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LT1001 Strain Gauge Signal Conditioner with Bridge Excitation

Strain Gauge Signal Conditioner with Bridge Excitation

A buffered 7V reference provides a 5V excitation voltage to a balanced strain gauge resistor bridge. To provide a 0V output when the bridge is perfectly balanced, a second amplifier biases the bottom of the bridge to a negative compliment of the 5V excitation voltage. Circuit gain is set such that a 1% bridge resistance imbalance produces a 10V output.

 

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