# HW6 - Texas A&M University Department of Mechanical...

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Texas A&M University Department of Mechanical Engineering MEEN 260 Measurement and Instrumentation in Mechanical Engineering Fall 2010 Assignment #6 Due Monday, Oct 18, 2010 Problem 1: (4 Points.) A simple Wheatstone bridge as shown below is used to determine the value of an unknown resistance . If upon initial null balance is 120 and if when and are interchanged null balance is achieved when is 160 what is the value of the unknown resistance ? Problem 2: (6 Points.) Consider the same figure as in Problem 1. If a thermistor Whose resistance is governed by (1) is placed in leg 1 of the bridge while determine the bridge output when T = 400°C if at and . Plot the bridge output from to and determine the maximum deviation from linearity in this temperature range. v i + - i R 3 R 1 R 2 R 4 i 1 i 3 i 2 i 4 v o i g v 1 v 2 R 1 R 3 Ω R 2 R 4 R 3 Ω R 1 RR 0 β 1 T -- 1 T 0 ----- ⎝⎠ ⎛⎞ exp = R 2 R 3 R 4 R 0 === R 0 1000 Ω = T 0 27 ° C = β 3500 = T 27 ° C = T 500 ° =

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Solution October 11, 2010 2 Solution Problem 1:
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## This note was uploaded on 01/03/2011 for the course MEEN 260 taught by Professor Langari during the Fall '08 term at Texas A&M.

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HW6 - Texas A&M University Department of Mechanical...

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