Break the system into smaller sub-systems and analyze them individually, by disconnecting them as much as possible from the larger system. Leave the sub-systems physically at the same place as where the problem is. Then start EMC laboratory testing.

With nearly 10 years in medical X-ray imaging, I know how crucial it is to tackle EMI interference. Even small disruptions can lead to misdiagnoses or safety risks. I start by pinpointing the sources—like power supplies or high-speed data lines—then apply high-quality filters and shielding, such as Faraday cages, to block noise. I optimize the circuit layout, separating sensitive components and using ground planes to reduce noise. Spread-spectrum clocking helps further distribute interference. I ensure compliance with industry standards like CISPR 11 and 32, and use iterative testing with EMI scanners to refine the design. Ultimately, it’s about protecting patient care and ensuring the reliability of the technology we trust.

When I was doing very small signal measurements this was a common problem. Preferably if the system is small create an isolation system by creating Faraday Cage. In simple words just create a metallic enclosure for a full circuit. Only standard shielded communication cables should be used. This improves the signal to noise ratio significantly. For other complications you need to follow a system diagnostic approach and then identify, isolate and resolve the interference through methods mentioned here....

Tackling EMI in circuit design is a multifaceted challenge that requires a thorough understanding of EMI sources, meticulous design and layout planning, careful component selection, and rigorous testing. By adopting these strategies early in the design process, engineers can effectively mitigate EMI, ensuring that their electronic devices operate reliably in their intended environments without interference.

It heavily depends on your requirements and size. But in general for conducted interference you need to filter the noise at the source. As long as it travels on the line it can create new noises depend on the frequency, trace lengths and components on the way. For radiated interference it splits into two topic in my opinion. RF and non-RF. You need to filter the unwanted RF frequencies on the line before it reaches the antenna. For non RF part the key is shielding. These are the most basic ideas according to my experiences. Hope it helps.

Managing electromagnetic interference makes up a large number of different solutions at both the emitter and victim devices. Occasionally, it can be as simple of a fix as moving devices, so there is more space between the source and victim, or even rotating one device can do the trick. While the above fixes can get the job done, the better solution, in this case, includes the proper design of all equipment to minimise emissions and/or making the equipment less vulnerable to external interference. There are three different methods to help reduce or eliminate EMI: filtering, grounding, and shielding.

To tackle EMI interference head-on, I would implement a multi-faceted approach: Shielding: Use conductive materials to encase sensitive components, preventing external electromagnetic fields from causing interference. Proper Grounding: Ensure a solid grounding system to minimize noise and provide a path for unwanted currents to dissipate. Filtering: Incorporate EMI filters, such as ferrite beads and decoupling capacitors, to suppress high-frequency noise. PCB Layout Optimization: Design the PCB with shorter signal traces, rounded bends, and reduced vias to minimize EMI

Firstly, keep in mind and analyze the EMI. Then, add filtering circuit, and make perfect ground shielding. In addition, find the equipment to test the EMI. Finally, give the solution for improvement.

Analyzing each part of the system separately, applying tests, and observing their resulting behavior. Naturally, electrical problems are common, but it is necessary to pay close attention to the details, especially about EMI.

EMI can be prevented by shielding these cables and connecting them to the ground at the front and back. Fiber optic cables, including both single-mode and multimode types, offer the best protection against EMI because they transmit data as light signals, which are immune to electromagnetic interference unlike the electrical signals