Home›Knowledge›Solving EMC problems
Guide · The overview
Understanding EMC problems — and solving them systematically.
EMC problems show up as unstable signals, communication errors, unexpected behavior or a limit value exceeded during testing. The good news: they usually have a few, clearly localizable causes.
How EMC problems arise
Typical roots are an unfavorable PCB layout, missing or inadequate shielding, unsuitable cable routing and connectors, as well as high switching frequencies and fast signal edges. Interference is coupled capacitively, inductively, as a wave through the air or conducted via cables.
How we proceed
- Reproduce: first measurable, then solvable — in a pre-compliance setup.
- Localize: find the cause, not the symptom (grounding, shield, filter, software).
- Prioritize: the one or two most effective levers first.
- Verify: secure the measure in the fully-anechoic chamber, with documented margin.
When external help makes sense
When a deadline or start of series production is under pressure, a fast, experienced root-cause analysis usually saves more than it costs.
Frequently asked questions
What are the most common sources of EMC problems?
Grounding concept and return-current paths, shield termination (pigtails), filter placement, cable routing and clocked software. Details in the layout guide.
Can EMC problems still be solved after the fact?
Usually yes — through targeted measures on grounding, shielding, filtering or installation. The earlier, the cheaper; in a production device it becomes more involved. See EMC troubleshooting.