I would like to learn to use an oscilloscope properly. I used them a few times at school, but that was a long time ago and I've forgotten most of what I learned about their use.
I'm now working with sensors and PLC based control systems driving hydro-electric turbines. I think being able to look at the waveforms of sensor signals and check for noise etc would be useful in troubleshooting applications. I've got a cheap USB oscilloscope (SainSmart DDS120) so: where are the best online training resources for learning how to use an oscilloscope?