72 configuring scienceworkshop interface in

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7.2 Configuring ScienceWorkshop Interface in DataStudio Now that you have the equipment assembled properly the next step is to configure these within DataStudio so that they may effectively record data. DataStudio has capacity to control a broad range of different probes/sensors but for our purposes you will only need to configure the Current and Voltage Probes as well as the Power Amplifier. Proceed as follows: With the probes and amplifier properly connected, turn on the ScienceWorkshop and Power Amplifier by flipping the switches located on the back (IMPORTANT: All equip- ment should be plugged in and turned on prior to starting DataStudio, otherwise the probes may not be detected properly by the program). Locate the DataStudio icon on the desktop of your computer open it. You will be prompted with a screen asking “how would you like to use DataStudio?” Select “Create Experiment.” The screen should now display a window titled “Experiment Setup” with a picture of the ScienceWorkshop, as seen in Figure ?? . Click the button “Add Sensors or Instrument” at the top of the this window and select one of your Analog Channels. A list of Sensors should appear. From this list select the probe/sensor you want to associate with this Analog Channel. Voltage Probe Analog Channel A Current Probe Analog Channel B Power Amplifier Analog Channel C Once you’ve added the Power Amplifier to Channel C you will notice a window titled “Signal Generator” has appeared. This window will allow you to all available outputs for the Power Amplifier. Notice in the drop down menu it can generate the following (among others): DC Voltage Sine wave 9
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Figure 9: DataStudio - Configuring your probes. Square wave Sawtooth wave positive and negative ramping The “Signal Generator” window has various other options for you to configure: Amplitude Signal Frequency Sampling Rate Note the “Auto” button. When selected the signal generator will automatically turn on when you start collecting data. In some cases this will be useful, but otherwise you can manually turn on the signal generator by deselecting the “Auto” button and subsequently pushing “On”. You are now ready to start collecting data. Figure 10: DataStudio Signal Generator 10
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8 Resistance and Temperature Generally, when a resistor is said to be ohmic it implies the voltage drop across it behaves according to Ohm’s Law for some range of current and fixed value of resistance. Thus the voltage drop ( V ) will be linearly related to the current ( I ) with R being constant (as stated in Ohm’s Law. Conversely, a non-ohmic resistor does not exhibit a linear relationship between its voltage drop and current; this is because the value of resistance may change as the current changes. One reason for this is as the current varies so will the component’s temperature (since more or less power is being dissipated as heat) and the value of resistance can be highly variable
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