The Property of Electric Drift of Null Point Output for the Pressure Sensors Excited by a Self-balanced Bridge
Sun Yi · Dianzi xuebao · 2000
The relationship among output signal U,bridge voltage V e,supply voltage V cc ,fluid pressure P for pressure sensors,which are excited by a self balanced bridge,is discussed in detail.It is pointed out that electric drift of null point output is always existed not only for the bridge voltage but also for the supply voltage to the whole circuits.The typical curves among them are expressed in the 3D space of U V cc P .A high sensitivity is displayed in Vcc0 equipotential plane,for which U 0=0 but much lower sensitivity in the equipotential plane (≈(1/2)V cc0 ),for which U 0/V cc =0.It is suggested that electric drift of the null point output should be taken as one of specifications for pressure sensors.