FIELD: graduation or testing of exemplary portable dynamometers during their certification. SUBSTANCE: proposed machine includes power frame, force-setting cylinder, pump set, loading controller, hydraulic distributor, hydraulic accumulator, reference force transmitter, force-measuring unit, electric unit controlling hydraulic distributor and parts for installation of dynamometers. Bushing with wall flexible in radial direction and conjugated to plunger of hydraulic cylinder for radial deformation under action of pressure of working liquid on its external surface is placed immobile in hydraulic cylinder. Friction forces are formed thanks to it between bushing and plunger. EFFECT: diminished error in reproduction of force and enhanced authenticity of results of graduation of dynamometers. 1 dwg
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