1. With a long piece of copper or aluminum foil in the high frequency transformer outside the primary winding, wrapped around a circle, but the end can not touch (short circuit), with welding or tight way to lead to ground. Its inside and outside have an insulating layer, in its outside around the secondary winding.
2. With a diameter of 0.1 to 0.3 enameled wire close to a layer, one end empty the other end leads to ground. Its inside and outside also have an insulating layer, it's outside the secondary winding by high frequency transformer manufacturers .
The shield draws a reference point for a line to be grounded. Conventional shielding is done between the primary windings. Whether it is the outermost or inside the winding between the winding need to pay attention to: wrapped with copper foil winding, the copper head and tail overlap need insulation, the reason is simple: not insulated on the overlap is a short circuit of the coil!
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