Shielded Wire for Speed/Ref Sensors
07-21-2011, 01:56 PM
#16
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More shielded cable details:
Typically foil shielding has 100% coverage while braided shielding has about 90 to 95% coverage, which is not a problem except for very high frequencies (determined by gap size in the shield).
There is a big difference in mechanical performance. If a foil shielded cable is bent or twisted, especially multiple times, the foil can open up and create large unshielded spot(s), while braided shields are much more stable (does not open up).
If torsional stiffness is a problem, then served (helical) shields can be used, but it also is a bit unstable with respect to uniform coverage.
So as “JohnKoaWood” says (but with slightly different reasoning), foil shielding is mostly used for static installations and the other slightly more expensive solutions are best for dynamic (moving/vibrating cable) solutions.
Laust
Typically foil shielding has 100% coverage while braided shielding has about 90 to 95% coverage, which is not a problem except for very high frequencies (determined by gap size in the shield).
There is a big difference in mechanical performance. If a foil shielded cable is bent or twisted, especially multiple times, the foil can open up and create large unshielded spot(s), while braided shields are much more stable (does not open up).
If torsional stiffness is a problem, then served (helical) shields can be used, but it also is a bit unstable with respect to uniform coverage.
So as “JohnKoaWood” says (but with slightly different reasoning), foil shielding is mostly used for static installations and the other slightly more expensive solutions are best for dynamic (moving/vibrating cable) solutions.
Laust
