I just purchased an adjustable DC power supply.
https://www.amazon.com/Variable-Eventek-Adjustable-Regulated-Alligator/dp/B07DQR177D It has three terminals : "-"(black), "ground"(green) and "+"(red).
When I test it with multi-meter, there is no voltage between the negative rail and the ground rail. Same for the voltage between the ground rail and the positive rail.
When I connect the negative rail and the positive rail together, it works correctly. However, this is not why I bought an adjustable DC supply with 3 terminals.
I bought it so that I can use operational amplifiers...
What would the purpose of this ground terminal?
Is there a way that I can use this adjustable DC power supply as I want to use it?