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Technical Centre
EMC/EMI Filters FAQ
Select question from the list below or return to faq categories.
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How does an input EMI filter work?
Input EMI filters use LC networks (inductors and capacitors) to block and divert high‑frequency switching noise, ensuring regulatory compliance and safety—click below to view design details, component roles, and standards.
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How do I select an external EMI filter for use with a power supply?
Need extra EMI filtering? Learn how to choose the right filter—input voltage/current ratings, derating, attenuation at problem frequencies, earth‑leakage/medical options, surge protection, and practical test‑house tips.
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How to select a line filter to reduce input transients
Protect systems from damaging line transients by selecting EMI filters with proper voltage/current ratings and pulse‑clamping features—discover when amorphous‑core filters, surge arrestors, and derating considerations are required.
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What are the Safety Standards for EMI/EMC filters?
EMI/EMC filters follow region‑specific safety standards—EN 60939 (EU), UL 1283 (US), CSA C22.2 (Canada); certifications (cULus, TUV, VDE) and marking rules vary. Learn compliance implications and testing details.
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Are EMI and EMC filters the same thing?
EMI and EMC filters both address unwanted noise and immunity, but serve different roles (emitter vs victim); effectiveness depends on filter design and standards—click to view comparison.
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How to Specify Low Leakage Current EMI/EMC Filters for Power supplies
Need to meet strict leakage‑current limits? Learn to size low‑leakage EMI/EMC filters: calculate budgets, compare filter leakage/ratings and attenuation, and select compliant options for medical and IT systems. View full guidance.
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