Ett allt vanligare . fenomen är att mobil telekommunikation inte fungerar i moderna/nybyggda hus. Detta kan härledas till de moderna energisparfönster som monteras in. Denna skärmverkan är inte bara ett problem utan kan också vändas till en fördel i de fall man vill skydda verksamhet från yttre elektromagnetiska störningar, till exempel avsiktlig elektromagnetisk störning (IEMI), samt i de fall då man vill undvika att röjande strålning (RÖS) från elektronisk utrustning läcker ut och kan avlyssnas.
Not even the best software in the world works if the hardware doesn’t.
This article . is a summary of the Keynote Speech given by Michel Mardiguian and Ulf Nilsson at Electronic Environment Conference in 2016. The intention was to give an overview of what EMC is, how it influences an organisation and to motivate management to implement an EMC culture in their organisation.
Shielded cables: Their Role in Reducing EMI Susceptibilty and Emissions
This is the 5th article . of our ”EMC awareness” series. At this point, before addressing the coupling path, occuring from (or to) the power mains, it was in order to review a solution that is widely involved in controlling Conducted, Radiated and Crosstalk EMI situations: the use of shielded conductors. The subject is not that simple and requires some insight. This article will explain as clearly as possible for the non-specialist how a cable shield works, how much EMI reduction can be expected, and why the choice of certain cables or installation practices will result in mediocre results.
Sjukvårdens behov av säkerhet i en teknikintensiv miljö
Då en störning . definieras som en felfunktion eller frånvaro av funktion är det lätt att inse varför EMC-krav är en naturlig del av den elektromedicinska säkerheten. Det har tidigare funnits misstankar om att EMC-relaterad problematik inom vården är mer utbredd än vad vi som jobbar inom fastighetsförvaltning har haft kunskap om.
Ögat På: EMC från bricka till bricka, del 14
EMC måste . tas om hand i alla delar, både elektriskt och mekaniskt samt på alla nivåer i en utrustning, på ett systematiskt och planerat sätt. Figur 2 illustrerar problematiken som berör många discipliner (kanske flera leverantörer). Många frågetecken behöver rätas ut. Min erfarenhet är att alltför ofta har de inblandade konstruktörerna bristande kunskap om hur det förhåller sig.
Detection of Electromagnetic Interference at Critical Societal Functions
The use of wireless . technology has exploded in recent decades and has led to the fact that most individuals today use such technology in some form. This is also a general trend in other parts of the society, such as security and safety applications and for machine-to-machine (M2M) communication. We can also see rapidly increasing use of wireless technologies in critical societal functions such as energy production, transport, logistics, banking and financial systems, and industrial and security applications. This despite the fact that civilian wireless technologies are very sensitive to electromagnetic interference signals.
Tyst kunskap inom EMC
Inom kunskapsteori . brukar man skilja på två typer av kunskap; explicit respektive implicit kunskap. Det talas ibland om så kallad tyst kunskap. Vad innebär tyst kunskap inom EMC?
A Review of the principal EMI Coupling Paths – The key to understanding and preventing or solving EMI problems Part 2
Radiation Paths and cable-to-cable coupling . This is the 4th article of our EMC awareness series. The former articles, after a broad overview of the EMC subject, reviewed the principal Civilian and Military Norms and test methods, insisting on the legal inforcement of these verifications in Europe, where they are turned into mandatory, « must-comply » laws. Given that source/coupling path/victim concept is the basic approach to EMC, most of the time it is the coupling path between the culprit source and the victim equipment wich is the crux of the problem, hence of its solutions. The 5 essential coupling mechanisms were listed, by which EM Interference take place. Although any equipment can be alternately the victim, or the source, of an EMI problem, we focused on EM susceptibility as being the manifestation that appears first in the designer’s or field engineer’s worries.
Drivkrafterna för EMC-marknaden
EMC-området . fortsätter att utvecklas i takt med den övriga industriutvecklingen. Nya elektroniska produkter måste möta olika slags EMC-krav varför EMC-ingenjörer ständigt möter nya utmaningar som måste lösas.
Measurement Method for Determining Shielding Effectiveness of Cable Feedthroughs
An efficient and repeatable measurement method for determining shielding effectiveness of cable feedthroughs based on the use of nested reverberation chambers is presented. The measurement method is validated by comparing measurements on an isolated conductor penetrating the shield with a simple theory based on basic circuit theory in combination with antenna theory. The agreement between measurements and simulations is very good in the considered frequency range 400 MHz to 4 GHz. Measurement results for commercially available cable feedthrough are also presented.