Due to the differences in the key materials of the sensors, the strain and the projectile body and the manufacturing process, the parameters of each sensor are inconsistent, mainly because the sensitivity is inconsistent. This inconsistency is commonly referred to as the angular difference. The proper term of the box is to connect the output signal of the sensor to the junction box first, and then send it to the instrument, adjust the angle difference by adjusting the potentiometer inside the junction box, and then make the sensitivity of each sensor close to the same, so as to ensure the balance of the whole scale body. balance.