Can you always put them together or are there any conditions where you should never combine them?
I am wondering if I can use my function generator to drive an transistor... the problem is, that my FG seems to have mainsGround while my power supply doesn't. The PS has a 3th yellow connector that is mainsGround, but I don't know I can just short that with the negative rail of the PS.. or can I?
I remember a video of Dave where he talks about the danger of connecting oscilloscope probes (positive probe tip) to mainsGround, but I don't remember anything about him talking if I can safely connect all grounds together.
If I had 3 different power sources.. like a LabPS a battery and some other device.. is it in general safe to connect all grounds together?
ps: I just watched Daves video again and it seems to be OK to short negative rail of the PS with the mainsGround.