IEC 62153-4-4 Metallic Communication Cable - Part 4-4: Electromagnetic Compatibility (EMC) - Test Method for Measuring Shielding Attenuation Up to 3 GHz and Above

Electromagnetic and Electrical Tests

IEC 62153-4-4 Metallic Communication Cable - Part 4-4: Electromagnetic Compatibility (EMC) - Test Method for Measuring Shielding Attenuation Up to 3 GHz and Above

EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of IEC 62153-4-4 testing. IEC 62153-4-4 describes a test method for determining shielding attenuation from metallic communication cable shields.

IEC 62153-4-4 Metallic Communication Cable - Part 4-4: Electromagnetic Compatibility (EMC) - Test Method for Measuring Shielding Attenuation Up to 3 GHz and Above

Thanks to the concentric outer tube, the measurements are independent of irregularities on the environment and the external electromagnetic field. A wide dynamic frequency range can be applied to test even super-shielded cables with normal instrumentation, from low frequencies to the limit of defined transverse waves in the external circuit at about 4 GHz.

This edition includes the following important technical changes from the previous edition:

  • Impedance matching adapters are no longer needed when measuring instruments have a different characteristic impedance than the characteristic impedance of the test equipment;
  • The reflection loss due to mismatch is taken into account with a (calculated) correction factor.

The offending or primary circuit is the mating wire under test. The degraded or secondary circuit consists of the outer conductor of the cable under test (or the outermost layer in the case of multi-shielded cables) and a solid metallic tube with the tested cable on its axis.

Voltage peaks at the far end of the secondary circuit should be measured. A compatible receiver is not required for this measurement. The expected voltage peaks at the far end do not depend on the input impedance of the receiver, provided it is lower than the characteristic impedance of the secondary circuit. However, having a low mismatch is an advantage, for example by choosing a range of pipe diameters for coaxial cables of various sizes.

At the far end, the sample under test should be terminated with a very well screened resistor (better screened than the screen under test) equal to the nominal value of the characteristic impedance of the sample under test. Termination can be done using several resistors in parallel. Connections between the terminating resistor, the shielding cap, and the cable shields must be made with care so that the contact resistance can be neglected when interpreting the results. Special care should be taken in the preparation of foil screens to avoid cracks in the foil that could cause errors in test results.

EUROLAB assists manufacturers with IEC 62153-4-4 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.

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