EFT burst immunity test as per IEC61000-4-4:2012 EFT, BS EN61000-4-4:2012 immunity requirements applying to electrical and electronic apparatus intended for use in residential, commercial and light industrial environments as per BS EN61000-6-1:2007 & IEC61000-6-1:2005 EFT test for immunity on industrial environments as per BS EN61000-6-2:2005 & IEC61000-6-2:2005 EFT test for power quality analysers as per IEC61326-1:2012Electrical fast transient (EFT) testing is a conducted immunity test designed to subject an eut to a series of fast rise time and duration pulses to ensure compliance and meet product reliability requirements.
What is EFT in EMC ?
Within EMC EFT is a conducted immunity test designed to simulate a series of fast pulses, commonly called bursts, to evaluate the impact on the function of the EUT.
What is the EFT immunity test ?
The EFT immunity tests purpose is to ensure products are designed rugged enough to withstand fast transients commonly caused when an AC / DC connection is made or broken, equipment powered down, or circuit breakers switched.
Common causes of EFT
Inductive loads, such as relays, switch contactors, or heavy-duty motors when de-energized, produce bursts of narrow high-frequency transients on the power distribution system
Fast transients produced when the utility provider switches in or out the power factor correction equipment. Sparking that occurs whenever an AC power cord is plugged in, equipment is switched on/off, or when circuit breakers are opened or closed
Lightning strikes also produce EFT events. EFT transients are coupled to end equipment typically via power lines. Subway trains and electric buses impose large EFT surges onto the power grid and subsequently AC mains with their constant arcing. A common mistake in switching power supply layout is to have a big loop on the SMPS high switching current paths. This path must be heavy and as short as possible.
A Common Mistake In Switching Power Supply Layout Is To Have A Big Loop On The SMPS High Switching Current Paths. This Path Must Be Heavy And As Short As Possible. The Amount Of Energy Of EFT Events Is Around Several Hundreds Of Milli-Joules. Transient Events At These Energy Levels Can Corrupt Data Transmitted In Many Situations From Households To Industrial Environments; Therefore, A Good System Design Requires EFT Suppression
EFT test on household appliances, electric tools and similar apparatus as per BS EN55014-2:2015, EFT test on it and radio equipment as per CISPR24:2010. EFT test on medical equipment for basic safety and essential performance as per IEC60601-1-2:2007
What is EFT testing ?