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Dummy Lab PSU questions

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aluck:
I have a single-output lab PSU with three terminals on the output - plus, minus and ground. The ground is wired internally to ground pin on the wall outlet. Plus and minus are floating.

1. What's the point of having ground terminal? Can you think of some reasonable usage?

2. If I would get another one single-output lab PSU (also floating output), could I just wire (+) of one PSU to (-) of the other, call it the "ground" for my project, and use them for supplying both positive and negative voltage?

IanB:
This other thread probably answers your questions:

https://www.eevblog.com/forum/beginners/what's-the-'ground'-terminal-for-on-all-these-dc-power-supplies/

aluck:

--- Quote from: IanB on April 05, 2012, 05:11:59 am ---This other thread probably answers your questions:

https://www.eevblog.com/forum/beginners/what's-the-'ground'-terminal-for-on-all-these-dc-power-supplies/

--- End quote ---
Thanks.

But the second question still remains.

alm:
Yes, that's the whole point of floating power supplies. Either connect the center terminal to the ground terminal on one of the supplies, or call it something like 'circuit ground' to distinguish it from physical earth. You can just connect them like batteries in series or parallel (within limits, don't go crazy and connect them to high voltage supplies).

aluck:

--- Quote from: alm on April 05, 2012, 07:54:05 am ---Yes, that's the whole point of floating power supplies. Either connect the center terminal to the ground terminal on one of the supplies, or call it something like 'circuit ground' to distinguish it from physical earth. You can just connect them like batteries in series or parallel (within limits, don't go crazy and connect them to high voltage supplies).

--- End quote ---
Thanks a lot. :)

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