Did you mean that when the shield is grounded it will have ground potential and therefore EMI will not will induce voltages in the shield?If you do not ground the shield, EMI will induce voltages in the shield which will also be seen on the signal owing to the capacitance effect of the coaxial cable.
It is indeed another story,& an incorrect one!The shield acts as a Faraday cage and prevents EMI from reaching the internal signal wire.
If you do not ground the shield, EMI will induce voltages in the shield which will also be seen on the signal owing to the capacitance effect of the coaxial cable.
(Note that the shield should be grounded at one end only in order to prevent current loops in the shield... but that's another story).
Beautifully simple answerThe shield acts as a Faraday cage and prevents EMI from reaching the internal signal wire.
If you do not ground the shield, EMI will induce voltages in the shield which will also be seen on the signal owing to the capacitance effect of the coaxial cable.
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You can have eddy currents in any conductive material, grounded or not grounded.To Mr chips. I enjoyed your post about Ground on July 5 2012. Did you mean that the EMI in the shield will NOT rise or fall above ground. In a shielded coax cable will there still be eddy CURRENTS even though the outer shield is grounded?How is it a block to the ELECTRIC FIELD? Thanks a million!
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