AME-4004 Universal System is a 4-in-1 instrument, it includes DDS function generator with linear / logarithmic frequency sweeping, DC offset function, 4 channels regulated DC power supply (one adjustable and three fixed) with current limit, overload and short-circuit protection, frequency counter with low-pass filter and attenuator in pre-circuit, True RMS digital multimeter with 80,000 counts display, analog bar-graph, relative and max /min value measurement, RS-232C interface.