描述： Radiated Emissions testing of information technology equipment per CISPR 22, 1997 amendment 1, 2000-08 requires that all cables leaving the EUT for connection to auxiliary equipment outside the test site shall be filtered with a ferrite decoupling clamp placed on the cables at the point where the cables exit the test site. F-201-DCN-1-12mm Test Setup shows a typical test set-up for table top equipment taking particular detail to show the location of the ferrite decoupling clamps.
Fischer Custom Communications, Inc. has developed a family of ferrite decoupling tubes that combine high performance and small physical size. Even with their small size, the tubes meet or exceed the requirements of CISPR 22 amendment 1. The attenuation of the F-201-DCN-1-12mm is shown below and the dashed line shows the minimum performance required by CISPR 22, 1997 amendment 1 2000-08, which is 15 dB common mode attenuation.