Narda ELT-400 Exposure Level Tester | 1 Hz - 400 kHz

Directive 2013/35/EU of the European Parliament and the of Council of 26 June 2013, also known as the EMF Directive, defines the minimum health and safety requirements for protecting workers from exposure to electromagnetic radiation. The directive encompasses all known biophysical effects and other effects caused by electromagnetic fields, focusing on the short-term effects of excessive electromagnetic radiation on employees. Directive 2013/35/EU details requirements for worker information and training, maintaining formal exposure and risk assessments, health surveillance and more. The directive covers a frequency range of 0 Hz – 300 GHz and is applicable to all occupational sectors; its exposure limit values and action levels are identical to, respectively, ICNIRP 2010 and ICNIRP 2009. The directive covers two general levels of EMF exposure: sensory effects and health effects.   First Level: Sensory Effects 0 Hz – 10 MHz At this lower level of exposure, workers experience transient issues with their senses and minor fluctuations in brain functions. One common side effect is magnetophosphenes, flashes of light that impair the person’s vision. The directive’s safety margins are such that workers should never experience these side effects, which are the byproduct of electromagnetic energy interfering with the central nervous system. The directive defines limits for these symptoms called Sensory Effects Exposure Level Values (ELVs).   Second Level: Health Effects 100 kHz – 300 GHz The second, higher level of exposure directly threatens the health of personnel in the area by damaging their body and peripheral nervous system. This manifests as thermal heating that stimulates nerve and muscle tissue. The directive establishes limits for these symptoms called Health Effects ELVs. To avoid workers being exposed to either level of radiation, the standard calls for action levels (ALs) to be adhered to,

IEC 62233 describes measurement methods for determining electric field strength and magnetic flux density for household and other electrical appliances. The standard covers electromagnetic fields from 0 to 300 GHz.  Along with test methods, IEC 62233 describes ideal testing conditions as well as recommended measuring distances and positioning. Methods specified in this standard are valid over a frequency range of 10 Hz to 400 kHz; frequencies below 10 Hz and above 400 kHz are regarded as complaint without testing, unless called out in IEC 60335.   IEC 62233:2005 is the latest version of the standard.     Applies To: Household Electrical Appliances Electric Tools Electric Toys Does Not Apply To: Heavy Industrial Apparatus Vehicle-Specific Apparatus Cables, Fuses, Switches, Circuit Breakers Medical Appliances Personal Computers TV, Radio, Audio, Video Equipment Electronic Musical Instruments Radio Transmitters Differences Between IEC and EN Versions EN 62233 is the European standard for household appliances and is nearly identical to IEC 62233. The few differences between the two standards can be found in the exposure limit values listed in Annex B of both standards. EN 62233 limit values are identical to ICNIRP limit values, whereas its IEC counterpart offers both IEEE and ICNIRP values.   Choosing a Test Method When testing to IEC 62233, choosing the correct test method is essential to ensure your setup is right for the appliance being tested. Your device may require a time domain evaluation, a line spectrum evaluation or alternative test methods depending on its specifications. The following diagram will help you to choose how you test:   Time Domain Evaluation Regardless of the signal type, testers can perform time domain measurements of the value of the magnetic flux density. A transfer function "a" can be implemented to take into account the dependency on the frequency