Do you know how to test shielded cables?

I. Shielded cable test methods understand? Measurement of shielded cable shielding attenuation method has two methods: leakage method and penetration method.1. Leakage method is to generate a strong electromagnetic field in the coaxial cable, due to the cable shielding is not good enough, the cable inside and outside the conductor of the strong electromagnetic field between the conductors can be leaked through the gaps in the outer conductor. Measure the leakage field strength to characterize the shielding attenuation of the cable, the absorption clamp method is used in the leakage method. 2. penetration method is to be measured in the cable in the uniform electromagnetic field, due to the cable's outer conductor has a gap, the electromagnetic field penetrates through the gap to the cable inside, measuring the penetration field strength can also characterize the shielding attenuation of the cable. With the development of electromagnetic compatibility measurement equipment, can produce a uniform transverse electromagnetic field of the GTEM room to measure the shielding attenuation of the cable. This measurement method is called GTEM chamber method, belongs to the penetration method, more complex than the absorption clamp method. However, the measurement range of the GTEM chamber method is DC-1GHz, which is wider than the absorption clamp measurement range. Theoretically, the GTEM chamber can produce electromagnetic field strength is only related to the input signal power, as long as the power amplifier is large enough to produce a very high field strength. This makes the GTEM chamber much more sensitive for measuring shielding attenuation.

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