FIELD: radio engineering.
SUBSTANCE: metre of non-linear distortions with differential amplification and with double T-shaped bridge connected to its output and consisting at the input of parallel connected differentiating and integrating branches. From output to non-inverting input through double T-shaped bridge of positive feedback setting by means of values of RC-elements of double T-shaped bridge the frequency of produced oscillations. Outputs of differentiating and integrating branches are connected to non-inverting inputs of introduced first and second operating amplifiers covered with negative feedbacks; connections of their outputs to inverting inputs are made through arms of introduced doubled potentiometre tuning the generation frequency. To output of differential amplifier, to outputs of the first and the second operating amplifiers there connected is introduced third potentiometre the movable contact of which is output of frequency-tuned metre of non-linear distortions and input of the latter is connected to output of differential amplifier through introduced fourth potentiometre to the movable contact of which there connected is metre of effective values.
EFFECT: eliminating the dependence on frequency of value of phase shift in amplifier-phase shifter.
