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

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The difference in the calculated time verses the cursor is that it's a little lower.  The calculated is more accurate than the cursor.
The difference in the calculated time verses the cursor is that it's a little lower.  The calculated is more accurate than the cursor.


[Franco's Oscilloscope| '''Lab Summary''']
[[Franco's Oscilloscope| '''Lab Summary''']]
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'''Links'''
'''Links'''

Revision as of 14:39, 13 September 2008

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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 on 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. Instead of a round graph, I changed it to square. I adjusted the screen. Then, I measured the fall and rise times by using the measure button, an equation on Wikipedia, and with the cursor button:


I only measured the rise time by the measure button:

  • Rise time: 32.5 micro sec.


The RC constant implies that the time is proportional to the resistance and the capacitance.


The difference in the calculated time verses the cursor is that it's a little lower. The calculated is more accurate than the cursor.

Lab Summary

Links


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