As I am exploring instruments and played with them, in order to understand them better.
I have digital oscilloscope and Lab DC Power supply.
With DC Lab Power supply set to 5V and tip to positive terminal and clip to ground terminal, to my surprise, the mean reading is 430mV while RMS reading is 75.5V.
Using the clip on ground pane of any DC circuit board is akin to ground terminal of the Lab Dc Power Supply. The question is how are they different?
What can I do do with ground terminal of power supply, besides rail to rail DC output? Can I use this ground terminal to connect to any ground pane of the circuit board under test with +/- or + power supplied?
Thanks in advance