Preventing Dangers of Inadequate EMI Filtering

Electromagnetic interference (EMI) is an unwanted electromagnetic disturbance that occurs when electromagnetic radiation emitted from one electronic device affects another. Since every electronic device, including motors, power supplies, and microprocessors generates some level of electromagnetic energy, and every device is sensitive to it, electromagnetic energy from one device (the source) can affect the electric circuit of another (the victim), which can cause a variety of problems for the victim device, including signal interference, data loss, and reduced performance. This makes it essential that you protect critical equipment from electromagnetic interference. In this article, we’ll take a deeper look at the dangers of inadequate EMI filtering, as well as prevention strategies that you can implement to protect your devices from interference.

Dangers of Inadequate EMI Filtering

EMI filtering has become increasingly important to protect sensitive electronic systems. Just a few of the dangers that inadequate EMI filtering can cause include:

• Equipment failure. Without proper EMI protection, sensitive equipment can start behaving erratically or even stop working. This can be particularly hazardous to sensitive aviation, medical, and military equipment.
• Data loss. Inadequate EMI filtering can also cause erratic behavior in electronic systems, which can result in sudden equipment shutdowns and even data loss.
• Compliance failure. Without proper protection from electromagnetic interference, your systems may violate electromagnetic compatibility (EMC) standards set by organizations like the International Electrotechnical Commission (IEC). This could result in failed certification, product recalls, and/or costly redesigns.
• Reduced system lifespan. Long-term exposure to EMI can stress sensitive equipment over time, leading to premature aging and reduced lifespans of costly equipment.

Prevention Strategies

While EMI can’t be eliminated, the good news is that there are steps that you can take to reduce the effects of EMI on your equipment. A few ways that you can reduce electromagnetic interference include:

• Shielding. Enclosing sensitive equipment and circuits in a metal enclosure, such as a Faraday cage, can help shield this equipment from interference and ensure system performance.
• Grounding. Ensuring that all equipment is properly grounded can also go a long way in reducing EMI. Using high-quality, single-point grounding can isolate noisy sections and help protect circuits from interference.
• EMI filters. One of the best ways to prevent interference is with EMI filters. EMI filters combine capacitors and inductors to block unwanted frequencies from entering or leaving a circuit, which helps protect system performance while blocking unwanted signals.

EMI Filters From Captor Corp

Using EMI filters can go a long way in protecting your equipment from interference. However, it’s imperative that you choose high-quality filters that you can rely on to reduce external electromagnetic noise and improve device performance. As experts in the field of electromagnetic interference, Captor Corporation is committed to developing superior quality EMI filter solutions that you can depend on to protect your equipment. Whether your application involves signal, tempest, or power interference, our skilled team can help identify the most appropriate filter to meet your needs from our broad selection of durable, reliable, off-the-shelf EMI filters.

We also know that off-the-shelf solutions aren’t right for every customer, which is why our team of EMI experts is ready to help build custom EMI filters to meet your unique needs. Having completed over 10,000 custom filter designs, Captor Corp is one of the leading suppliers of custom EMI filters. Feel free to contact us today to learn more about our products, services, and how our high-quality EMI filters can help protect your equipment.

Top 5 Mistakes in EMI Filter Placement and How to Fix Them

When installing a filter to mitigate electromagnetic interference (EMI), there are some critical EMI filter mistakes to avoid. This guide will go over some of the most common mistakes and how to prevent them from reducing the effectiveness of an EMI filter replacement or new installation.

Input and Output Trace Coupling

One of the main EMI filter mistakes involves placing input and output wires beside or in close proximity to each other, which could limit the filter’s ability to effectively filter out EMI noise. Keeping input and output wires separate will enable reliable filtering. Also, separate control wires from power wires to prevent them from running parallel.

If needed, you can install shielding over wiring to further mitigate the risk of interference from radiated noise.

Poor Grounding/Bonding

Improper grounding and bonding to host equipment can present safety issues while also limiting the efficiency of EMI filter replacements.

When installing your EMI filter, the housing of the filter should maintain direct metal-to-metal contact with the surface it is to be mounted on, ensuring all surfaces are conductive without any insulation, including paint.

If you are using a cabinet or housing made of another material, ground the filter using an incoming safety wire with a short length, and use a flat braid design for any connections coming into contact with metal materials on cabinet frames.

When grounding your EMI filter, remember the difference between a safety ground and an EMI system ground. A safety ground uses a conductor or connection to enable currents to easily travel when a circuit fault occurs, which is why you need something other than a conventional safety ground for these types of systems involving high frequencies.

Here are some additional tips for grounding your EMI filter:

• Flat wires and other types of low-impedance connections can mitigate high-frequency interference more effectively than round wires.
• Ground connections must be of minimal length, but you can maximize surface area with braided and flat connections.
• Remove any paint present on cabinet mounting surfaces to further minimize impedance.
• Remain compliant with all safety regulations, adhering to industry guidance for safe grounding practices.

Incorrect Placement Relative to Noise Sources

Again, make sure the input and output wires have sufficient shielding to prevent interference between them. Generally, when placing your EMI filters, they should be in a location where energy is unable to couple onto pre- and post-filtration locations.

Keep in mind that filters and feedthrough capacitors feature designs for mounting within wall penetrations.

High-Frequency Noise Leakage

Inadequate installation will also permit high-frequency noise leakage. Installing EMI filters close to power entry points, keeping input and output wires away from each other, and minimizing the impedance of ground connections will help prevent noise from getting through and causing interference.

Implement low-leakage EMI filters to simplify grounding and insulation and reduce overall reliance on shielding.

Ignoring Component Coupling/Shielding

Another factor to consider is coupling and shielding. You can keep noise from coupling with wires and other components by routing wires beside the metal surfaces of the cabinet. If needed, add shielding to wires to reduce the risk of radiated noise from interfering with input wires, and make sure both ends of the shielding terminate when they reach the end of the cable to mitigate the risk of leakage at either end.

Contact the Experts at Captor Corp for Reliable EMI Filters

By avoiding these EMI filter mistakes, you can benefit from a high-quality filtering system that keeps equipment working optimally with little to no interference.

If you need high-quality EMI filter replacements for your systems, Captor Corp offers some of the most reliable EMI filter solutions available. If you need protection from power, signal, tempest, or another type of interference, we will match you with the right product.

For more information about our versatile EMI filter products and capabilities, submit a request for information on our website, or contact us today to speak with one of our EMI filtration experts.