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A Crossword Just for EMC

 

ACROSS3) and 6) down. If the walls have ears in this judge’s room, don’t expect a reply 7) and 8) across. EHT can cause this to light up the dark8) See 7) across10) A heck of a lot of power, apparently12) The theme of this crossword13) Germany’s own version of 12) across14) A few billion of these involved in 7) across16) With 15 down the bible of EMC since 1970 18) Abbreviated … [Read more...]

Elephant in the Test Room #3 – Fixing the Broken Automotive Emissions Test Fixture

 

Read other posts in the "Elephant in the Test Room" series here.Please note, regarding the fate of Elephant #2 – ‘Disharmony in Harmonic Limits’, it has now fallen under the umbrella of ‘Linearization of EMC Amplifiers’ and will be alluded to again during the part of the design exercise that determines practical harmonic levels. And so, with no further ado, onto a whole new … [Read more...]

Elephant in the Test Room #2 Continued and The Design Guide Article

 

Read other posts in the "Elephant in the Test Room" series here.Elephant #2 - Disharmony in Harmonic LimitsThe Room: RF immunity testingThe Elephant: The curbing of the contribution made by harmonics to a calibrated test-field varies wildly from standard to standard, and within standardsThe Culprit: Harmonic limits that are seemingly not well thought through, and / or are open … [Read more...]

Training the Intern and Elephant in the Test Room #2 Continued

 

Read other posts in the "Elephant in the Test Room" series here.Elephant #2 - Disharmony in Harmonic LimitsThe Room: RF immunity testingThe Elephant: The curbing of the contribution made by harmonics to a calibrated test-field varies wildly from standard to standard, and within standardsThe Culprit: Harmonic limits that are seemingly not well thought through, and / or are open … [Read more...]

Elephant in the Test Room #1 Continued – Linearization of EMC Amplifiers

 

Read other posts in the "Elephant in the Test Room" series here.Recap On this ThreadThe room: MIL-STD RF immunity testing – 1-18GHz 200v/mThe elephant: everyone in the room is aware that a significant fraction of the ‘calibrated’ 200v/m test field is actually created at the wrong test frequency.The culprit: notoriously high ‘start of band’ harmonics produced by all octave band … [Read more...]

They’re Everywhere, They’re Everywhere – Part II

 

In part one of this post, I noted that there are three primary EMC coupling problems that are associated with the green wire safety ground: 1. The green wire conducted noise current modulates the signal and shows up as a differential voltage change across the load.2. The green wire forms a pick-up loop and acts like a magnetic field antenna.3. The green wire loop acts as a … [Read more...]

The First Practical Approach to EMC for Functional Safety (EMC Risk Management)

 

Keith Armstrong Cherry Clough Consultants Ltd. There are now many standards on Functional Safety (Risk Management) that apply to relevant electronics, including IEC 61508 [1] and the standards developed from it listed in Section II of [2], and ISO 14971 [3]. They all require that EMI be dealt with, but complying with emissions and immunity EMC test standards, even using … [Read more...]

Practical EMC Filter Design and Optimization

 

NOTE: This article has been translated from German into English. It can be found in its original language in the 2014 EMC Europe Guide. Tobias Hofer EMC Consultant HSI Elektonik AG Switching power supplies can be found in nearly all electronic devices. The efficiency should be as high as possible. The no load condition should be in the milliwatt range. In contrast to that, … [Read more...]

E3 Risk Gap Analysis or Once More into the Breech!

 

Assessing the EMC-related risk of using commercial items (CI or COTS, as they are known) has long been a pet project of mine. So, I received a question lately that went something like this (paraphrasing the main points):I am aware the risk analysis or gap analysis is part of the process for analyzing the risk severity depending on test methods, level, frequency coverage … [Read more...]

2013 EMC Salary Survey

 

By Vinti Singh As the electronics industry continues to expand, employment opportunities for EMC engineers continue to grow as well. Products are becoming increasingly complex, and compatibility issues are arising ever more frequently. With each new advancement, EMC engineering jobs around the nation become more important, and more secure. Experienced EMC engineers, especially … [Read more...]

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