lab report for Electronic Principle

EET 2010 Lab Exercise #2 Electronics Principles

Half and Full Wave Rectified Sine Waves

In this lab you will construct and measure the output of a half wave and a full wave rectifier and

the filtered output. In addition you will learn to use the Math function on the oscilloscope.

Equipment 1. Function Generator (FG)

2. Oscilloscope

Materials 1. (4) 1N4002 Diodes 2. 1k Ohm Resistor

3. 10uF and 100uF Capacitor

Procedure

1. Assemble the circuit shown above. Set the FG to provide V1 to the circuit

2. Once assembled, measure V1 with channel 1 of the oscilloscope and the voltage across

the resistor with channel 2. Measure and record the maximum and minimum voltages

of the rectified waveform. Save a screenshot (image of waveforms) including measured

values.

3. Shut off the FG, add a 10uF capacitor (filter) in parallel with the load. Measure and

record the peak-to-peak voltage of the ripple voltage. Save a screenshot including

measured values.

4. Replace the 10uF capacitor with the 100uF capacitor and repeat step 3. Save a

screenshot.

5. Calculate the ripple factor for each filter.

6. Do not turn on power until instructed to. Now, assemble the circuit in Figure 2-2.

Connect the grounds of the function generator and both scope probes to an earth

ground which is available as a metal post on the oscilloscope. Use channel 1 to measure

the voltage on node 3 and use channel 2 to measure the voltage on node 1. Ask the lab

instructor to verify the circuit and probes before applying power to it. Once the circuit is

approved, apply power from the FG. Use the math function on the oscilloscope to

V1 2.5Vpk

250Hz 0°

D1

R1 1kΩ

Figure 2- 1

Figure 2- 3 Figure 2- 2

EET 2010 Lab Exercise #2 Electronics Principles

subtract channel 1 from channel 2 to get the output waveform as seen by the resistor.

Measure and record the maximum and minimum voltages of the rectified (Math)

waveform. Save a screenshot including measured values.

7. Add the 10uF capacitor to the circuit across R1 again. Note how the shape of the wave

looks and measure and record the peak-to-peak voltage of the ripple voltage. Save a

screenshot including measured values.

8. Replace the 10uf capacitor with the 100uF capacitor and repeat step 7. Save a

screenshot.

9. Calculate the ripple factor for each filter.

BONUS: Remove the load (and the filter(s)) from the circuit and repeat step 6. What

happened to the rectified voltage waveform and why?

Submittal:

Data section will include two circuits, six screenshots including measured values, four ripple

factor calculations. (Nothing submitted should be hand-written)

DISCUSSION - include discussion about the shapes of the waveforms for each variation of the

circuit that was mentioned in the lab with respect to the corresponding theoretical material

discussed in lecture. Discuss what the circuit does and also discuss the importance of the

capacitor.

BONUS: Include observations and explanations in paragraph form, regarding BONUS section

instructions above.