Constant voltage mode is defined as an operating mode in which the DC source maintains its output voltage at the programmed voltage setting despite changes in load, AC line, or temperature. In comparison, constant current mode is defined as an operating mode in which the DC source maintains its output current at the programmed current limit despite changes in load, AC line, or temperature. For a more detailed assessment of DC priority modes and help in selecting what mode is better suited for a particular application refer to the Keysight blog, Characteristics of DC Power Source Priority Modes.