Specifications

Note When using the FET multiplexers with several strain gages on a single
specimen, only one guard lead needs to be connected since the guard is not
"switched" with the HI and LO terminals.
Understanding the Bridge Configurations
This section describes each bridge configuration in detail.
1/4 Bridge
Measurements
(QUARter)
In a
1
⁄
4
bridge arrangement, there is one active element (gage) in the
Wheatstone Bridge circuit (Figure 4-8). A single strain gage has the lowest
sensitivity of the bridge arrangements available; however, accurate
measurements can still be made when following the wiring guidelines
covered in Chapter 2.
Rosette Measurements
1
⁄
4
bridge measurements are used when measuring strain with rosettes. A
three element rosette, for example, would be connected to three bridge
completion channels. Each channel would then be programmed for a
1
⁄
4
bridge measurement. Each measurement (ε
1,
ε
2,
ε
3
) is then substituted into
the applicable rosette equation in Appendix B.
Figure 4-8. 1/4 Bridge Arrangement
58 Understanding the Strain Gage Multiplexers Chapter 4
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