Haefely IP4B Capacitive Coupling Clamp

IEC 61000-4-4 establishes a common and reproducible reference for evaluating the immunity of electrical and electronic equipment when subjected to electrical fast transient/bursts on supply, signal, control and earth ports. The EFT test method documented in IEC 61000-4-4 describes a consistent method to assess the immunity of an equipment or system against a defined phenomenon. The standard gives specifications for laboratory and post-installation EMC burst test procedures. IEC 61000-4-4 defines: - Test voltage waveform - Range of test levels - Test equipment - Verification procedures of test equipment - Test set-up - Test procedure   Get the Standard   EFT Test Background Electrical Fast Transients (EFT) are caused anytime a gaseous discharge (a spark in the air or other gas) occurs, the most common being the opening of a switch through which current is flowing. As the switch is opened, arcing occurs between the contacts; first at a low voltage and high frequency while contacts are close together, and later at a higher voltage and lower frequency as the contacts become separated. Coupling of the EFT into electronic products occurs when power cables handling high currents are run near power, data, and/or I/O cables. EMC test engineers perform an EFT test ensure their continued reliable operation if subjected to realistic levels of fast transients. The European Union’s EMC Directive mandates EFT testing for virtually all electrical and electronic products as a condition for obtaining the CE Mark before shipping to a member state of the European Union.   EMC Burst Test Standards Generic Immunity, Product and Product Family Standards require that EFT tests be performed in accordance with Basic EMC Standards: IEC 801-4, IEC 61000-4-4 or EN 61000-4-4. Thermo KeyTek's Application Note, "EMC Standards Overview," provides an overview of European Standards for electromagnetic compatibility,