lab report eet 2010

EET 2010 Lab Exercise #2 Electronics Principles

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

3. DMM

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. 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 subtract channel 2 from channel 1 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.

EET 2010 Lab Exercise #2 Electronics Principles

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 using measured quantities.

Submittal:

OBJECTIVE

DATA – must include but may not be limited to: Two circuits, six screenshots including

measured values, ripple factor calculations. (Nothing submitted should be hand-written)

DISCUSSION – at minimum, 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 size.