EGR 224/RC Lab

The following page provides some supplemental information for the RC Circuits and Filtering lab for EGR 224L. It has been updated for Spring, 2019.

Clarifications

If any of your figures looks wrong, it probably is! Be sure to have a TA check your figures so that you leave the lab with a valid data set.
Use MATLAB on the PC to do the data acquisition
For newer versions of MATLAB (2015 and after), the proper way to get out of a "keyboard" environment is to type the word "dbcont" and hit enter; the word "return" no longer works for that
For Maple, when you put in the sinusoid at 60 rad/s, Maple may try to be "helpful" and use double angle formula to come up with a result that is a complete mess; try a frequency of 60.01 rad/s instead. It's just about the same speed and Maple won't be...helpful...
The experimental phase values should track well at low frequencies but may fluctuate a bit at higher frequencies due to inaccuracies in determining peaks.

Element Values

Resistances:
- 1, 9, 17: 2.2 k $\Omega$
- 2, 3, 10, 11, 18, 19: 4.7 k $\Omega$
- 4, 5, 12, 13, 20, 21: 10 k $\Omega$
- 6, 14, 16, 22: 15 k $\Omega$
- 7, 8, 15, 23, 24: 22 k $\Omega$
Capacitances
- 7, 15, 23: 2.2 $\mu$ F
- 4, 6, 8, 12, 14, 16, 20, 22, 24: 4.7 $\mu$ F
- 2, 5, 10, 13, 18, 21: 10 $\mu$ F
- 1, 3, 9, 11, 17, 19: 22 $\mu$ F

Links

The MATLAB:Transfer Functions page should be very helpful here.
The files for this assignment can be downloaded from http://classes.pratt.duke.edu/FILES/EGR224/DAQS/RCfilter
See Transferring_Files for information on how to get the files to your CIFS space.

Wiring Images

Closeup of the breadboard
Closeup of the CB-68LP

Click on the pictures above to make them larger.

Voltage Images

Clean graphs indicating good wiring
Fuzzy graphs indicating wiring problems