Thank a guy named Jack from America for sharing BS EN 3475-806:2002,Aerospace series. Cables, electrical, aircraft use—Test methods.— Part 806: Attenuation.
BS EN 3475-806:2002 specifies methods for measuring the attenuation of a cable.It shall be used together with EN 3475-100.
Connectors shall be fitted on each end of the test specimens (coaxial cables) or the test specimens shall be stripped (balanced cables) and connected to the measuring device.
Measurement of attenuation is carried out by transmission in harmonic mode at the frequencies indicated inthe product standard, inserting a cable sample in a suitable circuit and by compensating the attenuation caused by this cable by means of a calibrated attenuator.
The attenuation constant shall be determined from the ratio of the input and output voltage or power. Both quantities may be measured in turn by a single measuring receiver or simultaneously with a network analyser or two channel powermeters.
In the case of a balanced cable,the measurement shall be carried out in a balanced condition. If the measuring test equipment is an unbalanced one, both ends of the pair shall be connected to the test equipment by means of baluns. The baluns shall be selected to match the test equipment to the cable nominal impedance at the test frequency.
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