... and performance, has full protections, basal and fixed position switch for frequency settings, easy front-panel. Its widely used ... top position from 151V to 300V3) Adjustable and fixed three position switch for frequency settings4) IGBT / PWM circuit5) High ... : adjustable 4763Hz (400Hz option)Fix :position switch for 50Hz220V,60Hz110V,60Hz120V settingLoad stability±1%Frequency stability≤0 ...