标准摘要
[中文适用范围]： IEC 62153的本部分适用于金属通信电缆。它规定了测定屏蔽平衡电缆耦合衰减aC的测试方法。由于同心外管，测量不受圆周不规则性和外部电磁场的影响。宽动态和频率范围甚至可以使用普通仪器来测试超级屏蔽电缆，从低频到外部电路中定义的横波极限（大约 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 使用标准管程序（分别使用标准测试头）或使用开放管（开放测试头）程序进行测量。本文描述的测量耦合衰减 aS 的过程基于根据 IEC 62153-4-4 测量屏蔽衰减 aS 的过程。 [外文原描述]： IEC 62153-4-9:2018 applies to metallic communication cables. It specifies a test method for determining the coupling attenuation aC 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 aC is based on the procedure to measure the screening attenuation aS 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.
英文名称Metallic communication cable test methods - Part 4 - 9: Electromagnetic compatibility (EMC) - Coupling attenuation of screened balanced cables, triaxial method