Effect of gland quality on the screening effectiveness of cable-connector assemblies

Abstract

An extensive number of standards provide various transfer impedance requirements and test methods for individual cables, but just a few are related to connectors. Only two standards describe how to test cable-gland-connector-receptacle assemblies. The cable-gland-connector-receptacle assembly has significant effects on the total considered impedance chain. In general the supplier for cable, gland and connector is different. For the introduction of commercial off the shelf connectors tests were performed on connectors and cable-connector sets, and inconsistent results were observed, showing extremely high transfer impedance, thus poor screening effectiveness. It is shown that the transfer impedance of such glands is greatly dependent on its shape, and how glands are mounted.

Triaxial Cell for Determining Shielded Cable Transfer Impedance During Environmental Stress

“…Many methods have been used to characterize transfer impedance along the years, the most important ones being lineinjection [12], triaxial [13], and reverberation chamber [14] methods. A fairly recent listing of other methods can be found in [15]. While it has been shown that the line-injection method has the widest frequency range starting from DC [16], the triaxial method has been a go-to method for many practitioners due to its robustness and homogeneous field excitation.…”

Requirements with rationale and quantitative rules for EMC on future ships

“…The research on crosstalk was limited to the CM crosstalk itself, which can be translated to Differential Mode (DM) with mode conversion and compared with actual signal levels. In future research, the minimum needed transfer impedance Z t of cables and connectors for unbalanced interfaces should be further investigated, as started in [153], to achieve EMC without overprotection.…”