In this case at each data point you want to tell the

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Unformatted text preview: every 10 seconds. Manual Data Collection The default data collection is time-based, but there are experiments in which you do not want the data to be collected automatically. For example, in a titration, you might want to measure pH as a function of the volume of base that you have added. In this case, at each data point, you want to tell the system exactly what the volume is according to the buret, and have it record pH as a function of that specific volume. Dakota State University Page 20 of 232 Using the Pasco System General Chemistry I and II Lab Manual To do this, go to “Experiment” and “Set Sampling Options.” This will open up a new dialog box for you in which you can be more precise in telling Pasco what you want it to do. In this dialog box, click on “Keep data values only when commanded.” This will automatically choose “Enter a keyboard value…” and “prompt for a value.” These are typically what you would want; the first tells Pasco to take the values from the keyboard (in our example, volume) and to prompt for this value. In “Name” put down the name that makes sense to you (such as “Volume of Base Added”), and do the same for Units (for this example, probably “mL”). Click “OK”. Now, when you click “record,” instead of automatically starting to collect data points, the system will begin collecting data, but not recording it. When you click on “Keep”, a new dialog box will open asking you what value to associate that reading with. Type in the value you want associated with this reading, and click “OK.” Manipulating Data Data Studio does have some ability to manipulate data. You will notice, on the right side of the screen, that each data set has been automatically stored. To delete one of these sets, just click on the data set once to highlight the specific run you want dele ted, and press “del.” Notice that each screen (in this case, the graph and the table) allows you to manipulate the data. For example, look at the graph. Suppose we want to expand the scale so we can see it better; to do this, simply double click on one of the scales in the graph, and choose the values you want. You can also go to “Data” and choose which data sets to display, or not. There is even a curve fitting tool that can be used. The manipulation of data depends on what you are taking and what yo u need to do with the data. Exporting data Finally, suppose you want to manipulate the data using Excel, so you can pull the graphs directly into a lab report. To do so, highlight the table so it is the active screen, and go to “File” and “Export”. Choose the run you want exported, and click “OK”. Save it as a “txt” file in an Dakota State University Page 21 of 232 Using the Pasco System General Chemistry I and II Lab Manual easy location to find. In Excel, go to “Data” and “Import external data”, and import the file you just saved. Dakota State University Page 22 of 232 Using HyperChem General Chemistry I and II Lab Manual Using Hyper Chem See? It’s an old game now. Yow are already expecting me to start with “So what is Hyper Chem?” Well, I can’t let you...
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