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Utveckling av laborationer i elektromagnetisk kompatibilitet
KTH, School of Information and Communication Technology (ICT).
2012 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Designing lab exercises in electromagnetic compatibility (English)
Abstract [sv]

Detta kandidatexamensarbete tacker amnet elektromagnetisk kompatibilitet, pa engelska Electromagnetic compatibility (EMC). Uppgiften var att konstruera ett laborationspass for hogskoleingenjorer som skulle behandla amnet EMC.

Elektrisk utrustning kan sanda ut elektromagnetiska storningar. EMC ar definierad som egenskapen hos en elektrisk utrustning att varken stora eller bli stord av andra apparater. En komponent som kan bidra med markanta storningar ar kabeln. En typisk kablar resonerar vid frekvenser mellan 30 MHz och 100 MHz. Beroende pa hur man jordar kabelskarmen sa kan man paverka hur mycket elektromagnetiska storningar systemet bidrar med.

Tva laborationsmoment har darfor konstruerats som studerar kabelns EMC egenskaper. Forsta momentet behandlar realistiska lagpassfilter och hur man tar hansyn till dess hogfrekvensegenskaper. Oftast ar det hogfrekvent brus man filtrera bort fran kablar men da ar det viktigt att filtret beter sig som tankt. Det andra momentet gar igenom olika jordningsmetoder for kabelskarmen och visar skillnaden mellan dessa. Med hjalp av en narfaltsprob samt en spektrumanalysator sa ska studenterna aven visuellt bekrafta magnetiska faltstyrkans avstandsberoende.

Rapporten inleds med en inledning till EMC, som tacker behovet av okad kunskap inom detta amne. Skrackexempel pa fall dar elektromagnetiska storningar kunnat ge forodande konsekvenser namns.

For att kunna konstruera ett pass inom EMC sa kravs kunskap fran omraden sasom vagrorelselara, teoretisk elektroteknik samt ellara. Darfor fortsatter rapporten efter inledningen med att tacka nodvandig teori inom dessa omraden. Formler presenteras i detta stycke och utnyttjas senare irapportens huvuddel.

I huvuddelen av rapporten foreslas ideer till experimenten. Analys, utforande, beskrivning och resultat av experimenten tacks aven i detta stycke och sammanfattas i ett senare stycke som ett labb-PM.

Sjalva labb-PMet kan ses som resultatet av rapporten. Labb-PMet kommer att ges till eleverna fore laborationstillfalle da en mangd forberedelseuppgifter ar givna. Forslag pa forkunskapsfragor presenteras i en bilaga i slutet av sjalva rapporten och ett urval av dessa anvands i labb-PMet. Labb-PMet har egna bilagor som beskriver hur man staller in matutrustning och hur man ska extrahera parametrar under laborationen. Dessa bilagor ska likt forberedelseuppgifterna lasas innan laborationstillfalle.

Slutligen i rapporten sa presenteras de referenser som utnyttjas i denna rapport i Vancouver-stil.

Abstract [en]

This bachelor thesis covers the subject electromagnetic compatibility (EMC). The task was to construct an EMC laboratory-exercise for students at the level of bachelor of science.

Electrical equipment can emit electromagnetic interference. EMC is defined as the ability of an electrical equipment to not interfere nor being interfered by other equipment. One component that can contribute with noticeable noise is the cable. A typical cable resonates within the frequencies 30 MHz to 100 MHz. Exactly how much interference a cable contributes with depends on how you apply ground to the cable screen.

Two main-exercises have therefor been constructed to study the EMC attributes of a cable. The first exercise covers realistic low-pass filters where the properties of the filter changes for high frequencies. It's often high frequency noise that you want to filter from cables so it's vital to know how the filters operates at these frequencies. The other exercise covers different methods to apply ground on a cable screen as well as the difference between the methods. With the help of a nearfield-probe and a spectrum analyzer the students are supposed to visually verify the distance dependance of the magnetic field.

The thesis begins with an introduction to EMC, which covers the need of increased knowledge within this subject. Here some worst-case-scenarios is given, describing what consequences faulty designed EMC apparatus can lead to.

In order to construct an EMC laboratory-exercise, basic knowledge of wave propagation theory as well as electrical theory is required. Thus this report continues after the introduction with necessary theory within these subjects. Formulas will be derived and will be used later in the main section of the report as well.

In the main section ideas for experiments are suggested. Analysis, execution, description as well as results of the experiments are covered in this part and are summarized in a later section as a lab-PM.

The lab-PM itself can be seen as the result of this report. The lab-PM will be given to the students before the day of experimentation, since a number of tasks are to be answered before they're allowed to begin experimenting. These prerequisite questions presented in the lab-PM are a selection out of a number of suggested tasks given in the appendix of this report. The lab-PM has its own appendix which is also to be read before the experiments, in order for the students to know how to extract necessary parameters.

The references used in this report is given with Vancouver style and is presented as a list in the last part of this thesis.

Place, publisher, year, edition, pages
2012. , 41 p.
Series
Trita-ICT-EX, 2012:36
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-97457OAI: oai:DiVA.org:kth-97457DiVA: diva2:533350
Subject / course
Electronic- and Computer Systems
Educational program
Master of Science in Engineering - Microelectronics
Uppsok
Technology
Examiners
Available from: 2012-06-13 Created: 2012-06-13 Last updated: 2012-06-13Bibliographically approved

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