Read Part II here.I just finished rearranging my office. It all started with buying a new MS Windows 8 computer (that’s a story all on its own) followed closely by the failure of my printer to feed paper. So I bought a new printer, which is about two times bigger than my old one, and it wouldn’t fit in the previous location. So I moved my little flat screen TV into the old … [Read more...]
Elephant in the Test Room #1 Continued – The Final Piece in the Conventional Approach
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...]
Well THAT Didn’t Take Long …
At long last, the US Department of Defense Chief Information Officer has released the updated version of DoD Instruction 3222.01, the DoD Electromagnetic Environmental Effects (E3) Program, into the DoD Portal for formal stage 3 coordination, or in English, for official review and comment by interested DoD organizations. It’s actually been several years on the making, … [Read more...]
Elephant in the Test Room #1 Continued – The Solid-State Approach
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...]
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...]
Wi-Fi Anyone?
So I found another item of EMI interest to whine - I mean write - about: EMI in legacy equipment. You can find the article in question here.In a nutshell, the FAA wants certain older cockpit displays (made by Honeywell) replaced because they believe them to be susceptible to interference from Wi-Fi systems that are going on board many aircraft today. It’s an interesting … [Read more...]
Zap – You’re Gone! A Few Truths About Lightning Safety
The last several posts have been about EM radiation hazards (RADHAZ), but there are other electromagnetic hazards. If you’ve ever been shocked by an ESD jumping from your finger to a doorknob after walking across the carpet on a cold dry winters day just imagine that incident being magnified by multiple orders of magnitude. I live in Florida and we are now winding … [Read more...]
Elephant in the Test Room #1 Continued – The ’Get Around’ Explained
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...]
Which Came First? The Chicken or the Egg?
I came across an interesting article in ITEM this past week about a Canadian helicopter that apparently has EMI problems. Like most such articles that I come across, I dutifully posted it in a variety of EMC related groups on LinkedIn. I do that for a couple of reasons. First, I believe its always a good idea to circulate relevant information to the EMC community. How can we … [Read more...]
Elephant in the Test Room #1 Continued – The List of Practical Solutions
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 … [Read more...]
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