The reason airlines ask passengers to shut down their mobile electronic devices during takeoff and landing also involves RFI. The Federal Aviation Administration has been concerned that mobile devices could produce enough RFI to disrupt a plane's electronics, including avionics and GPS systems, leading to safety issues. RFI is sometimes harmful to electronic equipment and equipment components.
It can cause parts to degrade and may eventually lead to catastrophic equipment failure. Additionally, it increases expenses by necessitating costly repairs and can lead to equipment downtime, data losses, and electrical disasters.
Generally, RFI can arise in several different ways. In interconnected wiring inside the equipment, RFI sometimes occurs in response to impedance opposition due to the current or voltage variances within conductors. Externally, RFI may come from solar flares, telephone or power lines, and other electrical equipment or power cords.
RFI also breaks down into two additional categories — narrowband emissions and broadband emissions. What are typical sources of electromagnetic interference within a piece of electronic equipment? Before you understand how to prevent EMI, you should know more about the causes of RFI so you're prepared with the correct solutions.
Below are a few of the most common causes of RFI in electronic equipment:. When you're working with power supplies and other electrical equipment susceptible to RFI, you need dependable ways to identify the source of the RFI in your operations so you can control and mitigate its effects.
To do so, you'll need to know where to look. Check these common sources of RFI to see where the interference may begin:. If you need to locate the specific source of RFI, you can try a few different options.
One is to pan a directional antenna around the location and scan for the interfering signal. Another is to use radio direction-finding RDFing equipment to locate the source of the interference. These devices usually come in mobile, fixed, and portable options for your convenience. You can also use a step attenuator, which gives you a higher degree of control over the signal strength indicator as you near the RFI source.
No matter the cause of the interference, electrical equipment requires effective solutions for controlling and reducing EMI and its harmful effects.
Let's discuss some of the strategies on how to prevent EMI so you're prepared correctly for your situation. Controlling and minimizing RFI depends on two primary factors. Your facility will likely need to use some combination of these techniques to reduce RFI effectively:. An RFI filter's design enables it to reject specific frequencies or types of interference within a power line or signal.
RFI or EMI filters are standard in many commercial, industrial, and residential applications involving electrical equipment and appliances. Here are a few, as follows:. Guides Share:. Select From Over , Industrial Suppliers. Receive Daily Industry Updates. Search Over 6 Million Products.
Your Power Partner. Visit Mouser. IEC Inlet Filters. Inverter EMI Filters. Military EMI Filters. Tempest Filters. The disturbance may interrupt, obstruct, degrade or limit the effective performance of the circuit. The source may be any object, artificial or natural, that carries rapidly changing electrical currents, such as an electrical circuit or the Sun. There are two types of RFI. Radiated RFI is emitted through the air. There are many pieces of equipment that can generate RFI, variable frequency drives included.
EMC Electromagnetic Compatibility means nothing more than 'an electronic or electrical product shall work as intended in its environment. The electronic or electrical product shall not generate electromagnetic disturbances, which may influence other product'. In other words, EMC deals with problems of noise emission as well as noise immunity of electronic and electrical products and systems.
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