The DG800/DG900 make generation of Dual-Tone Signals simple and reliable. Just input your frequency and amplitude and you can generate complex dual tone signals using just 1 channel. Great for filter testing as well as emulation of real world signals. DG800 Series Product and DG900 Series Product Page: https://www.hexoind.com/index.php?ws=category&cid=322861&cat=Waveform-Generators&subcat=Rigol