User:Johnny Joe Gonzalez/Notebook/Physics 307L/2009/09/02

Oscilloscope

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SJK 20:22, 13 September 2009 (EDT) 20:22, 13 September 2009 (EDT) Overall Comments: Good job during this lab, Johnny, I think you learned a lot and were understanding things when I talked with you. This is a very good start on your lab notebook and your lab summary. This page is considered your "primary lab notebook" and it's where you should record as much information as possible. The other page, the "lab summary" is what you write after you've done the lab and thought about your results. It should be stand-alone so an interested reader could understand what you did and only need to refer to this page (your primary lab notebook) if they want more detailed information. So, one of the biggest things you need to improve on next time is to make sure you have these two things more distinct. It will be easier with a "real" lab. Another big issue to improve on: Take more notes in your primary lab notebook while you're in lab. What you have here is good (and very good job with the photos!). However, some things that you did are clearly missing. For example, there is no discussion at all of triggering, but I know you did that. Finally, make sure to look at all of the comments I put on these two pages. I'll email your grade. Looking forward to seeing more good work from you! Oscilloscope lab notes SJK 17:39, 13 September 2009 (EDT) 17:39, 13 September 2009 (EDT) Some parts were put in your lab summary but not in your primary lab notebook (this page). Specifically: (1) the nice photo and description of equipment and (2) a link to the oscilloscope lab page which tells the reader what procedure you're following. I put a link to your summary here, which is a good start (otherwise, someone reading this part of your notebook would have no idea about your photos) ... but putting the actual information here would have been much better. Acquire the necessary equipment Plug in the power to the oscilloscope and function generator Next connect the function generator to the oscilloscope's channel 1 Turn both pieces of equipment on, the power button on the oscilloscope is found on top, while the power button on the function generator is on the front "power" is labeled in red for easy identification. I set the sweep/function generator range to 100. I "played" with the oscilloscope until a sin function could be seen. Next I took some measurements of the initial sin function, using the grids, the cursors, and the measurement button. Note that the initial sin wave also had some amount of DC offset (the dial was turned up about halfway. Next I enlarged my power output using the function generator, I used the output dial. Next I took the measurements of a small sin wave. This time I adjusted the wave by shrinking the output level from the sweep/function generator. (As shown to me by our TA: Pranav). Finally I measured my initial sin wave using DC a high DC offset, unfortunately I forgot to record the measured DC offset(the nob was turned all the way to the right). Steve Koch 17:37, 13 September 2009 (EDT): Link to lab summary, which includes equipment model numbers, etc. Steve Koch 17:37, 13 September 2009 (EDT): Link to lab procedure that was followed Ac coupling SJK 20:10, 13 September 2009 (EDT) 20:10, 13 September 2009 (EDT) There is not enough information in this section for someone (or even you!) to understand (or remember) what you actually did. More detail is needed. The picture of the oscilloscope is a great thing to have here, good job! But more description to let you (or another reader) in the future know what it means) my view of the oscilloscope when I took the measurements from the cursors Which mode is better for viewing a ripple in DC coupling? AC couple is better for this since Ac coupling doesn't allow DC current to pass through. The advantage being you can screen for "noise" with AC coupling. Fall Time of wave using measure: 97.5ms Cursor1:103.0ms; cursor2: 204.0ms Fall time of wave using using cursors: 204-103=101ms measurements SJK Steve Koch 20:13, 13 September 2009 (EDT) Steve Koch 20:13, 13 September 2009 (EDT) There are lots of good things in this section: units on the measurements; good description of what you're measuring (peak-to-peak); and description of fluctuations sometimes. Good! peak-to-peak Amplitude of initial sin wave using grid: 5.80V Peak-to-peak amplitude of initial sin wave using cursors: (cursor1: -3.76V, cursor2: +2.04V), 2.04V-(-3.76V)=5.80V peak-to-peak amplitude of initial sin wave using measure: fluctuated between 5.76V-5.84V peak-to-peak amplitude of large sin wave using grid:2.2 squares=13.0 peak-to-peak amplitude of large sin wave using cursors: (cursor1:-6.48V, cursor2:6.48V), 6.48V-(-6.48V)=12.96V peak-to-peak amplitude of large sin wave using measure: 13.0V peak-to-peak amplitude of small sin wave using grid:2.6V peak-to-peak amplitude of small sin wave using cursors:(cursor1:-1.40V, cursor2:1.20V) 1.20-(-1.40)=2.60V peak-to-peak amplitude of small sin wave using measure: 2.60V peak-to-peak amplitude of sin wave with high DC offset using grid: 4.5V peak-to-peak amplitude of sin wave with high DC offset using cursor: (cursor1: -2.24, cursor2:2.48V), 2.48V-(-2.24V)=4.70V peak-to-peak amplitude of sin wave with high DC offset using measure: 4.72V Questions Are their waveforms that cannot measure properly? 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