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Unformatted text preview: Page 1 of 2 AA320 Aerospace instrumentation Prelab Assignment for Lab 2 Week of October 10, 2011 Please work through these problems before your lab session. 1. Wheatstone bridge : Consider the following bridge, where resistor R s is a sensor whose resistance changes with temperature: R s = R+ R , where R is its resistance at some reference temperature T o , and R is the change in resistance due to a temperature change in the sensor. The other three (ordinary) resistors in the bridge are chosen to have resistance R , and the bridge is "excited" by power supply voltage V . A digital multimeter (DMM) measures the voltage V ab between nodes "a" and "b". Show that if R << R , we have approximately: V ab = V 4 R R . Suppose the characteristic of the sensor is R/R = (T-T o ) , where = 10-4 / C and T o = 25 C . If V = 10 Volts, what is V ab at T = 30 C? At 100 C? 2. Adding capacitors: Consider capacitors in parallel and in series: Parallel case . The same voltage Vc appears across...
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- Fall '09