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  • Strain-gages Wiring Systems
    A strain gage Wheatstone bridge is configured with quarter, half or full bridge system according to the measuring purpose. The typical wiring systems are shown in Figs. 4,5 and 6.
    Quarter bridge system
    With the quarter bridge system, a strain gage is connected to one side of the bridge and fixed resistors is connected to each of the other 3 sides. This system can easily be configured, and thus it is widely used for general stress/strain measurement. The quarter bridge 2-wire system shown in Fig. 4-1 is largely affected by lead wires. Therefore, if large temperature changes are anticipated or if the lead wire length is long, then the quarter bridge 3-wire system shown in Fig. 4-2 must be used. For the quarter bridge 3-wire system, refer to "Method of Compensating Temperature Effect of Lead wire"
    Half bridge system
    With the half bridge system, strain gages are connected to the bridge, one each to adjacent or opposite sides with fixed resistor inserted in the other sides. See Figs. 5-1 and 5-2 . There exist the active-dummy method, where one strain gage serves as a dummy gage for temperature compensation, and the active-active method, where both gages serve as active gages. The half bridge system is used to eliminate strain components other than the target strain; according to the measuring purpose, 2 gages are connected to the bridge in different ways. For details,refer to "How to Form Strain Gage Bridges"
    Full bridge system
    See Fig. 6. The full bridge system has strain gages connected one each to all 4 sides of the bridge. This circuit ensures large output of strain gage transducers and improves temperature compensation as well as eliminates strain components other than the target strain. For details, refer to "How to Form Strain Gage Bridges"
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