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[[File:bench_supply.jpg|rightthumb|600px650px|GW Instek GPR-6030D Linear DC Power Supply]]
The GPR-6030D is a regulated DC power supply. Hacksburg's GPR-6030D is owned by a member but has no restrictions on use.
To set the current limit, temporarily short the '''-''' and '''+''' terminals together with a piece of wire or (ideally) a banana plug patch cord. Make sure this conductor is large enough to safely carry the current you're dialing in. If necessary, raise the voltage limit until the supply is in CC mode, with the '''C.C.''' LED lit. Then, adjust the current knobs until the readout above them indicates the desired current.
Note: There are three terminals on this supply, '''+''', '''-''' and '''GND'''. '''+''' and '''-''' are the positive and negative terminals between which supply current flows, and are the two terminals you normally use. '''GND''' is a direct connection to the ground prong on the wall outlet; you use this if the circuit you are powering requires a safety ground, or if you need '''-''' to be held at local ground voltage.