User:Manuel Franco Jr./Notebook/Physics Lab 307/2008/09/10

From OpenWetWare
Jump to navigationJump to search
Oscilloscope Lab <html><img src="/images/9/94/Report.png" border="0" /></html> Main project page
<html><img src="/images/c/c3/Resultset_previous.png" border="0" /></html>Previous entry<html>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</html>Next entry<html><img src="/images/5/5c/Resultset_next.png" border="0" /></html>

Oscilloscope Lab

For this lab, I became familiar with a digital oscilloscope. I plugged in the BNC cable from the oscilloscope to the function generator. Then, I created a sine graph with the screen. I then took some measurements:

Measuring Data

My first sine graph

  • Peak to peak : 1.60 V
  • (max to min): 780mV to -780mV
  • Freq.: 961.5 Hz
  • Period: 1.040 ms

Other Graphs

1.) Increased the volts:

  • Peak to peak : 4 V
  • (Max to Min 'based on cursor'): 2V to -2V
  • Freq.: 1.03 kHz
  • Period: 974 s---? micro

2.) Decreased volts (lowest voltage on the F.G.):

  • Peak to peak : 616 mV
  • (Max to Min 'based on cursor'): 304mV to -304mV
  • Freq.: 975.5 ?Hz micro
  • Period: 1.025 ms


Note: The function generator could be set at any voltage (voltage only determines amplitude). The frequency at which it's set is very essential. If the frequency is too low, you'll get a condensed off scale sine graph. If the frequency is too high, you will just see a line, or half a sine graph. So I adjusted the frequency according, not too high or too low.


Taking Measurements:

1.) Measure Button - Gives data automatically.

2.) The Grid - Using the boxes on the grid, you can determine voltages and times.

3.) Cursor Button - Set cursors, determine measurements.

Triggering

Triggering enables the user to move along back and forth in the times of the wave.

  • Options on oscilloscope: pulse, video, edge.
    • Edge holds the wave.
    • Pulse holds the wave or moves the wave, based on settings.
    • Video moves the wave based on rise or fall.
  • Rise and Fall
    • Rise oscillates the wave to the right (Increasing).
    • Fall oscillates the wave to the left (Decreasing).

AC Coupling

I applied a large DC voltage of 12V (as instructed),and I decreased the frequency on the function generator substantially down to about 1 X 2.0 Hz.

I measured the fall and rise times by using the measure button, an equation on Wikipedia, and with the cursor button:

  • Fall time: 54.5 ms
  • Fall time cal.: 45.1 ms
  • Fall time w/ cursor: 49.6 ms

I only measured the rise time by the measure button:

  • Rise time: 32.5 micro sec.

http://upload.wikimedia.org/math/8/5/a/85aaa72e1300ac09649dd6a1e10cc85b.png

Notes for myself

  • I found out that the frequency i had it on was too low, and I could not get the sine graph. But i fixed it.
  • An increase in voltage increased the amplitude.
  • The frequency setting determines the period of the wave.
  • Increase in frequency decreases period.
  • Using the measuring button is handy, b/c it measures freq., period, mean, and many other things all depending on the voltage and the frequency set on the func. gen. It can also have several measurement on display.

My first sine graph

  • Peak to peak : 1.60 V
  • (max to min): 780mV to -780mV
  • Freq.: 961.5 Hz
  • Period: 1.040 ms

Other Graphs

1.) So in order to increase Amp. I increase the volts, and the data came out to be so:

  • Peak to peak : 4 V
  • (Max to Min 'based on cursor'): 2V to -2V
  • Freq.: 1.03 kHz
  • Period: 974 s---? micro

2.) Low amp. I decrease volts. 'lowest voltage on the func. gen.

  • Peak to peak : 616 mV
  • (Max to Min 'based on cursor'): 304mV to -304mV
  • Freq.: 975.5 ?Hz micro
  • Period: 1.025 ms

Triggering So the question is: 'Common way to trigger is on a rising edge (what does this mean?). What happens to the signal when you use different triggers? Be able to explain this orally.' So what I'm getting this is, based off of wiki and Mr. Young, that the trigger function is used to measure data on the table more precise. Starting at a starting point and to an ending point, such as at t=0 to t=10. Triggering enables the user to move along back and forth in those times of the wave.

There are different functions for triggering such as pulse/video/edge. Edge does what is said above. As for video it sets the wave in motion depending on if it is "rising" or "falling." Pulse is more of an unknown thing for me....

AC Coupling Thinking... So the instructions say to apply a large DC voltage I have about 12V. And I've decreased the frequency substantially down to about (X1 2.0 Hz)whatever that means? The comparison is that the DC keeps a max voltage most of the time, but for AC that's not the case. Once it hit's max voltage, it exponentiates downward to V=0. The answer to avoid ripples is edge mode, i guess.

Okay, so the increase in the DC voltage increases the amplitude, just as the Amplitude does.

Fall time: 54.5 ms Fall time cal.: 45.1 ms Fall time w/ cursor: 49.6 ms Rise time: 32.5 micro sec.

The difference in the cal. time to the cursor is that it's a little lower.



Retrieved from "https://openwetware.org/mediawiki/index.php?title=User:Manuel_Franco_Jr./Notebook/Physics_Lab_307/2008/09/10&oldid=242070"