Adopt the Direct Digital Synthesizer (DDS) technology and provide stable, precise, pure and low distortion signals. Desktop design with ABS plastic housing, AC 100 - 240V (AC) wide voltage supply; VCO function: Support VCO voltage control signal output function (such as voltage controlled oscillator). Various modulation types: AM, FM, PM, ASK, FSK and PSK modulations. 2.4 inch TFT Color LCD with 320x240 resolution, displaying parameters and graphics of the two channels at the same time.The instrument uses 14-bit high-speed D/A converter chip (5Vpp output quantization error is less than 1mV), 250MSa/s sample rate, 14bits vertical resolution. Fully independent dual-channel output (equivalent to two independent signal sources), able to work synchronously, and the phase difference can be accurately adjusted;Equipped with channel tracking function, when the tracking function is turned on, all parameters of both channels can be updated according to the user's configuration at the same time; Enable to store 64 arbitrary waveform data files, each one of waveform storage depth 8192 points * 14bits;High frequency accuracy: Frequency accuracy can reach 10-6 orders of magnitude;The frequency resolution is relatively high: the full-range frequency resolution is 1uHz (0.000001Hz);100M Frequency meter function: It can measure frequency, period, pulse width and duty cycle. Max. frequency workable is 100MHz and Min. frequency workable is 0.01 Hz. Amplitude resolution is higher: Amplitude resolution can be as low as 1mV (0.001V);With -10V~+10V DC bias function (<20MHz), resolution up to 1mV;The duty cycle of both channels can be adjusted independently, with an accuracy of 0.01%;Counter Function: It has 2 coupling measure modes including DC coupling and AC coupling. This design can solve inaccuracy problem of AC coupling.