DEVICE FOR MEASURING NONLINEAR DISTORTIONS WITH GENERATION OF VARIABLE DISTORTIONS

摘要

FIELD: physics.;SUBSTANCE: device consists of a first and a second operational amplifier (OA) with a negative feedback with coefficients six and four. Inverting inputs of the operational amplifiers are connected to the output of a differential amplifier (DA) and to the point of connecting resistors and capacitors in series and in parallel branches of a Wein bridge. A standalone power supply of the first operational amplifier is connected to the output of the differential amplifier and while that of the second operational amplifier is connected to the inverting input of the differential amplifier. Outputs of the first and second operational amplifiers are connected to a first potentiometre whose sliding contact is connected to the non-inverting input of a third operational amplifier whose output and inverting input are linked by a feedback with coefficient equal to one, and connected by power leads through resistors to power buses and through capacitors to the lead of the second potentiometre. A third potentiometre is connected to the output of the differential amplifier and the input of the device for measuring nonlinear distortions and its sliding contact is connected to a device for measuring effective values.;EFFECT: preventing dependency of the value of phase shift on frequency in an amplifier - phase shifter.;1 cl