Uploaded August 2021 | Updated September 2026, 11 hours ago

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The story for strain gage sensors resistance value goes back many decades. Originally, 120 Ω was used, because that value matched the impedance characteristics of the available instrumentation, and was a convenient enough value to manufacture in common sizes using 25 µm diameter wires. Modern instrumentation eliminates the requirement for 120 ohms, and allows for much higher resistances, if needed, for example, 5000 Ω. Today, gage resistance has more to do with the overall size of the gage grid and certain performance characteristics.

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