Download Diode Rectifiers

Student Name __________________________
Diode Rectifiers
D
VAC
R
CH1
CH2
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: