DDS-3X25 USB Now, the combine device serial number of “Device1” is 3, and the number of “Device2” is 0. On the oscillograph, you will see the waveform of CH1 and CH2 are synchronized. If you set the phase of Device 2 to 0.5, the waveforms on the oscillograph will change as below. DDS-3X25 USB User’s Guide 33