IEC 60728-4:20 07适用于系统插座、分路器和分接头、无源单端口或多端口设备，包括滤波器、衰减器、均衡器、电流隔离器、电源注入器、电缆接头、端接电阻器和传输点，但不包括同轴电缆和接收器引线。本标准: -覆盖5MHz至3000MHz的频率范围； -确定某些参数的性能要求； -规定某些参数的数据公布要求； -规定测量方法； -引入定义质量等级的最低要求。这第三版取消并取代了2000年出版的第二版，构成了对第二版的技术修订。它包括以下重大技术变化:第3.1款包括几个新的或修改的定义。条款4包括增加了衰减、隔离、贯通损耗、群延迟变化、幅频响应和二阶和三阶产品的两个载波互调测量的测试方法。第5条包括更新的和新的性能要求。

IEC 60728-4:2007 applies to system outlets, splitters and taps, passive single or multiple port equipment comprising filters, attenuators, equalizers, galvanic isolators, power injectors, cable splices, terminating resistors and transfer points, but excluding coaxial cables and receiver leads. This standard:
- covers the frequency range 5 MHz to 3 000 MHz;
- identifies performance requirements for certain parameters;
- lays down data publication requirements for certain parameters;
- stipulates methods of measurements;
- introduces minimum requirements defining quality grades. This third edition cancels and replaces the second edition published in 2000, of which it constitutes a technical revision. It includes the following significant technical changes: Subclause 3.1 includes several new or modified definitions. Clause 4 includes added test methods for attenuation, isolation, through-loss, group delay variation, amplitude frequency response and two carrier intermodulation measurements for second- and third-order products. Clause 5 includes updated and new performance requirements.