A DC benchtop supply is usually ground free, i.e. the negative output is floating wrt earth ground. I used to use HP E3630A which has an additional "Earth Ground" pin and to which I shorted the "-" pin.
Now I have a power supply (Keysight E3648A) that has only four outlets: "+", "-" for each "Output 1" and "Output 2". I need +/-5V for testing a PCB so I put them into track mode and short "Output 1 -" with "Output 2 +", calling this "ground".
This "ground" and the supply voltages go to my test PCB which has its grounds (indirectly) connected to other devices over SMA cable shields (signal generators, signal analyzers).
Now I am not sure how to best connect "ground" to earth ground or if I should keep it floating in the first place?
Interestingly the manual does not discuss earth ground at all and how to properly connect it. Any recommendations?