• Radiation coupling:
Electromagnetic waves emanate from the cable (antenna principle) a
result high transmission frequencies and “long” cable runs. The transfer impedance component screening parameter.
3.
Transfer impedance
The transfer impedance the ratio the induced interference voltage
between outer conductor and housings the interference current applied to
the screen.Hoods and Housings 57
• Capacitive coupling:
There permanent certain capacity between the cable conductors and the
connector housing, because these are adjacent circuits with variable
potential difference. This voltage current can superimposed transmission
signals. However the energy level usually low.4 EMC Properties
The screening effect housing can described terms the shielding
effectiveness factor and the coupling resistance Rc. specified logarithmic ratio and such
referred the shielding effectiveness ratio. Odd objects
can act unintentional receiver, causing interference voltage or
current. This potential difference may cause electrical current
to flow (through the air which insulates them), resulting disturbance
capacity.6.
Shielding effectiveness
The shielding effectiveness component defined the ratio a
power radiated within the component the maximum resulting interference
power outside the component the environment. This specified [dB] (VG
95214 standard). Vice versa, this definition
also applies the interference power within the component due external
interference sources.
(VG 95214 standard)
