Meteoroid and debris shielding   EMI test 3915, 4.0 mm aluminium sphere, 7.2 km/s, 45 degrees 1.2 mm Al7075 bumper 49.5 mm spacing 3.3 Al7075 backwall   Assembly of an electronic box target. The image shows the printed circuit board (PCB) inside its aluminum housing with a sandwich panel and multi-layer insulation mounted on top of it.   Debris cloud resulting from the perforation of a sandwich panel (81.7µs after impact) EMI Test 4719.   Last update: 7 January 2013