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2. (30 points) Given: A quarter-bridge Wheatstone bridge circuit is used with a strain gage to measure strains up to 11000 ustrain for a
2. (30 points) Given: A quarter-bridge Wheatstone bridge circuit is used with a strain gage to measure strains up to 11000 ustrain for a beam vibrating at a maximum frequency of 10 Hz. The supply voltage to the Wheatstone bridge is Vs= 5.00 V DC All Wheatstone bridge resistors and the strain gage itsclf are 120 2 The strain gage factor for the strain gage is S= 2 The output voltage Vo is sent into a 12 bit A/D converter with a range of + 5 V Op-amps, resistors, and capacitors are available in the lab !3! (a) To do: calculate the voltage output from the bridge, If the analog signal can be first passed through an amplifier circuit, compute the amplifier gain required to reduce the quantization error to 2% or less. (b) To do: Describe with neat sketches about the bridge circuit and amplifier diagram. (c) To do:If the applied force F=0, usually the output voltage after the A/D converter is not equal to zero, give your explanations and methods to eliminate the influence of this offset voltage. Strain gauge F Cantilever beam
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