User:Cristhian Carrillo/Notebook/Physics 307L/

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Oscilloscope

Oscilloscope Lab

SJK 10:58, 29 September 2010 (EDT)
10:58, 29 September 2010 (EDT)
There are some good parts of this primary notebook and some things missing. The photo of the setup is good. In general, there is not enough information recorded to reproduce the work. The o-scope lab is very exploratory, so it's tough to take good notes. Make sure for future labs that you record more information, keeping in mind what would be needed to replicate the work some time later.
  • The purpose of this lab is to learn how to use an oscilloscope and a function generator.

Materials Needed

  • Oscilloscope
  • Function Generator
  • BNC Cable

Setting Up

SJK 10:36, 29 September 2010 (EDT)
10:36, 29 September 2010 (EDT)
Good that you included the model number for the oscilloscope. Missing for the function generator, I think.

I got an oscilloscope called Tektronix TDS 1002 and a function generator called wavetek. I got a BNC cable to connect the generators output to channel one of the ocilloscope. The output that I used for the wavetek generator is called 2vp-p. I then adjusted the frequency to 200Hz in the generator.

Measuring the Sine Wave

SJK 10:38, 29 September 2010 (EDT)
10:38, 29 September 2010 (EDT)
This seems unlikely that you could measure frequency so precisely by eye. Probably just a typo from getting used to the o-scope.

1) Counting Grid Lines

 peak-peak voltage=6.01V, frequency=203.7Hz

2) Using Cursors

 peak-peak voltage=6.00V, frequency=204.1Hz

3) Using Measure

 peak-peak voltage=6.08V, frequency=203.7Hz
  • Counting grid lines to measure the voltages and frequencies was not too difficult but it was not very accurate for me. The cursors were easier to get better values. When I finally used the measure option I found that the actual values were close to the values I measured using the cursors.

Triggering

I learned from Zane's lab book that "Triggering on a rising edge means that the graph stops according to when the graph reaches a rising voltage."

AC Coupling

 Fall time=122.0ms with cursors, and 117.8 with measure
I had a hard time with understanding what AC coupling was and I had Katie help me with understanding what the difference is between AC and DC coupling. Unfortunately, I did not have enough time to get an accurate measurement of the fall time. Therefore, I do not believe that my tao constant will be correct SJK 10:54, 29 September 2010 (EDT)
10:54, 29 September 2010 (EDT)
Yup, it looks like your fall time measurements are not correct. That's OK for this lab.

The RC constant R*C=tao which was supposed to be equal to the falltime. I did not have enough time to get really comfortable with the AC coupling, therefore I did not get a very good value of the fall time. See the value above.