FIELD: electronics. SUBSTANCE: device has two input terminals, algebraic addition unit, integrator, de-energization unit. Algebraic addition unit is made in form of operational amplifier and three like-resistance resistors. Integrator is made in form of operational amplifier which has capacitive feedback unit, switch connected in parallel to feedback unit, and input resistor. De-energization unit is made in form of operational amplifier with feedback unit. According to the other variant the device has two input terminals, precision amplifier, analog-to-digital converter, two algebraic addition units, three multiplication units, two integrators. EFFECT: improved precision of measurement. 2 cl, 2 dwg
