DE4401 ELECTRICAL AND ELECTRONICS PRINCIPLES 1 APTE 5601 ELECTRICAL AND ELECTRONICS PRINCIPLES Lab 8 Diodes and Rectifiers Name: Student ID: Date: Supervisor Signature: OBJECTIVES You will connect several Diode and Rectifier circuits and make measurements and observations regarding their important electrical characteristics. In completing these projects, you will connect circuits, make measurements, perform calculations, draw conclusions, and be able to answer questions about the following items related to Diodes and Rectifiers: Basic Properties of Diodes Half Wave Rectifiers Full Wave Rectifiers SPECIAL NOTE: For this project, and all the following projects that require setting or measuring ac voltages (or currents), assume that the rms values are desired, unless specified otherwise. REQUIREMENTS For the following Projects you will need: Breadboard Multimeter Calculator NOTE MEASUREMENTS AND OBSERVATIONS CAN BE PERFORMED IN A GROUP, BUT CONCLUSIONS MUST BE INDIVIDUAL. 1 DIODE FORWARD AND REVERSE CHARACTERISTICS PROJECT PURPOSE To observe the properties of Diodes. PROCEDURE 1. Use a multimeter to measure the forward resistance and reverse resistance of a good power diode. 2. Use a multimeter to measure the forward resistance and reverse resistance of a faulty diode 3. Use a multimeter to measure the forward resistance and reverse resistance of a good small signal diode. Write your results in the Observation section below. OBSERVATION Good Power Diode Small Signal Diode 𝑅𝐹 = ___________________________ Ω. 𝑅𝐹 = ___________________________ Ω. 𝑅𝑅 = ___________________________ Ω. 𝑅𝑅 = ___________________________ Ω. 𝑉𝐹 = ___________________________ V. 𝑉𝐹 = ___________________________ V. 𝑉𝑅 = ___________________________ V. 𝑉𝑅 = ___________________________ V. Faulty Diode 𝑅𝐹 = ___________________________ Ω. 𝑅𝑅 = ___________________________ Ω. . CONCLUSION Explain the difference in forward and reverse characteristics for a good and a faulty power diode. ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………... RECTIFIER 4. Connect a half wave rectifier to a signal generator supplying 12 Vpp at 50 Hz. Observe and record the comparison of the input and output waveforms with an oscilloscope.. OBSERVATION Circuit: 2 5. Connect a 1000uF smoothing capacitor across the output, and record the output waveforms without and with a significant load. 6. Connect a full wave bridge rectifier to a signal generator supplying 12 Vpp at 50 Hz. Observe and record the comparison of the input and output waveforms with an oscilloscope OBSERVATION Circuit 7. Connect a 1000uF smoothing capacitor across the output, and record the output waveforms without and with a significant load OBSERVATION 3 8. Duplicate your circuits on Multisim and show your tutor your results. . OBSERVATION CONCLUSION . 4