FIELD: measurement technology. SUBSTANCE: stable current source is made in form of operational amplifier 6 and four precision resistors 1-4. Two resistors are connected with inverting input of operational amplifier, two other resistors are connected to non-inverting input of the amplifier. Tuning resistor 8 is connected in series with resistor in the circuit "non-inverting input of operational amplifier - output of operational amplifier". Current source also has two kinematically connected switches 9 which have movable terminals connected with resistors which are connected to non-inverting input of operational amplifier. Motionless terminals of the first switch are connected with poles of input voltage supply. Motionless terminals of the second switch are connected with earth and with output of operational amplifier. When tuning the device its circuit is converted to differential amplifier by tuning resistor by means of switches mentioned above. Input voltage of tuning resistor is reduced to zero. EFFECT: improved precision of measurement. 1 dwg
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