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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
Suppose the strain gages in the bridge in Fig. 5.21 have the value 120 kΩ ± 1% The power supplies to the op amp are ±15V, and the reference voltage,
 is taken from the positive power supply
a) Calculate the value of
so that when the strain gage that is lengthening reaches its maximum length, the output voltage is 5 V.
b) Suppose that we can accurately measure 50 mV changes in the output voltage. What change in strain gage resistance can be detected in milliohms?

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