The three stage circuit is ideal for applications where the highest possible attenuation is required (eg. The two stage circuit is ideal for applications where higher attenuation is required (very noisy environments). The single stage circuit is ideal for general applications. This range of RFI filters are used to attenuate EMI in 240VAC single phase electrical systems. For conducted RFI, you can choose from a large range of RFI filters as follows: RFI filters are available as feedthrough components, or as PCB filters, IEC inlet filters and power entry modules, single phase filters, 3-phase filters, 3-phase and neutral line filters, output filters, EMC/EMI chokes and pulse transformers.ĭepending on your application, there are many ways to reduce the effects of RFI. What are the different types of RFI filters For radiated RFI, you can choose from a large range of shielding products. For conducted RFI, you can choose from a large range of RFI filters, chokes & pulse transformers. Since most machines have control electronic circuits, they may become difficult to control or unreliable.ĭepending on your application, there are many ways to reduce the effects of RFI. RFI can wreak havoc with your electronics, computers and telephones, making your workplace difficult to work in. If you are occasionally experiencing interference with your telephone system, flickering computer monitors, reliability issues with computer networks, instrumentation errors, or misbehaving electronics you are most likely experiencing RFI in your electrical environment. What are the effects of RFI in your electrical system? Electromagnetic disturbances occur as conducted interference as well as radiated emissions and immunity problems.īasics in EMC & Power Quality (download booklet) In other words, EMC deals with problems of noise emission as well as noise immunity of electronic and electrical products and systems. The electronic or electrical product shall not generate electromagnetic disturbances, which may influence other product'. There are many pieces of equipment that can generate RFI, variable frequency drives included.ĮMC (Electromagnetic Compatibility) means nothing more than 'an electronic or electrical product shall work as intended in its environment. Conducted RFI is unwanted high frequencies that ride on the AC wave form. The source may be any object, artificial or natural, that carries rapidly changing electrical currents, such as an electrical circuit or the Sun. The disturbance may interrupt, obstruct, degrade or limit the effective performance of the circuit. RFI is a disturbance that affects an electrical circuit due to either electromagnetic conduction or electromagnetic radiation emitted from an external source. Although the terms EMI and RFI are often used interchangeably, EMI is actually any frequency of electrical noise, whereas RFI is a specific subset of electrical noise on the EMI spectrum. EMI (Electromagnetic Interference) is also called RFI (Radio Frequency Interference).
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