uw-labview/week7 — pull request #10 by jamisk (2014-12-06 04:16:03+00:00)
Title: week 7 finished for grading

We finished and submitting a pull request to grade.
Questions:
1.) We found that a smaller pulse width of 100u works best of the 3. As the pulse width is widened, we saw in the FFT plot that some of the frequencies became suppressed. For the 10ms width, a lot of the frequencies were suppressed and we saw fewer good peaks.
2.) The effect of changing the acquisition rate changes how many samples we get and how many frequencies we get in the FFT. For 1000 rate, we get very poor results. For 10000 we found good results. For 100000 we had too many frequencies, much more than we needed (up to 10000 Hz), so we stuck with the 10000 which gave us about 5000 Hz range. For a frequency of 2000 Hz, we need a sample size double that, so we set rate to 4000 samples per second. This is because N samples can describe a frequency that is half the samples.
3.) We turned the gain way down until we could barely make out the response with 1 average. We then set the averages to 20 and we noticed with averaging we got data that seemed much more reasonable, i.e. less noisy.

We have included all of our data runs so they may be inspected if desired.