the digital and analog PSU's grounds meet at a star grounding point. This point is in turn connected to the "chassis ground"/earth via a 100nF/50V capacitor as suggested by bwack. In addition, I have exposed earth on top of the PSU to be able to clip on my ESD wrist band.
|The DGND and AGND meet at a star point which is also connected to Earth via a 100nF cap (inside the shrink tube)|
|Earth is also connected to a point outside the box where I can attach my ESD wrist band|