The KEMA 801B replaces KEMA 801A and is recommended as an additional decoupling network (ferrite tube clamp) for immunity test according to IEC/EN 61000-4-6 when using the clamp injection method. It shall be inserted on all the cables between EUT and AE except the cable under test. The KEMA 801B prevents, that the test signal applied to the EUT affects other devices, equipment or systems, which are not under test and improves the reproducibility of the test results.