Measurment_Lab_Experiment3_Wheatstone_Bridge_and_Thermocouple_Spring_2010

Measurment_Lab_Experiment3_Wheatstone_Bridge_and_Thermocouple_Spring_2010

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e 1: Wheatstone Bridge 2: Thermocouple Setup Spring 2010 CEE 291 – LABORATORY EXPERIMENT Lab 3: Wheatstone Bridge and Thermocouple 1.) Wheatstone Bridge Most measurement systems implement a bridge type configuration to improve the accuracy of the physical property being measured. One extremely popular type is the Wheatstone Bridge, as seen in Figure 1. The basic function of the bridge is to measure an unknown resistance (R x ) by varying a known resistance (R k ). The unkown resistance is related to the physical property being measured like strain, temperature, pressure, etc. In this lab, we will use a photoresistor, which varies the resistance based on the sensor’s exposure to light. We will use a 10 kOhm Potentiometer to create a balanced and unbalanced system. A multimeter will be used to measure the voltage across the bridge. Learn the System: 1.) Use the multimeter to determine the size of the fixed resistors. They should be the same value. 2.) Use the multimeter to familiarize yourself with the potentiometer. 3.) Construct your Wheatstone bridge as seen in the diagram above. Then turn on your 5V power source. Using the screw driver, turn the potentiometer to zero the voltage across the bridge.
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Measurment_Lab_Experiment3_Wheatstone_Bridge_and_Thermocouple_Spring_2010

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