Why you need a Wheatstone Bridge to get accurate Strain Gauge Readings

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In this video David from Omega explains what a Wheatstone Bridge is and how it's used to get stable and accurate readings from a strain gauge.
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Great explanation, I was searching for this relation while asking myself why my bathroom scale is showing different results while standing at different spots. Suppose the four build in sensors are connected the same way 🍻

mumbucorporation
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Can we connect two strain guages in a single wheat stone bridge ?

ArunKumar-eusc
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How can we measure displacement using strain gauge?

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But *why* ? What is the objective benefit? A reference inside my voltmeter could be equally precise, right?

I feel like the "why" was not truly answered here. just a bit of circular reasoning. Nonetheless, this is a very difficult topic to explain.

AdityaMehendale