8.11 Electromagnetic compatibility

Outcome 11 of 12 in domain 8 · Systems, reading and designing a complete device

What a device emits, what it suffers, and how you keep it in check.

My targets

I declare:

Explain emission and immunity, conducted and radiated, and why a switching converter is the first suspect.
Design an enclosure’s shielding and grounds: chassis, shielded cables, where to bond the shield and where not to.
Put a mains filter and ferrites on a device and measure what it changes, on the oscilloscope or with an AM radio as detector.
Route for EMC: short loops, ground plane, decoupling capacitors, power traces away from signals.
Read the broad lines of what an EMC standard (ISED in Canada, FCC, CE) requires of a device you’d want to sell.
Diagnosis: a device that disturbs the radio or crashes when the compressor starts, find the path, conducted or radiated, and the remedy.