13-07-2011, 09:02 AM
Peter,
A good article. I would like to clarify one point though. The definition of
Electromagnetic Compatibility (EMC) is subtly different to that within the document. EMC is defined as the equipment will operate in its intended environment (railway is heavy industry with levels at 20V/m) and be suitable imune to emissions of other equipment operating in that environment as well as its own emissions being of a suitable level for that environment.
I would also suggest adding the design of CAT5 cable to show how the effects of cross-talk can be mitigated. Simply, the four twisted pairs are twisted at different rates with specific standards on how many of the twists can be unwound during installation plus cable length etc.
Earthing maybe a good addendum to this as well. Identification of how a poor earthing strategy can kill EMC and cause undesired behaviours.
Jerry
A good article. I would like to clarify one point though. The definition of
Electromagnetic Compatibility (EMC) is subtly different to that within the document. EMC is defined as the equipment will operate in its intended environment (railway is heavy industry with levels at 20V/m) and be suitable imune to emissions of other equipment operating in that environment as well as its own emissions being of a suitable level for that environment.
I would also suggest adding the design of CAT5 cable to show how the effects of cross-talk can be mitigated. Simply, the four twisted pairs are twisted at different rates with specific standards on how many of the twists can be unwound during installation plus cable length etc.
Earthing maybe a good addendum to this as well. Identification of how a poor earthing strategy can kill EMC and cause undesired behaviours.
Jerry
Le coureur