Sheets The diode data sheets may be found at the following web sites: IN IN34A Laboratory Procedure A. Silicon Diode I/V Characteristics In Experiment 1, a 1N4148 silicon diode will be tested to produce voltage and current data that will be used to plot the I/V characteristic curve of the diode. To produce the data, a test circuit will be constructed using the PB-103 Proto-Board. The test circuit will be powered by a DC power supply. Test equipment (TE) consisting of DMMs will be used to measure the following parameters: Voltage drop across the diode (V d ) Current through the diode (I d ). Experiment 1 Measuring the I/V Characteristics of a Silicon Diode. 2 of 5

3 Figure 2. Diode I/V Test Circuit 2. Take data samples between V d = -2V and V d = 1V. Collect 4 evenly spaced samples between -2V and 0V and 10 evenly spaced samples between 0V and 1 V. Make sure you do not exceed the wattage rating for the diode B. Germanium Diode I/V Characteristics In Experiment 2, a 1N34A germanium diode will be tested to produce voltage and current data that will be used to plot the I/V characteristic curve of the diode. To produce the data, a test circuit will be constructed using the PB-103 Proto-Board. The test circuit will be powered by a DC power supply. Test equipment (TE) consisting of DMMs will be used to measure the following parameters: Voltage drop across the diode (V d ) Current through the diode (I d ). Experiment 2 Measuring the I/V Characteristics of a Germanium Diode. 2. Take data samples between V d = -2V and V d = 0.75V. Collect 4 evenly spaced samples between -2V and 0V and 10 evenly spaced samples between 0V and 0.75 V. Make sure you do not exceed the current rating for the diode. B. Light Emitting Diode I/V Characteristics In Experiment 3, a LED will be tested to produce voltage and current data that will be used to plot the I/V characteristic curve of the LED. To produce the data, a test circuit will be constructed using the PB-103 Proto-Board. The test circuit will be powered by a DC power supply. Test equipment (TE) consisting of DMMs will be used to measure the following parameters: Voltage drop across the LED (V d ) Current through the LED (I d ). 3 of 5

4 Experiment 3 Measuring the I/V Characteristics of a LED. 2. Take data samples between V d = -2V and V d = 1.8V. Collect 4 evenly spaced samples between -2V and 0V and 10 evenly spaced samples between 0V and 1.8 V. Make sure you do not exceed the wattage rating for the diode. Also, make sure you note when the LED begins to illuminate. 4. Data Reduction and Lab Report This Lab submittal will be an informal report. Your report should be in Word with graphics pasted in. The items listed below are the minimum that should be included in your report. A. Experiment 1 Data: Measuring the I/V Characteristics of a Silicon Diode 2. A table showing the measured values V in, V d, I d, and computed power being dissipated by the diode (W d ). Make sure all graph axes are labeled properly and the graph has a proper title. c. What is the purpose of the resistor (R s ) in series with the diode? d. What is the most current that could flow through the diode in the test circuit if V in was set at 30V? A. Experiment 2 Data: Measuring the I/V Characteristics of a Germanium Diode 2. A table showing the measured values V in, V d, I d, and computed power being dissipated by the diode (W d ). Make sure all graph axes are labeled properly and the graph has a proper title. c. What is the most current that could flow through the diode in the test circuit if V in was set at 30V? 4 of 5

5 A. Experiment 3 Data: Measuring the I/V Characteristics of a LED 2. A table showing the measured values V in, V d, I d, computed power being dissipated by the diode (W d ) and values when the LED illuminates. Show the region where the LED produces light. Make sure all graph axes are labeled properly and the graph has a proper title. c. At what value of current does the LED commence illumination? 5 of 5

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