... w/AM FM function MCH DDS Function Generator, SM-4040 DDS Function Generator, 40MHz Freq., built-in frequency counter. ... 20/40/80/120MHz2.Built-in arbitary:10mHz-100KHz3.Arbitary waveform:10mHz-100KHzResolution1.μHzfreq. accuracy≤±5PPmtemperature coefficient≤2PPm/° ... 40/80/120MHzModulation WaveformSine, square, triangle, ±Ramp, ±Pulse, Rise/fall exponential,Rise/fall logarithm,Gause noise,Cardiac,SIN ...