I have two different 12v DC power supplies.

Each one of them has a Ground connector.

To Get 12 v DC I go between V+ and V-.

If I mesure between V+ and the ground connector I get a reading in the milivolt range.

So what is that Ground connector for and how do/should I use it?

Ralph

Most power supplies connect that ground to the same as the ground pin of the incoming power. It allows for the common mode rejection of the 60Hz power hum as well as gives projects an earth ground when needed. It can be connected to the negative terminal of the power supply in most cases and even the positive in many cases as well.It is best to check first however as some are internally connected to the negative terminal.

Thanks mongo, that makes sense.

Ralph