Re: [PSES] MIL-HDBK-237B drastic changes

[Michael Viau]

I think we share sentiments here for the most part Mr. Javor.  I barely know any E3 engineers or Spectrum Managers who have even opened MIL-HDBK-237D, so there is no chance a PM is going to have read it.  What surprised me is that it almost seemed like during the B to C transition the E3 part was totally dropped and the Spectrum part took over.  And it seems like we really haven’t had much guidance on how to establish an E3 program since 237B.  Handbooks actually seem like the appropriate place to walk people through a process in great detail. But… the process in question is program management and it seems like the more precise and detailed the guidance gets, the less accurate it is.  For example, the Defense Acquisition Guidebook (DAG) is a beautiful 1,250 page masterpiece that is absolutely useless in practice because no one program seems to follow it.  So in many ways I agree with you, but I think having, and updating, that guidance is still useful to early career engineers and anyone looking for a baseline interpretation on these deliverables.  Even if no one followed it, I think it would be nice to have a better breakdown of these DIDs for teaching purposes, if nothing else.  Thanks for your thoughts Ken!  Always appreciated! Michael Viau On Jun 22, 2024, at 1:39 PM, Ken Javor <ken.ja...@emccompliance.com> wrote:  I saw Mr. Viau’s post and purposely didn’t answer it for two reasons.   First and foremost, I don’t have a definitive answer to his question.   But second, my reaction to all these revisions was somewhat opposite of his. That is, I recall the original 1973 release, which was current when I got started, and (if memory serves – unfortunately I don’t have a copy) it was 37 pages long.  That may be in error, but what is absolutely true is that the original was much shorter than any of the revisions. My assessment of the original was that it was perfect for some new program manager who may have previously been peripherally aware of the concept of EMC, but now needed a little more in-depth understanding of the EMC aspects of the product acquisition process.  When revision A came out, I was quite disappointed, because it had suffered “mission creep” and was never, ever, not ever, going to be read by anyone in a managerial position. It may well have been useful for someone who needed to learn the Navy EMC process in detail, but the “customer” for that handbook had completely changed.   A guess as to the changes between the follow-on revisions, based purely on analogous experience, is that when personnel change, viewpoints change and even though the underlying technical or managerial issues have not changed, each contributor wants to put his stamp on things, so that handbook changes often arise from varying personalities, as opposed to purely factual matters.   Sorry, that’s all I’ve got, which is why I didn’t originally respond.  Long shot, if anyone has a copy of the original 1973 release of MIL-HDBK-237, I would appreciate a copy, to complete my collection.   Thank you,   --    Ken Javor Ph: (256) 650-5261     From: Ken Wyatt <k...@emc-seminars.com> Reply-To: Ken Wyatt <k...@emc-seminars.com> Date: Saturday, June 22, 2024 at 11:19 AM To: <EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] MIL-HDBK-237B drastic changes   You might check with Ken Javor (ken.ja...@emccompliance.com). He’s pretty savvy on MIL-STDs. _______________________ I'm here to help you succeed! Feel free to call or email with any questions related to EMC or EMI troubleshooting - at no obligation. I'm always happy to help! Kenneth Wyatt Wyatt Technical Services LLC 8201 Lighthouse Lane Ct Windsor, CO 80528 Contact Me!    New Books! <image001.jpg>     <image002.jpg>     <image003.jpg> Web Site | Blog The EMC Blog (EDN) Subscribe to Newsletter Connect with me on LinkedIn  On Jun 19, 2024, at 5:55 PM, Michael Viau <michael.t.v...@gmail.com> wrote:   Does anyone have any documentation (or even a story) on why the changes between MIL-HDBK-237B (1997) and 237C (2001) were so drastic? 237B filled a sorely missed gap in terms of how the DIDs were explained and described. It seems to be the most recent document to actually talk through the expectations for an E3IAR. And the last one to talk about EMC Control Plans in any detail. ADS-37A-PRF has a full appendix describing an E3IAR, but it was a year before 237B was released. Why did C drop all of this helpful context? 237C genuinely seems like it could be an entirely separate document, and it seems odd that they went through the effort of deleting so much of rev B. Any suggestions for clues I could follow to paint the picture? Thanks everyone! Michael Viau - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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