A Closer Look at Electromagnetic Interference (EMI)

What Is EMI?

Electromagnetic interference (EMI) is a phenomenon that occurs when the energy of one device interferes with another device. It can have an impact on the performance of devices, resulting in unexpected results or failure. These sources may be natural (such as lightning) or man-made (such as radio frequencies). 

The effects of EMI can range from minor to catastrophic depending on the severity of the interference and how it affects the equipment in question. Let’s take a closer look at EMI below.

Common Sources of EMI

One of the most common sources of EMI is power lines. Power lines can conduct strong electromagnetic fields that can interfere with nearby electronic devices, particularly those used in medical facilities or scientific laboratories. 

Other common sources of EMI include cell phones, computers, fluorescent lights, motors and generators. Electronic devices are not the only source of EMI; natural phenomena such as lightning strikes can also generate strong electromagnetic fields that can disrupt electronic equipment. 

Examples of EMI Effects

When two electronic devices come in close proximity to one another, they may experience problems due to EMI.

For example, if you were using a laptop near a television set or other electronic device that was producing high-frequency signals, your laptop might suffer interruption due to the interfering signals picked up by its internal circuits. 

How to Prevent EMI?

There are several ways to prevent or reduce the effects of electromagnetic interference.

These include using appropriate shielding materials around sensitive devices; using filters to block out unwanted frequencies; and making sure all cables are properly routed away from areas where they could be affected by radiation or other forms of energy.

Many modern electronics are designed with built-in shielding materials which help mitigate the risks associated with electromagnetic interference. 

Testing for Compliance

Electronic devices are everywhere; exposure to interference is inevitable. 

Electromagnetic compatibility (EMC) measures the ability of electronic products to tolerate interference without malfunctioning and causing harm.

Manufacturers should always EMC test a new product in order to prevent risk, meet regulations, and gain a competitive edge in their industry.

Looking to Test Your Product?

Look no further than Green Mountain Electromagnetics. We’re a reputable and professional laboratory providing quality and timely testing.

With 30 years in the industry, our team includes EMC experts equipped with the latest technology and knowledge to ensure reliable test results. GME is A2LA accredited and supports clients, developing long-term business relations.


Contact us today to find out more about our services!