Because some circuits, UPs, have min ramp rates on power, to power up
properly, one way is take output of supply, board disconnected, turn
voltage to desired for board you are working on, then turn current down
to 0, short supply output, and turn current up to some expected nominal.
Then connect board. I power up a lot of simple boards with 100 mA setting
(depends on board and design what you should set/expect). This generally
will prevent damage in case there are shorts or excessive out of spec loads,
while satisfying for good boards a startup that will meet its min ramp rates.
Note if there are large sized C values on board they may affect min you
have to set. eg. boost the peak current that you would set the current limit
to. To charge the large caps at a ramp rate. Q = C x V, I = C x dV/dT,
from this you can calc the ramp rate. Again where large caps are involved.
Regards, Dana.