IEC 62153-4-9:20 18 RLV包含国际标准及其红线版本。红线版本只有英文版本。Redline版本为您提供了一种快速简单的方法来比较该标准与其前一版本之间的所有变化。红线版本不是IEC官方标准，只有标准的当前版本才被视为官方文件。 IEC 62153-4-9:20 18适用于金属通信电缆。它规定了确定屏蔽平衡电缆耦合衰减aC的测试方法。由于同心外管，测量与圆周上的不规则性和外部电磁场无关。宽动态和频率范围可用于使用正常仪器测试超屏蔽电缆，从低频到外部电路中定义的横波极限（约4 GHz）。然而，当使用巴伦时，上限频率受到巴伦特性的限制。可以根据IEC 62153-4-4使用标准试管程序（分别使用标准测试头）或使用开放试管（开放测试头）程序进行测量。 本文描述的测量耦合衰减aC的过程基于根据IEC 62153-4-4测量屏蔽衰减的过程。这第二版取消并取代了2008年出版的第一版。本版构成技术修订版。与上一版相比，此版本包括以下重大技术变更: -两种测试程序，开放头部和标准头部程序； -分别用巴伦或多端口混合模式VNA进行测量； -频率范围扩展至2GHz及以上。

IEC 62153-4-9:2018 RLV contains the International Standard and its Redline version. The Redline version is available in English only. The Redline version provides you with a quick and easy way to compare all the changes between this standard and its previous edition. The Redline version is not an official IEC Standard, only the current version of the standard is to be considered the official document.

IEC 62153-4-9:2018 applies to metallic communication cables. It specifies a test method for determining the coupling attenuation a_C of screened balanced cables. Due to the concentric outer tube, measurements are independent of irregularities on the circumference and external electromagnetic fields. A wide dynamic and frequency range can be applied to test even super screened cables with normal instrumentation from low frequencies up to the limit of defined transversal waves in the outer circuit at approximately 4 GHz. However, when using a balun, the upper frequency is limited by the properties of the balun. Measurements can be performed with standard tube procedure (respectively with standard test head) according to IEC 62153-4-4 or with open tube (open test head) procedure.
The procedure described herein to measure the coupling attenuation a_C is based on the procedure to measure the screening attenuation a_S according to IEC 62153-4-4. This second edition cancels and replaces the first edition published in 2008. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
– two test procedures, open head and standard head procedure;
– measuring with balun or with multiport respectively mixed mode VNA;
– extension of frequency range up to and above 2 GHz.