# Lab8_Diodes and Rectifiers

```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:
 Multimeter
 Calculator
NOTE MEASUREMENTS AND OBSERVATIONS CAN BE PERFORMED IN A GROUP,
BUT CONCLUSIONS MUST BE INDIVIDUAL.
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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.
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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:
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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
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