GB/T 31723.405-2026 Metallic communication cable test methods—Part 4-5:Electromagnetic compatibility(EMC)—Screening or coupling attenuation—Absorbing clamp method

Scope

This document describes the absorption clamp method for determining the coupling or shielding attenuation characteristics of metal communication cables in the frequency range of 30 MHz to 1,000 MHz (2,400 MHz), depending on the performance of the absorption clamp. This method is an alternative to the triaxial method specified in IEC 62153-4-4 or IEC 62153-4-9. Since the external circuit of the absorption clamp method is not specified, the test results obtained at different locations and in different laboratories may vary, with variations even exceeding ±6 dB.

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