Dave's video "How NOT To Blow Up Your Oscilloscope" scared me a bit.
I've been playing around with battery powered stuff so far, but I've now got a lab power supply, proper oscilloscope and function generator, so I need to think about ground.
This is the power supply:
https://www.velleman.eu/products/view/?id=439082 (Velleman LABPS3005DN)
It has a separate ground terminal, so I guess it's "floating" unless I connect ground with minus (or plus), right?
The oscilloscope and function generator (both Siglent) are properly grounded, I think.
I've attached an image of the current state of my experiment. It's a breadboard where power to a servo is provided by a USB power bank, and a PWM signal is provided by the function generator (via the BNC cable there). The servo is functioning as expected, and I can adjust its position from the generator. The only grounded item so far in the setup is the function generator, so according to Dave I should be safe.
Next I could replace the USB power bank with the lab power supply, and I'm still safe, right? No possibilities of a ground loop?
But what about if I connect the oscilloscope to measure the signal sent to the servo? My initial thought would be to connect oscilloscope ground to the minus rail on the breadboard and the probe to either the plus rail or the (orange) signal, or maybe one probe on each. Suddenly I have 2 grounded items connected through the breadboard. Can I now blow everything up if I accidentally short something?
