Troubleshooting EMI Like a Pro

Expensive EMC simulation software isn't always necessary for practical troubleshooting. Discover how free SPICE tools can effectively tackle filter design, validate test setups, and solve real-world EMI problems—without the steep learning curve.

This article explores a radiated emissions case where unexpected high-frequency noise appeared on low-speed I/O lines. The author discusses how power distribution network design issues can cause emissions problems and shares strategies for improving EMC performance through proper PCB layout.

Got a noisy power system? This real-world EMI investigation reveals how seemingly minor grounding issues between compartments can create major interference problems - and shows how smart measurement techniques led to an elegant fix.

This Column discusses a technique for troubleshooting radiated immunity failures in electronic devices using near-field probes. It presents a case study, explains the method's application, and addresses its limitations and safety considerations for bench-level testing.

When traditional EMC troubleshooting tools fall short, the reciprocity theorem can reveal hidden immunity problems. This real‑world case study shows how unexpected RF sources—like walkie‑talkies—can expose susceptibility paths, helping engineers diagnose failures and strengthen designs with simple, effective fixes.

In large systems, such as big cabinets housing numerous electronic components, employing the near-field probe method can be time-consuming and, depending on the voltage level, potentially unsafe (for instance, when dealing with high-voltage circuits requiring isolation). In such scenarios, an alternative approach is necessary.

Developing electric vehicle components or drone systems? Learn how to set up an affordable benchtop conducted emission test during R&D. This pre-compliance approach helps engineers catch design issues early, avoid costly fixes, and gain insights into radiated emissions—all before formal testing begins.

Power supply manufacturers often struggle with resonance peaks in conducted emission tests that filtering can't eliminate. Learn how to locate noise sources using RF current probes and near-field probes, plus effective mitigation strategies.

Don't let your benchtop spectrum analyzer become an expensive paperweight. These four essential tips will help you avoid common mistakes that damage equipment, improve your EMI measurements, and spot hidden noise sources during troubleshooting work.

Engineers can now reproduce expensive bulk current injection (BCI) test failures using a simple homemade "flying" probe with capacitive coupling. This cost-effective alternative enables pre-compliance EMC immunity testing in any lab, helping identify and fix automotive module communication issues without specialized high-power equipment.