Hi @moto and @Claudio, thanks for sharing, I’d not seen before. Yes, I think the approach in the PDF looks very solid and well reasoned. I’d note on page 3 the BNC shroud should NOT be shorted to the housing. The lower housing has a good connection to the USB ground via press-fit 3mm screw bosses. The upper housing does not (due to paint). And while all the BNC shrouds are tied together, you should measure an “open” with your DVM between a BNC shroud and the USB shell (which is USB ground, and that turns into earth ground on a PC when plugged in).