Velleman oscilloscope tutor board velleman edu06 the velleman edu06 oscilloscope tutor board will show you how to get the most out of your digital oscilloscope the board generates a number of signals which you can use to become familiar with ac dc and frequency measurements sine and square waves power supply ripple full and half wave rectifiers and oscillators the kit will also help you learn the meaning of terms such as v div time div trigger level and auto setup most of the experi