Features:Can output arbitrary waveforms and conventional function waveforms(sine/triangle/square/sawtooth wave and TTL signal).All functions are digitally controlled, precise and stable.Dual-channel output, can work in sync, phase difference is adjustable.With linear sweep(Max. up to 999s) and logarithmic frequency sweep functions.Signal of both channels has built-in sophisticated -20dB attenuator in order to reach the minimum amplitude resolution 1mV.With 120% ~ + 120% DC bias function.4 TTL output(phase difference is adjustable).Has a frequency measurement, period measurement, positive and negative pulse width measurement, duty cycle measurements and counting function.With USB interface, after the connection with PC, the PC can be used to control the instrument.