IEC 60939-2:2005+AMD1:2023适用于电磁干扰抑制的无源滤波器单元，其属于通用规范IEC 60939-1的范围。本分规范的范围仅限于适用于安全测试的无源滤波器单元。这意味着，当需要符合表3的强制性测试时，根据本分规范指定的过滤器将连接到主电源，或者在设备规范规定需要进行部分或全部安全测试的其他电路位置使用。

IEC 60939-2:2005+AMD1:2023 applies to passive filter units for electromagnetic interference suppression which fall within the scope of the Generic Specification IEC 60939-1. The scope of this Sectional specification is restricted to passive filter units for which safety tests are appropriate. This implies that filters specified according to this Sectional specification will either be connected to mains supplies, when compliance with the mandatory tests of Table 3 is necessary, or used in other circuit positions where the equipment specification prescribes that some or all of these safety tests are required.