What is the correct way to terminate a shielded cable? Should it be connected to earth ground at one end? What about the other end, leave it open? I was playing around with Radiated immunity tests -one end(close to EUT) of the cable was connected to earth and other end was left open. Interference was horrible. No better than a unshielded regular wire. I grounded the other end (to the same ground point) and a lot of the noise was gone. It was a short cable, say 3meters, sheilded (non-twisted). A lot of articles I have read, says ground the cable at one end. Otherwise it will result in a ground loop. So what do you do at the other end. How come the signals that interfere do not take the grounded path and still couple to the center conductor. Equivalent ckt diagram would help a lot.