What are Absorbing Clamps?

Absorbing Clamps are used in EMC testing to measure the disturbance power transmitted along cables, particularly in accordance with standards such as CISPR 16-1-3. These devices clamp around the cable under test and function as a combination of a current transformer and an RF absorber. The integrated absorbing material suppresses reflections and standing waves on the cable, allowing accurate measurement of the forward-traveling RF energy.

Key performance parameters of Absorbing Clamps include frequency range, coupling factor, insertion loss, and directivity. These clamps typically operate over frequencies from tens of megahertz up to several hundred megahertz. The coupling factor defines the relationship between the measured signal and the actual disturbance power on the cable, and calibration is required to ensure measurement accuracy. Maintaining consistent positioning of the clamp along the cable is important for repeatable results, as the measurement is sensitive to cable configuration and layout.

Absorbing Clamps are designed with a split-core or hinged structure for easy installation around cables of varying diameters. The internal RF absorbing material reduces reflections, ensuring that the measured signal represents the true disturbance power rather than a combination of forward and reflected waves. These devices are commonly used with EMI receivers or spectrum analyzers to capture and analyze the measured signals. Proper test setup, including cable routing and grounding, is essential to achieve valid and standards-compliant results.

Absorbing Clamps are widely used in EMC compliance testing, particularly for measuring conducted emissions on power and communication cables. They are applied in industries such as consumer electronics, automotive systems, industrial equipment, and telecommunications. Their ability to provide non-intrusive and accurate measurement of disturbance power makes them an important tool for EMC test laboratories and product validation.

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