question archive You are using a quarter-bridge circuit to measure the strain on a beam
You are using a quarter-bridge circuit to measure the strain on a beam
Subject:Electrical EngineeringPrice: Bought3
You are using a quarter-bridge circuit to measure the strain on a
beam. The strain gauge has a nominal resistance of 120 Ω and strain gauge factor of 1.92. The other three resistors used in the circuit have nominal resistances of 120 Ω. An adjustable power supply is used to apply a 5.00 V source voltage to the bridge circuit. Prior to loading the beam, the bridge is initially balanced.
a)If the beam experiences an axial strain of 392 microstrain, what output voltage do you expect from the bridge circuit?
b)You perform the measurement and observe an output voltage of 4.1 mV from the bridge circuit. What is the axial strain on the beam in microstrain?
c) Due to constraints with your voltage measurement equipment, you need to increase the output voltage that you will see for a given amount of strain. What's the easiest thing you can do to accomplish this in your current bridge circuit setup?
