Measurement circuit diagram of differential pressure sensing bridge

The figure below is a measurement circuit including zero point and range adjustment circuit, feedback resistor network and differential pressure sensing bridge . Constant current source IO represents the output current. The four bridge arm resistors are R1S, R3S, R4S and R6S. When the measured positive pressure increases, the resistance values ​​of R1S and R6S decrease, the resistance values ​​of R3S and R4S increase, and the output signal VBr of the bridge increases in the negative direction. This VBr corresponds to the voltage deviation signal of the measured pressure change value. Through the action of the negative feedback resistor network in the measurement circuit , the VBr signal will remain very close to zero.