Measurement-computing 6224 Manuel d'utilisateur télécharger pdf (Page 28)

6224 User’s Manual Strain and Pressure/Force 7-3

Quarter-Bridge I

Quarter-bridge type I measures either axial or bending strain.

Quarter-bridge type I has the following characteristics:

A single active strain-gauge element is mounted in the principle direction of axial or bending strain.

A passive quarter-bridge completion resistor (dummy resistor) is required in addition to half-bridge completion.

Temperature variation in specimen decreases the accuracy of the measurements.

Sensitivity at 1000 is ~ 0.5 mV

out

/ V

input.

The following symbols apply to the above circuit diagram and to the equations provided in the supplemental information.

R1 and R2 are the half-bridge completion resistors.

R3 is the quarter-bridge completion resistor (dummy resistor).

R4 is the active strain-gauge element measuring tensile strain (+ ).

Supplemental Information

Data from strain channels (Quarter-Bridge I) is converted to strain units using the following equation:

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Measurement-computing 6224 Manuel d'utilisateur Page 28