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To set the current limitNote: There are three terminals on this supply, '''+''', temporarily short the '''-''' and '''GND'''. '''+''' and '''-''' are the positive and negative terminals together with a piece of wire or a banana plug patch cord. The between which supply should be in CC modecurrent flows, with and are the two terminals you normally use. '''C.C.GND''' lit. Adjust is a direct connection to thecurrent knobs until ground prong on the readout above them indicates the desired current. (Make sure the conductor wall outlet; you use to short this if the terminals together is large enough to safely carry the current circuit you are powering requires a safety ground, or if youneed 're dialing in''-''' to be held at local ground voltage.)
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[[File:bench_supply.jpg|thumb|650px|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.
The supply can provide up to 180 W of output power, and has built-in overload and reverse-polarity protection. Output can be set
anywhere between 0-60 V and 0-3 A using the knobs for voltage and current on the front panel.
== Theory of Operation ==
To operate this supply, you set ''upper limits'' for both output voltage and output current. The supply initially tries to keep its output at the voltage limit, by allowing current to vary. This is called "constant voltage" (CV) operation. If the current needed to do this exceeds the current limit, then the supply operates in "constant current" (CC) mode instead. In CC mode, current is held constant by allowing voltage to vary. This supply can therefore be either a constant voltage source ''or'' a constant current source! To provide constant voltage, set the current limit higher than the current your load will draw at the intended voltage. To provide constant current, set the voltage limit higher than the voltage needed to drive that much current through the load.
== Usage ==
To use this supply, you set upper limits for both output voltage and output current. The supply then initially tries to keep its output at the voltage limit, by allowing first make sure the current to vary.This limit is called "constant voltage" set high enough that you're in CV mode (CV) operation: the '''C.V.''' LED is lit when operating in this mode. If the current needed to stay at the voltage limit is greater than the current limit,then the supply operates in "constant current" (CC) mode instead, and then adjust the '''C.C.''' LED is lit instead of '''C.V.'''. In CC mode, voltage knobs until the supply holds current constant at readout above them indicates the current limitand allows desired voltage to vary. Thus, it's possible Even if nothing is connected to use this the supply to provide a constant voltage ''or, you'' a constant current ll still need to a load. To provide constant voltage, set the current limit higherthan the amount of turn current your load will draw knobs at the intended supply voltage. To provide constant current, set the voltage limit higher than the voltage needed least a hair above zero to drive the desired currentthrough the loadput it CV mode.
To set the voltage current limit, make 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 limit is set high enough that you're dialing in. If necessary, raise the voltage limit until the supply is in CV CC mode (, with the '''C.VC.''' LED lit). Then, and adjust the voltage current knobs until the readout above them indicates the desired voltage.Even if nothing is connected to the supply, you'll still need to set the current limit at least a hair above zero to put it CV mode.