FIELD: electricity.
SUBSTANCE: device consists of a metre bridge 1 formed by precision resisters 2, 3, 4, 5, linearising resistor 6, reference voltage source 8, differential amplifier 7, difference scheme 9, integrator 10; at that outputs of the metre bridge 1 are connected to the following inputs: differential amplifier 7; outputs of reference voltage source 8 and differential amplifier 7 are connected to inputs of difference scheme 9, output of the difference scheme 8 is connected to the integrator 10 input; output of the integrator 10 is connected to one output of offset-setting resistor 6 while the other output offset-setting resistor 6 is connected to one output of the metre bridge.
EFFECT: enlarging the range for offset voltage value of strain-measuring bridges due to automatic maintenance of offset voltage which depends only on coefficient of amplification K of the differential amplifier and voltage Uref of reference voltage source.
2 dwg
