它描述了IEC 61196-1:1995第14条《柔性射频电缆表面传输阻抗和屏蔽衰减极限指南》修订期间使用的重要背景材料。文中还给出了表面转移阻抗（ZT）与屏蔽衰减（as）之间的关系，并提供了ZT和as的测量结果，以显示200 MHz和500 MHz之间的平均屏蔽衰减与30 MHz和300 MHz下的ZT之间的相关性。

It describes important background material used during the revision of IEC 61196-1:1995, Clause 14, Guidance for surface transfer impedance and screening attenuation limits for flexible r.f. cables. It is also given the relationship between surface transfer impedance (ZT) and screening attenuation (as), also measurements of ZT and as are provided to show the correlation of mean screening attenuation between 200 MHz and 500 MHz and ZT at both 30 MHz and 300 MHz.