Hi, I am a Reliability Engineer. Currently, I am facing difficulties in finding the root cause to a defective EMI filter bead. Resistance measurements across the four leads (vertically, horizontally, diagonally) show that they are all shorted. However, a good ferrite bead should only be shorted horizontally as tested. From the x-ray picture, I couldn't find any abnormality. It looks perfect with two wires running in parallel. I am hoping to find some explanation in the world of Physics? Thanks!