ME345_Lecture_29

ME345_Lecture_29 - M E 345 Spring 2008 Professor John M....

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M E 345 Spring 2008 Professor John M. Cimbala Lecture 29 03/28/2008 Today, we will : Finish the example problem we started last time – designing a strain gage circuit for a data acquisition system (good exam review problem) Do another example problem to show how to compensate for lead wire effects Do C a n d y Q u e s t i o n s f o r C a n d y F r i d a y If time, begin to review the pdf module: Dynamic System Response Example Given : A quarter-bridge Wheatstone bridge circuit is used with a strain gage to measure strains up to ± 1000 μ strain for a beam vibrating at a maximum frequency of 50 Hz. all resistors and the strain gage itself are 120 Ω resistors the circuit is initially balanced at zero strain the strain gage factor is S = 2.04 the supply voltage to the Wheatstone bridge is V s = 5.00 V DC the output voltage V o is sent into a 12-bit A/D converter with a range of ± 5 V there is some unwanted noise in the signal, with f noise = 3600 Hz and amplitude = ± 0.50 mV To do : Design a circuit with the highest possible resolution (i.e., to utilize the full range of
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ME345_Lecture_29 - M E 345 Spring 2008 Professor John M....

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