SBOS936E November 2019 – August 2022 OPA182 , OPA2182 , OPA4182
PRODMIX
A strain gauge is used to measure an alteration due to external force through the use of electrical resistance in a Wheatstone-bridge configuration. The Wheatstone bridge is used to precisely measure very low values of resistances down in the mΩ range. An excitation voltage is applied to the bridge, and the output voltage across the middle of the bridge is measured. The total change in output voltage is relatively small, typically in the mV range. Therefore, an op amp is used to amplify the signal. The OPA2182 is designed to construct high-precision amplification.
Use the following parameters for this design example: