Pressure measurement circuit diagram

It is a measuring circuit, when the force is 0~1500g. U. Output 0~1500nN (sensitivity ImV/g). The power supply is powered by
±12V, and the force sensor is powered by 12V (about 10V) after being stepped down by three diodes. A1~A3 form an instrument amplifier , and its differential input
terminal is directly connected to the ② and ④ pins of the force sensor. A4 is connected as a follower, and the voltage of the potentiometer RP2 is input. Its function is to eliminate the zero point output,
that is, when the force is zero, if the bridge has an unbalanced output or the amplifier has an offset voltage, RP2 can be adjusted. Make the output U. -ov. Adjust RP1
(magnification adjustment) to make Uo =1500mV when the full-scale force is 1500g.
    In order to ensure the accuracy of the instrument amplifier , the resistors should be metal film resistors. The accuracy of the resistors in A1 to A3 is 1% or matched.