Advantech ADAM-5550KW Series, Руководство пользователя

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Appendix B Grounding Reference
B-12 ADAM-5510KW Series User’s Manual
Figure B-10: Double isolated cable
• Double isolated cable Figure 10 is an example of a double
isolated cable. The first isolating layer of spiraled aluminum foil
covers the conductors. The second isolation layer is several
bare conductors that spiral and cross over the first shield layer.
This spiraled structure makes an isolated layer for reducing
external noise. Additionally, follow these tips just for your
reference.
• The shield of a cable cannot be used for signal ground. The
shield is designed for carrying noise, so the environment noise
will couple and interfere with your system when you use the
shield as signal ground.
• The higher the density of the shield - the better, especially for
communication network.
• Use double isolated cable for communication network / AI / AO.
• Both sides of shields should be connected to their frame while
inside the device. (for EMI consideration)
• Don’t strip off too long of plastic cover for soldering.