DDS-3X25 USB Synchronized output If you generate a waveform by software, there is a synchronized signal output from “SYNC” terminal. The signal is square waveform, the frequency of which is equal to the waveform you generated. For example, if you generated an 1 KHz, sine waveform, you will also generate an 1 KHz, square waveform simultaneously. The waveform on CH1 is the sine waveform you generated from the “OUTPUT” terminal, and that on CH2 is the synchronized signal from “SYNC OUT” terminal. DDS-3X25 USB User’s Guide 34