The technique I use to measure PS ripple it's a kind of "special cable" that one side connects to the output of the power supply under test and on the other side (with the ground clip removed) I insert the probe on a soldered ground spring, the tip connects to a golden point on the pcb. 2 capacitors in parallel are added into the side where the probe connects. The two wires of this cable are twisted.
Aldo22 if you want to try this, beware with the capacitors operating voltage, the higher the better for safety reasons. You don't want to connect a 16V capacitor into a 60V PS
Edit: Don't forget the polarity of the 47uF electrolytic capacitor! minus connects to the black wire!
This video shows how I do it:
This video also shows differences in different techniques, but I prefer the previous for it's flexibility to allow connecting different outputs connectors without much effort by using this "special cable"