# Diode Rectifiers

Document Sample

```					Student Name __________________________

Diode Rectifiers

D
CH1 CH2

VAC

R

Equipment:
An AC signal generator - VAC An Oscilloscope Leads A 1N4001 rectifier diode A 2.2 kΩ resistor

Procedure:
1. Connect the components as shown on the diagram above. Initially it is sufficient to connect only channel 1 of the oscilloscope. 2. Adjust the signal generator to produce a 5 volt rms sine wave output at a frequency of 500 Hz. You can check the rms output voltage from the signal generator using a DMM. 3. Adjust the oscilloscope to obtain a stable display of the CH1 voltage waveform and sketch this to scale on the results sheet. 4. Use the oscilloscope display to measure the peak amplitude and the period of the signal generator output voltage. Convert the peak voltage value to rms and compare the measurements with the expected values of voltage and time. Do you think that the oscilloscope voltage measurement is better or worse than that from the DMM? Explain. 5. Use the measured value for the period of the waveform to calculate the frequency of the signal generator output. 6. Set the oscilloscope to display the CH2 voltage waveform and sketch this to scale on the results sheet. 7. Explain why the voltage measured across resistor R is said to be half wave rectified. 8. Measure the difference between the positive peak voltage on CH2 and that on CH1. Explain the difference.

Student Name __________________________ 9. Disconnect the diode D and instead connect the bridge rectifier module between VAC and R. 10. Measure and sketch the new voltage waveform across R to scale. Comment on the peak value of the new voltage waveform. 11. Suggest a reason why the bridge rectifier output voltage might be considered an improvement on the output from the half wave rectifier.

Student Name __________________________ Step 3 Voltage Waveforms:

CH1 Volts per Division ___________ CH2 Volts per Division ___________ Time per Division
Step 4: Peak Amplitude __________________________________ Period __________________________________________ RMS Amplitude __________________________________

___________

Student Name __________________________

Step 5: Frequency = 1/Period = __________________________________________ Step 6:

CH1 Volts per Division ___________ CH2 Volts per Division ___________ Time per Division ___________

Student Name __________________________ Step 7:

Step 8: Voltage difference = ________________________

Step 10:

CH1 Volts per Division ___________ CH2 Volts per Division ___________ Time per Division ___________

Student Name __________________________ Comment:

Step 11:

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