ES436809A1 - An improved electronic resistance (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

An improved electronic resistance characterized in that four op amps (OP1 ... OP4) are connected in series with respect to their inputs (1 ... 8); because the output of each of said op amps is connected through two resistors (eg, R2, Z1) to its two inputs and because all eight inputs (1 .... 8) of the four op amps (OP1 ... OP4) is interconnected as follows: - the inverting input (1) of the first operational amplifier (OP1) represents a first terminal (E1) of a pair of terminals (E1, E2) of the electronic resistance; - the non-inverting input (2) of the first operational amplifier (OP1) is connected through a first resistance (R4') to the inverting input (3) of the second operational amplifier (OP2); - the non-inverting input (4) of the second operational amplifier (2) and the non-inverting input (5) of the third operational amplifier (OP3) are interconnected through an insulating capacitor (C) and represent two test terminals (M1, M2) of the electronic resistance; - the inverting input (6) of the third operational amplifier (OP3) is connected through a second resistor (R4) to the non-inverting input (7) of the fourth operational amplifier (OP4), and - the inverting input (8) of the fourth operational amplifier (OP4) represents a second terminal (E2) of the pair of terminals (E1, E2) of the electronic resistance. (Machine-translation by Google Translate, not legally binding)