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179 ADAM-5560 Series User Manual
Chapter B Grounding Reference
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.