Fortunately it was an analog stereo so be could set

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Unformatted text preview: would not have been able to turn it down; his only choice would be to turn it on or off. Fortunately, it was an analog stereo, so be could set the volume to any value be wanted between the stereos lower and upper limits. “But wait,” some of you are surely thinking, “I have a stereo at home that is digital, and I can set the volume on that stereo as well.” Ours has become a digital society; digital signals are cleaner and more reliable than analog signals, so they are used for all kinds of things, like television, radio and even telephone signals. What makes these devices digital is that they “think” in terms of ones and zeros. The problem is that, while we might not care how the device works internally, we do care how devices present their output to us. If all we got out of our stereo was a stream of ones and zeros, it would not be of much use to us. We need an analog output to make sense to us (since, after all, we are analog creatures). To accomplish this, our digital devices have “digital to analog converters”, or “DAC’s”. These convert the streams of ones and zeros into an analog signal that sounds like music to us, and even allows us to choose the volume we want. As you might well imagine, if we can convert a digital signal to an analog signal, then we should be able to turn it around and convert analog signals to digital. We can, and, not surprisingly, to do so we need an “analog to digital converter” or “ADC”. Your mobile phone has one of these (as well as a DAC) which it uses to convert your spoken (and analog) words into a digital stream of ones and zeros that it can transmit. Essentially, this is what the Pasco system is: the black box (literally) is nothing more than an analog to digital converter, albeit somewhat larger than the one in your cell phone. The Pasco probes are really just devices that convert certain measurement into voltages; for example, the “temperature probes” give off higher voltages as the temperature increases. These voltages, just like temperature, are analog in nature. When you plug this probe into the Pasco box, the box convents this voltage into a digital signal, that your computer can interpret, store and manipulate. Naturally, yo ur computer has to know how to deal with this data, so, of course, yow will need the appropriate Pasco software. This is to introduce you to the Pasco software and provide you with the basic process for using your Pasco system to collect data on your computer. Starting Pasco Dakota State University Page 17 of 232 Using the Pasco System General Chemistry I and II Lab Manual Of course, we will begin by assuming that you have already installed the Data Studio software on your computer. Make sure that you have installed both the Data Studio software as well as the PasPort hardware driver. If this is the first time you’ve used PasPort sensors, get the CD and install Data Studio. Keep the CD in the drive as you plug in the PasPort interface and Windows will automatically install the software. When the question is asked regarding ...
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This note was uploaded on 09/18/2012 for the course CHEMISTRY 1010 taught by Professor Kumar during the Fall '11 term at WPI.

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