As a sidenote it is very important to save your data

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As a sidenote, it is very important to save your data during the labs. Below ‘Open Activity’ you probably saw ‘Save Activity’. This should be done often, particularly at the end of the lab session. For now, you can ignore the ‘Experimental Setup’ and ‘Signal Generator’ Windows. Sim- ply maximize the Graph 1 window to get a better view. We’ll be dealing with this window exclusively in this assignment. 2.2 Selecting and Zooming By clicking and dragging a bounding box, you’re able to make a selection. The selected data will appear yellow, and will shift the program’s focus in everything from zooming, to exporting and fitting. There is a flat portion of the graph in which V=0. How close to zero is it? Select a portion of this data and let’s zoom in on it. There are four zoom buttons in the left-most portion of the graph’s toolbar. They can be seen in Figure 2. Click ‘Scale to fit’, probably the most useful one of these. 2
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You should now be zoomed in on your selection, and it is apparent that the voltage is not simply zero. To find out what it is, let’s try the Statistics tool in the graph window. There is a button on the graph toolbar that looks like this: Σ, with a dropdown menu. Click the dropdown menu, and select ‘Standard Deviation’, as seen in figure 3. Figure 2: Graph zoom tools A box will appear listing the minimum, maximum, mean, and standard deviation. This procedure is exactly like that in the ‘Approximation of Noise’ section of lab 1 and should be done during every lab that you use the voltage probe (pretty much all of them). What is your best guess for the steady-state voltage and its uncertainty? Deselect your data by clicking in some whitespace, then click ‘Scale to fit’ again. This time, it zooms over your entire dataset. 3
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Figure 3: Statistics Tools 2.3 Extracting and Exporting You may have noticed the large jump in voltage followed by an exponential decay around t = . 56 s . Eventually, we’ll be fitting a model exponential function to this in order to find the characteristic decay time. In order to do this, we must extract the meaningful data first. The steady state voltage we just dealt with may be useful to find the approximation of noise, but clearly is not part of our model exponential. In fact, you’ll see in the lab that it is simply the time between starting the data collection (the ‘Start’ button at the top of the screen) and turning on the voltage in the circuit. It is completely irrelevant to us
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