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Full-Bridge Type I

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    Last Modified: February 16, 2016

    The full-bridge type I configuration only measures the bending strain.

    The following figure shows how to position strain gage resistors in a bending configuration for the full-bridge type I.

    Full-bridge type I strain gage configurations have the following characteristics:
    • Four active strain gage elements, two mounted in the direction of bending strain on the top side of the strain specimen and the other two mounted in the direction of bending strain on the bottom side.
    • High sensitivity to bending strain.
    • Rejection of axial strain.
    • Compensation for temperature.
    • Compensation for lead resistance.
    • Sensitivity at 1000 µε is ~ 2.0 mVout / VEX input.

    Full-Bridge Type I Circuit Diagram

    The following symbols apply to the circuit diagram:
    • R1 is the active strain gage element measuring compressive strain (–ε).
    • R2 is the active strain gage element measuring tensile strain (+ε).
    • R3 is the active strain gage element measuring compressive strain (–ε).
    • R4 is the active strain gage element measuring tensile strain (+ε).
    • VEX is the excitation voltage.
    • RL is the lead resistance.
    • VCH is the measured voltage.

    The following equation converts voltage ratios to strain units for full-bridge type I configurations.

    where Vr is the voltage ratio that virtual channels use in the voltage-to-strain conversion equation, and GF is the gage factor.


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