SURFACE PRESSURE METER Russian patent published in 1994 - IPC

FIELD: precision measurements. SUBSTANCE: meter has Wilhelmi scale, control unit, ferromagnetic core coupled with a holder of scale pan and located within the coil. Wilhelmi plate, system for recording deflections of the core from equilibrium position and circuit for compensating for a current in the coil. The system for recording deflections of the core is made in the form of a capacitor one of the plates of which is fixed to the core and the other is fixed to the end-face of the coil. The circuit for compensating a current in the coil comprises a high-frequency generator, controllable detector, amplifier and ammeter, the high-frequency generator being connected to one of the plates of the capacitor, one of the inputs of the amplifier. The second plate of the capacitor is connected to the detector control input. The output of the detector is connected to the second input of amplifier the output of which is connected in series through the ammeter to the coil. EFFECT: enhanced accuracy. 2 dwg