What is BS IEC 62153-4-6 - Metallic cables and other passive components test methods about?
BS IEC 62153 is a series on metallic cables and other passive components test methods. Metallic cables and other passive components test methods are used to bear mechanical loads or electricity and telecommunication signals. BS IEC 62153-4-6 determines the screening effectiveness of a shielded metallic communication cable by applying a well-defined current and voltage to the screen of the cable and measuring the induced voltage in order to determine the surface transfer impedance. Measurements in the frequency range from a few kHz up to and above 1 GHz can be made with the use of normal high-frequency instrumentation.
Who is BS IEC 62153-4-6 - Metallic cables and other passive components test methods for?
BS IEC 62153-4-6 on metallic cables and other passive components test methods is useful for:
- Telecommunication component manufacturers
- Telecommunication equipment manufacturers
- Design engineers
- Quality control personnel
Why should you use BS IEC 62153-4-6 - Metallic cables and other passive components test methods?
Metallic cables and other passive components are commonly formed by drawing the metal through a hole in a die or draw plate. As shown in BS IEC 62153-4-6 the injection circuit is constructed as a transmission line using one or more parallel wires, a corrugated ribbon cable or a flat copper braid with the outer conductor of the cable under test. The injection circuit is connected to the coaxial line at each end via an injection feature. The injection wire is fitted tightly to the cable sample along the coupling length (e.g., with an adhesive tape). The characteristic impedance of the injection circuit is equal to the generator output resistance and the load resistance R1; this is achieved by choosing an appropriate conductor size and the type of insulation of the injection wire. The reflection coefficient of the injection feature and the injection circuit along the coupling length is less than 0,1 related to the generator output resistance, i.e., the return loss should be higher than 20 dB.
The recommended test length between the two injection features is 0,5 m for frequencies up to 1 GHz For an injection feature as described in BS IEC 62153-4-6, the CUT should be shielded with brass or copper tubes outside its test length. The shielding tubes will contact the cable screen S at E by soldering or crimping. If soldering is used, care is taken not to overheat the cable dielectric. A good practice is to choose the tube diameter such that the CUT can be inserted with the outer sheath removed and fixed by a standard crimping tool. The advantage of this method is that the cable braid S is prevented from unravelling near the test length of the CUT by the close positioning of the tube. Another possibility is the use of wedges to contact non-solder able aluminium foil/braid cables. Using BS IEC 62153-4-6 you can determine the screening effectiveness of a shielded metallic communication cable with the Line injection method.
