Carlon Structured Cable Management Systems Handbook - Low Res - Manual (Page 40)

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modifications to make it less productive of EMI?
Is the source properly grounded? Is it shielded, that is,
surrounded by a metallic enclosure that can block radio
waves? If not, can one be added, if so, can it be
improved? Can the source be isolated, for instance
with an isolation transformer, or with a commercially
available power-conditioning device?
Many of the same approaches apply to the victim as
well. Can the victim be moved farther away, or trans-
ferred to a different, separate circuit? Does the victim
need to be repaired, replaced or fitted with design
improvements or modifications to make it less vulnera-
ble to EMI? Is the victim properly grounded? Is it
shielded? If not, can shielding be added, or if so, can
the shield be improved? Can the victim be isolated,
with an isolation transformer, or with a commercially
available power-conditioning device? Can you replace
the wiring with a more EMI resistant type of wire?
Once you have found an effective approach, put the fix
into the installation in a permanent way. This is the
final step of the process.
FOR FURTHER INFORMATION
Many knowledgeable experts have written on the topic
of reducing EMI. Here are some suggested resources:
• Mardiguian, M., EMI Troubleshooting Techniques,
McGraw Hill, 1999.
• Ott, H., Noise Reduction Techniques in Electronic
Systems, Wiley-Interscience, 1976
• Morrison, R., Grounding and Shielding Techniques in
Instrumentation, Third Edition, Wiley-Interscience,
1986
• IEEE Industrial Applications Society, IEEE Guide for the
Installation of Electrical Equipment to Minimize Noise
Inputs to Controllers from External Sources, IEEE,
1982
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