FIELD: study of power parameters of machine-and-tractor unit. SUBSTANCE: stand includes model of tractor and braking plant; each of them is provided with DC commutator motor, AC induction motor and reduction gears rigidly connected with them; driven shafts of reduction gears are interconnected by means of coupling; shafts of electric motors are provided with sensors which are connected to output voltage level dividers for taking the required characteristics. Control circuit includes power supply unit which is connected to DC commutator electric motor through voltage regulator and measuring instruments, as well as to stator of AC induction in mode of constant load through toggle switch, voltage regulator and pilot lamp and in mode of alternating load through multivibrator, toggle switch, voltage regulator and pilot lamp. EFFECT: reduced consumption of labor. 2 cl, 1 dwg
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