Re: [PSES] ESD network schematic

: (256) 650-5261 From: "doug emcesd.com" Reply-To: "doug emcesd.com" Date: Mon, 18 Feb 2019 06:17:26 + To: Conversation: [PSES] ESD network schematic Subject: Re: [PSES] ESD network schematic It is obviously jistvair discharge only. I

[PSES] shielded magnetic loops don't work anything like what people think

Hi All, A few years ago, I started to generate some data for a tutorial on shielded magnetic field loops for new engineers. As happens most of the time with my research on most topics, I found out most of what I and everyone thought about shielded magnetic field loops was wrong. The electric

Re: [PSES] ESD network schematic

It is obviously jistvair discharge only. I suspect this is from the 70s, maybe earlier. The output rise time will be slow further indicating a very early design when they thought ESD had a ten ns risetime. Doug Sent from my iPhone IPhone: 408-858-4528 Office: 702-570-6108 Email: d...@dsmith.org

[PSES] New Technical; Tidbit published

Hi Everyone, I am starting to add new Technical Tidbit articles to my website again. The last one was 2016, but just posted another one with lots to come in the coming months. An upcoming way will cover the best way to measure signal corruption in the face of external interference. If you are

Re: [PSES] ESD network schematic

know the date of original release, and whether that includes ESD. Ken Javor Phone: (256) 650-5261 From: "doug emcesd.com" Date: Mon, 18 Feb 2019 18:23:18 + To: Ken Javor , "emc-pstc@listserv.ieee.org" Conversation: [PSES] ESD network s

[PSES] Accumulating damage causing field failures

Hi Everyone, Last January I delivered a paper at DesignCon on small impulse events causing accumulating damage eventually resulting in system failure. For instance, every time a person touches a conductive object there is a small ESD event. In my paper I described a case where an ESD event of

Re: [PSES] Product Compliance Virtual chapter - June Presentation– Product Safety and the new IoT by Bob Griffin

I think he was kidding as engineers at the time derided Gore’s statement. Probably AT Bell Labs and the military are most responsible for developing the Internet, having watched the process myself at Bell Labs. In the 70s, we were using things like email and I was using networks that became the

Re: [PSES] Question re: Measuring a signal in a noisy environment

Hi Ed and the group, Accredited and not, most test labs I have dealt with have made significant errors in testing. When I see these and and say “You are not performing the test correctly.” There is always pushback and I have never lost the argument. I have also picked up a few clients that

Re: [PSES] Question re: Measuring a signal in a noisy environment

Schaefer From: doug emcesd.com [mailto:d...@emcesd.com] Sent: Sunday, April 21, 2019 8:47 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Question re: Measuring a signal in a noisy environment Hi Ed and the group, Accredited and not, most test labs I have dealt with have made significant errors

[PSES] secure links to my articles

Hi Everyone, I recently added a secure feature to my articles. You can take any link you have for my site's articles and just replace http with https and you will get a secure version of the article. For instance here are three articles that show magnetic loops are not nearly as good for

[PSES] Some more stuff on my website, this time my DesignCon paper

Hi All, Not sure if I posted these links to this forum yet, but in case not, here they are: I keep adding more to my website as time goes on. There are about 300 papers and articles I have written that are posted there at this point along with a lot of other information. The site is at:

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

Hi Monrad and the group, First, Monrad please unblock my email at you company. Tried to send this but bounced. Barth Electronics and I took tons of data this week on many ESD simulators and more are coming. Barth's measurement setup is likely the best one on the planet. Jon Barth understands

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

was involved with TC77B for years. Doug Sent from my iPhone IPhone: 408-858-4528 Office: 702-570-6108 Email: d...@dsmith.org Website: http://dsmith.org From: John Woodgate Sent: Friday, November 8, 2019 3:56:15 PM To: doug emcesd.com ; EMC-PSTC@LISTSERV.IEEE.ORG

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

, 2019, 03:42:00 PM EDT, doug emcesd.com mailto:d...@emcesd.com>> wrote: Hi Montara, There are more stories than I can type here. The standard as written is not very good. We addressed this in the early to mid-1990s and determined what was necessary. We also did a lot of round robin t

Re: [PSES] FCC regulatory statements

Yes!!! Doug Sent from my iPhone IPhone: 408-858-4528 Office: 702-570-6108 Email: d...@dsmith.org Website: http://dsmith.org From: IBM Ken Sent: Thursday, October 31, 2019 4:56:32 PM To: doug emcesd.com Cc: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] FCC

Re: [PSES] FCC regulatory statements

Hi John, The radio listening law was around many decades ago. Usually we just had a #47 pilot lamp on a radio instead of the speaker to know when the station went off the air. At that point, one was to listen on 640 or 1240 kHz. Only required of ham radio operators. That went away decades ago.

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk<http://www.woodjohn.uk> Rayleigh, Essex UK On 2019-10-15 20:06, doug emcesd.com wrote: Well said, Derek! I am always amazed that EMC people worry about the measurement uncertainty of the coax cable that connects

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

IPhone: 408-858-4528 Office: 702-570-6108 Email: d...@dsmith.org Website: http://dsmith.org From: DEREK WALTON Sent: Tuesday, October 15, 2019 11:51:15 AM To: doug emcesd.com Cc: EMC-PSTC Subject: Re: [PSES] Any Different Results in ESD Testing when Changing

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

IPhone: 408-858-4528 Office: 702-570-6108 Email: d...@dsmith.org Website: http://dsmith.org From: John Woodgate Sent: Tuesday, October 15, 2019 1:28:51 PM To: doug emcesd.com ; EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Any Different Results in ESD Testing when

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

. Cheers, Jeff From: doug emcesd.com [mailto:d...@emcesd.com] Sent: Monday, October 14, 2019 10:39 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2) This was pretty much done in the 90s with many round

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

It is not difficult to make a good ESD simulator. The old KeyTek mini-zap would meet the proposed di/dt spec. Doug Sent from my iPhone IPhone: 408-858-4528 Office: 702-570-6108 Email: d...@dsmith.org Website: http://dsmith.org From: John Merrill Sent: Tuesday,

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

: John Woodgate Sent: Tuesday, October 15, 2019 9:27:08 AM To: doug emcesd.com ; EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2) I take your point, but I wasn't proposing a full replication of the earlier

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

: John Woodgate Sent: Tuesday, October 15, 2019 00:52 To: doug emcesd.com; EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2) No doubt it was very good work, but its OLD. One or two new papers would be a good

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

I don’t think the price of an ESD would double, and even it it did, that is better than wasting tens of millions of dollars every year borne by all the manufacturers in unnecessary redesign and delay to market. There is no excuse for poor test equipment design. It would not be hard for me,

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

: Tuesday, October 15, 2019 2:50:46 PM To: doug emcesd.com ; EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2) The discussion is becoming more general, but perhaps it needs to be. The way IEC works

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

. In order to assess that, you would round-robin using the same model of gun. Perhaps that is one of the many things to which Doug referred. Ken Javor Phone: (256) 650-5261 From: "doug emcesd.com" Reply-To: "doug emcesd.com" Date: Mon, 14 Oct

Re: [PSES] Any Different Results in ESD Testing when Changing Brands of ESD Simulator (IEC 61000-4-2)

Hi Montara, There are more stories than I can type here. The standard as written is not very good. We addressed this in the early to mid-1990s and determined what was necessary. We also did a lot of round robin testing. Probably most of what you want has been published in the 1990s. Look at

[PSES] My latest video,, another scope hack

Hi All, Here is my latest video, a scope hack for high voltage measurements when you don't have an HV probe. https://youtu.be/i87k7Qvakbc Doug [cid:image001.jpg@01D6757F.E9159350] - This message is from the IEEE Product Safety

[PSES] LInk to my latest technical videos

Hi All, I have been creating a lot of videos lately with more coming. Here is the link to them: https://www.youtube.com/user/dougcsmith Some of them involve high power, up to a megawatt peak power utilizing a capacitor I can barely lift, to test extreme failure modes (and to have some fun).

[PSES] My latest video - a scope hack

HI All, I have just uploaded my latest video describing a scope hack (or feature, if you would). This is very handy for looking at some fast signals. https://youtu.be/f_p9Q684a64 Doug [cid:image001.jpg@01D66B43.752F8E00] - This

[PSES] New YouTube video on current probe terminations

Hi All, I just uploaded a new video on placement of 50 Ohm feed-thru terminations used to alter current probe response. You may also want to look at some of the other videos on my channel. Here is the link: https://youtu.be/bWitxU_4SrE Doug [cid:image001.jpg@01D656D7.18F253A0] -

[PSES] New video on static charges causing EMI and SI problems.

Hi All, Here is my latest video (created on a ChromeBook!) covering a way static charges can generate EMI and SI issues. Hope you enjoy it. https://youtu.be/4Ay9zM34vKg Doug

[PSES] My latest technical video

Hi All, I just posted my latest video. This one is a time domain treatment of multi-turn ferrite cores that might be used in circuit design, EMC, or ESD. Most analyses of these structures are in the frequency domain but time domain analysis can help better understand how these cores affect

[PSES] Website walkthrough and new info

Hi All, If you search YouTube for "dougcsmith" you will find my page there. I am adding videos at about 3 per week these days including one just now. Lots of good tech videos and a few that are health related. Doug [cid:image001.jpg@01D65DE8.5AA02990] -

[PSES] High pulsed power video

Hi All, Here is my latest video where I apply high power pulses to various resistors (~1 Megawatt) to investigate resistor robustness. This leads to a discussion of the safety implications of anytime a 1 W or higher resistor is used on a PCB. https://youtu.be/IYqCiKJBRiU Doug

[PSES] Latest engineering video

Hi Everyone, I just uploaded my latest engineering video on altering a current probe's frequency to suit you from the outside. You may not think current probes are useful in SI, but they can be. I have a method, for instance, using a current probe, to measure the peak noise VOLTAGE riding on

[PSES] new videos

Hi All, I have been adding a lot of technical (and a few health related) videos to my YouTube channel. I plan to do a few more this coming week. Here is the link: https://www.youtube.com/user/dougcsmith/videos Doug [cid:image001.jpg@01D673E1.756EF490] -

[PSES] My latest Technical Tidbit video on system problems

Hi All, I just uploaded my latest video on how a circuit problem in one part of a system can appear to be coming from a far away part of the system. In this case, the example is of a noise issue on one PCB that appears to come from a remote PCB meters away in a large system. Here is the link

[PSES] new video posted on design rules of thumb

Hi All, A few weeks ago I presented a live web session on design rules of thumb. I made a video of it! The video and the pdf graphics from the video (they are not self-explanatory without seeing the video) are posted as the latest Technical Tidbit on my website. Feel free to download the

[PSES] engineering rules of thumb

Hi All, I am going to do a 30 minute informal "Rules of Thumb in Electrical Engineering" presentation on Thursday at 11 am PDT (US West coast time). All are welcome and there is no cost. There will not be a set of slides to distribute but you are encouraged to take screenshots of anything that

Re: [PSES] engineering rules of thumb

iginal Appointment- From: Stultz, Mark <0f79f2e10e47-dmarc-requ...@listserv.ieee.org> On Behalf Of Stultz, Mark Sent: Tuesday, March 16, 2021 9:19 AM To: doug emcesd.com; EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Canceled: engineering rules of thumb When: Thursday, March 18, 2021 11:00

Re: [PSES] engineering rules of thumb

From: Stultz, Mark <0f79f2e10e47-dmarc-requ...@listserv.ieee.org<mailto:0f79f2e10e47-dmarc-requ...@listserv.ieee.org>> On Behalf Of Stultz, Mark Sent: Tuesday, March 16, 2021 9:19 AM To: doug emcesd.com; EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> S

Re: [PSES] engineering rules of thumb

/cYdIik4z-h0 Doug Smith Sent from my iPhone IPhone: 408-858-4528 Office: 702-570-6108 Email: d...@dsmith.org Website: http://dsmith.org From: doug emcesd.com Sent: Wednesday, March 17, 2021 09:56 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: *** [PSES] engineering rules

Re: [PSES] engineering rules of thumb

equ...@listserv.ieee.org>> On Behalf Of Stultz, Mark Sent: Tuesday, March 16, 2021 9:19 AM To: doug emcesd.com; EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: [PSES] Canceled: engineering rules of thumb When: Thursday, March 18, 2021 11:00 AM-12:00 PM (UTC-08:00) Pacific T

Re: [PSES] [SI-LIST] Re: [PSES] engineering rules of thumb

Smith Sent from my iPhone IPhone: 408-858-4528 Office: 702-570-6108 Email: d...@dsmith.org Website: http://dsmith.org From: richard schumacher Sent: Friday, March 19, 2021 7:55:06 PM To: doug emcesd.com Subject: Re: [SI-LIST] Re: [PSES] engineering rules of thumb

[PSES] My new Odysee technical channel

Hi All, I have created two new video channels over on Odysee. On https://Odysee.com/@Dougsengineering I will be posting technical videos as well as copying over my YouTube technical videos there. New content will only be posted to Odysee though. I am currently working on a new video using my

Re: [PSES] My new Odysee technical channel

, August 19, 2021 5:05:50 PM To: doug emcesd.com ; EMC-PSTC@listserv.ieee.org Subject: Re: [PSES] My new Odysee technical channel Hi Doug, Uh, let's see ... 1,000 A x 15,000 V = 15,000,000 W. Not sure about the gain or directivity but that's alot of power! Hopefully it's just a pulse or two

Re: [PSES] My new Odysee technical channel

, 2021 5:05:50 PM To: doug emcesd.com ; EMC-PSTC@listserv.ieee.org Subject: Re: [PSES] My new Odysee technical channel Hi Doug, Uh, let's see ... 1,000 A x 15,000 V = 15,000,000 W. Not sure about the gain or directivity but that's alot of power! Hopefully it's just a pulse or two

Re: [PSES] My new Odysee technical channel

thousands of miles per year. Even at 110+ degrees in the summer! Doug [cid:image001.jpg@01D79B46.C7707150] From: Bill Owsley Sent: Friday, August 27, 2021 12:13 To: doug emcesd.com ; EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] My new Odysee technical channel Typical lightning is about 300

Re: [PSES] My new Odysee technical channel

] From: Manny Barron Sent: Friday, August 27, 2021 2:20 PM To: doug emcesd.com ; EMC-PSTC@listserv.ieee.org Subject: Re: [PSES] My new Odysee technical channel Wow Doug, Very interesting science project. I'm curious, why are you doing this? Just because . . . or is there a specific

[PSES] my latest video

Hi All, I have two Odysee channels, @Dougsenginnering and @Dougshealthandrunning I have just posted a video to @Dougsengineering working on developing my V1.0 EMP generator. Work like this often ends up generating content for my classes. Here is the link:

Re: [PSES] My new Odysee technical channel

Email: d...@dsmith.org Website: http://dsmith.org From: Manny Barron Sent: Friday, August 27, 2021 8:39:40 PM To: doug emcesd.com ; EMC-PSTC@listserv.ieee.org Subject: Re: [PSES] My new Odysee technical channel That's the best reason! Although you may not be looking

[PSES] new videos and my Odysee channel for them

Hi All, Here is the link to my latest newsletter which has links to several videos on my new Odysee channel. I plan to copy over all my YouTube videos plus add more content. I will not be adding any more to my YouTube channel. Newsletter: https://conta.cc/3DET0Re Odysee channel:

[PSES] unusual conducted emissions question

Hi All, I have come across an unusual conducted emissions issue with a device where the impedance stabilization network for automotive testing itself causes a problem that will not let a class of equipment ever pass because of the network not the equipment itself. In this case, the power is

Re: [PSES] unusual conducted emissions question

Not a car. The power to our EUT is cycled by a a device. To put it on the other side of the LISN would not mean much as we have no control of that device. And even if we did that, the continuous interruption of the DC current would still send the LISN into oscillation at each current edge.

Re: [PSES] unusual conducted emissions question

There is a device between us and the electrical system that does the power cycling. We have no control over that device, part of the vehicle. Doug Smith Sent from my iPhone IPhone: 408-858-4528 Office: 702-570-6108 Email: d...@dsmith.org Website: http://dsmith.org

Re: [PSES] Minimizing EM radiation from a 5G multi device test lab

Hi Chas and the group, Why not just turn down the RF power on your router a bit? Doing this also improves security. You can also change channel assignments as well but that may require coordination with the others in the building. But lowering the power level does not. Just set it to be

[PSES] EMC/SIPI symposium question

Hi Everyone, I just saw an announcement from the Symposium in August in Spokane, WI and had a question. What is the current Covid climate like there from the point of review of restrictions and as a local, do you think it will change by the end of summer? The kind of typical restrictions I

Re: [PSES] EMC/SIPI symposium question

...@dsmith.org Website: http://dsmith.org From: Dan Roman Sent: Friday, January 28, 2022 5:41:26 AM To: doug emcesd.com ; EMC-PSTC@LISTSERV.IEEE.ORG Subject: RE: [PSES] EMC/SIPI symposium question Hi Doug, Based on the events of the past two years I think the only thing

Re: [PSES] EMC/SIPI symposium question

, January 28, 2022 9:35 To: EMC-PSTC@listserv.ieee.org Cc: doug emcesd.com ; doug...@gmail.com Subject: Re: [PSES] EMC/SIPI symposium question I see chatter about Covid on the list, and this article has a lot of good info: "By the end of February, 36%-46% of the US population will have been inf

Re: [PSES] EMC regs in by US state!

Sent from my iPhone IPhone: 408-858-4528 Office: 702-570-6108 Email: d...@dsmith.org Website: http://dsmith.org From: Manny Barron Sent: Tuesday, May 10, 2022 17:52 To: doug emcesd.com ; EMC-PSTC@listserv.ieee.org Subject: Re: [PSES] EMC regs in by US state! Doug

[PSES] EMC regs in by US state!

Hi All, Did you know there is one US state that has immunity regulations applicable to ESD (it is not an ESD test itself)? It is a state very concerned with extreme equipment reliability and your equipment has to pass this test if you want to sell to customers in a specific industry in that

[PSES] EMP on the cheap

Hi Everyone, Lately I have been working on a desktop "EMP" generator on the cheap for testing circuits and equipment without spending a lot of money. One of the challenges is characterizing and calibrating it without having a suitable current probe. I designed a simple, self calibrating

[PSES] Surprising data on most commercial ESD smulators

Hi All, I have measured data on most ESD simulators on the market, characterized for waveform purity and E-field emissions at a considerable investment in personal time and resources. The data is quite surprising and is similar to, but with more data than the work I did in the 1990s with

[PSES] static fields

Hi All, Did you know that just a static E-field can cause improper operation of some equipment like smoke detectors? No discharge necessary. Just "ES" without "D"! One of my E-field experiments set off a smoke detector in the next room, reliably, from 15+ feet away! You don't want to be near

[PSES] data presentation on ESD simulators

Hi All, I have been hinting at my efforts to characterize ESD simulators and have generated a treasure trove of data on most modern ESD simulators for waveform and E-field emissions to 5 GHz. This data can save an engineer, company, or test lab a lot of effort during ESD testing. The data

[PSES] New Technical Tidbit article

Hi All, I have started adding Technical Tidbit articles on my website again. This one is on the significantly different testing outcomes that result from the undocumented (not described in IEC 61000-4-2) differences in ESD simulators because of noise on the current waveforms and E-field

[PSES] Latest Technical Tidbit

Hi All, I believe I sent this link at the beginning of the long holiday weekend here in the US. If you are like me, by Monday morning, the email was a few hundred emails down in the list and many missed it. The article talks about the poor repeatability of ESD testing results for IEC

[PSES] incorrect test failures

Hi All, Test failures (performance, compliance, or any other) just before product introduction are very expensive. It is not unusual to cost a company US$100,000 or more revenue per day of product delay. Given that... There is an issue with IEC61000-4-2 based ESD testing, and it is

[PSES] LED RF immunity

Hi All, I recently worked on a case where a conducted immunity RF test caused an unpowered circuit's LEDs to light up causing a failure. It turns out that LEDs can work well enough at much higher frequencies than one would expect. In addition to that, in the process of lighting up, a lot of

[PSES] LED RF sensitivity test

Hi All, I recently had looked at a case where a piece of equipment being tested for conducted RF immunity has some of its LEDs lit by the RF when the equipment was unpowered, which caused a test failure as the LEDs indicated a safety condition. The equipment had no power switch, when its

Re: [PSES] Resend of complete message on ESD thoughts

-4528 Office: 702-570-6108 Email: d...@dsmith.org Website: http://dsmith.org From: Brent DeWitt Sent: Monday, March 6, 2023 3:54:22 PM To: doug emcesd.com ; EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Resend of complete message on ESD thoughts I'll jump

[PSES] A morning of experiments

Hi All, I was thinking of presenting a morning of experiments demonstrating troubleshooting techniques I have developed over time via web meeting. The presentation would not have any slides but be all demonstrations of techniques. Most of the techniques are not well known in the engineering

[PSES] filtering contact discharges to get a more realistic discharge at high voltages

Hi All, We were recently discussing contact discharges at high voltages, like 20 kV, being very far from reality. There is a way to make a nice repeatable contact discharge corresponding to high voltages by filtering the output of the ESD simulator. Here is one example intended for another

[PSES] Op amp circuit design to avoid noise issues

Hi All, Op amps can be sensitive to digital noise on the same or adjacent PCBs in a system as well as to emissions from RF sources like cell phones. Here is an article on a technique that has been 100% effective since I discovered it over 40 years ago. I still use it on modern circuits and it

Re: [PSES] [SI-LIST] Re: Interesting material

://dsmith.org From: Lyndell Lee Asbenson Sent: Saturday, February 18, 2023 8:24:54 PM To: doug emcesd.com ; Morales, Aldo W ; EMC-PSTC@LISTSERV.IEEE.ORG ; si-l...@freelists.org Subject: Re: [SI-LIST] Re: Interesting material Thanks Doug, the stories I have of ESD

[PSES] Resend of complete message on ESD thoughts

Hi All, I have a few thoughts I would like to share with you on ESD that have comes out of my private research into the field in recent years. 1. A 2kV air discharge can be much more likely to cause equipment malfunction than any other discharge of any voltage. 2. There is no natural ESD

[PSES] Interesting thoughts on ESD and systems

Hi All, I have a few thoughts I would like to share with you on ESD that have cons outbid my research into the field in recent years. 1. A 2kV air discharge can be much more likely to cause equipment malfunction than any other discharge of any voltage. Doug Smith Sent from my iPhone

[PSES] Breakdown of barriers in power supplies

Back in 2015, in my paper at the Institute of Physics in Southampton, England, I showed how 800 Volt ESD or EFT events can break over a 1500 VRMS (~2100 V peak) barrier in a power supply involving ringing in the EMC power line filter. This would be a low energy discharge, however it may degrade

Re: [PSES] Interesting material

Website: http://dsmith.org From: doug emcesd.com Sent: Friday, February 17, 2023 10:54:10 PM To: EMC-PSTC@LISTSERV.IEEE.ORG ; si-l...@freelists.org Subject: Interesting material Hi All, I was testing a new material for a different purpose and accidentally found

[PSES] Interesting material

Hi All, I was testing a new material for a different purpose and accidentally found that it was very sensitive to humidity/moisture. Might make a good humidity alarm for an industrial process or other application. What do you think? Here is a short video:

Re: [PSES] Interesting material

: EMC-PSTC@LISTSERV.IEEE.ORG ; si-l...@freelists.org ; doug emcesd.com Subject: Re: Interesting material Hello Colleagues: Please check this paper on humidity and temperature that we published long time ago Modeling Relative Humidity and Temperature Effects on Scattering Parameters in Transmission Line

[PSES] “Morning with Doug” virtual experiment session

Hi All, I am going to hold virtual experiment sessions next Tuesday the 18th. There will be two sessions, one at 9 am PDT (US West Coast) and 1 pm PDT. I will perform multiple live experiments on operating circuits that I have developed from my research. Some of them have the opposite result

[PSES] Consultant story

"A giant ship's engine broke down and no one could repair it, so they hired a Mechanical Engineer with over 30 years of experience. He inspected the engine very carefully, from top to bottom. After seeing everything, the engineer unloaded his bag and pulled out a small hammer. He knocked

[PSES] IC package parasitics

Hi All, Here is a paper I wrote some time ago covering a few techniques I use to see the effect of package parasitics on the operation on an IC in real-time. I have solved problems this way that clients struggled with for months and it took me only minutes to understand what was happening and

[PSES] Noise troubleshooting technique

Occasionally when troubleshooting a board, I suspect there is an issue with ground potentials between an ICs pins causing either signal corruption or even latch up of the device. For simpler boards where this is possible, here is a link, below, to one technique that I use. Before a layout can

Re: [PSES] Current Probe for Surge Immunity Calibration Validation

I have found Fischer Custom Communication probes to be of the highest quality. I have found that with some other probes, significant E-field response is a problem, and you need to measure E-field response yourself. I have seen current probes with an E-field response as much as the intended

[PSES] "Morning with Doug" experiment session

Hi All, I was thinking of doing a morning's presentation of just live experiments, no slides, just a series of live experiments that most engineers will find interesting, and may demonstrate that circuits and measurements do not always act like we think they do. Here is a proposed list:

Re: [PSES] Woodgate's reply on residential Immunity field strength

Hi All, My observation is that a cell phone at max power, close to the product, generates voltages and currents in the product that are on the order of what a 100 V/m far field would induce! I have seen many manifestations of this including making a product permanently non-functional.

[PSES] Order of attenuators

Hi All, Here is a puzzle. I have a signal source of average power less than 10 mW and I want to put three attenuators on the output, 20 dB, 6 dB and 3 dB. All are two Watt attenuators. What order should I put them on to minimize the chance of burning some of them out? This is a situation I

Re: [PSES] Order of attenuators

.googleusercontent.com/_HuR3Ky2TF_XhFHyxnYRmiq7nHQldnMsPNYFaLG6kb5T4y8MeCe-BDC_BscJtSFgszSSjssihHS-pjM3-jwNP8S0CwE-gN8fsRsPkojiAlmpBwb20vIVizS-siCUywW_jqrefbVr] From: Richard Nute Sent: Monday, July 24, 2023 13:51 To: doug emcesd.com Subject: RE: [PSES] Order of attenuators Hi Doug: Since the source

[PSES] thoughts on ESD test lab problems

Hi All, Just a couple of thoughts on what a good lab should do for ESD testing and how to protect yourself as a client from test problems. 1. Bring an Ohmmeter with you to the lab and measure the resistance from the Horizontal Coupling Plane to the Ground Reference Plane. It should be

Re: [PSES] thoughts on ESD test lab problems

I didn’t say most labs are bad. Errors do happen and for me almost every lab I have used has made a mistake. These errors are rare but do happen and the effect of a single error can be very costly. One lab made an especially bad mistake for a small company that engaged me that cost the company

[PSES] Unknown SI and EMC approaches

Hi All, First a few questions: 1. Do you know what US State has an EMC requirement that a company must meet to sell certain types of products there? And, why you might want to do this test on your equipment to avoid field issues that can be costly. 2. ESD testing completely misses a lot

Re: [PSES] thoughts on ESD test lab problems

ight, then the standard is a failure. -- Ken Javor (256) 650-5261 From: "doug emcesd.com<https://urldefense.proofpoint.com/v2/url?u=http-3A__emcesd.com=DwMDaQ=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM=c9NR2mGfldry-2pM9Bbuww=2PwUVOf-nkk5PGnCGiZ_awAOCLYGgF6VrmmUR0MyZYVG8A4TDFmh_VavNrLO9d-D

[PSES] shielded probes do not work in the near field

Hi All, The following three articles and the referenced paper from my website show that, contrary to popular belief, shielded magnetic field probes do not work in the near field. The E-field shielding in magnetic field probes only work in the far field or for fields that are symmetrical about

[PSES] ESD Simulators cause irreproducible results!

Hi All, If you ever had issues with differing ESD test results between labs, you need to see my Technical Tidbit of November 2022, https://emcesd.com/tt2022/tt111822.htm Show that article to your test lab! The data in the article represents about ½% of the total data I have with simulator

[PSES] design rules of thumb

Hi All, Some time ago I published a set of informal design rules of thumb from many industries that also apply to electrical engineering. Since it was a while ago and many likely missed it, I put the link below. This is an example of some of the unusual sources of information that are often

Re: [PSES] RFID testing per AIM 7351731

Try NTS Fremont or Intertek. Doug Smith Sent from my iPhone IPhone: 408-858-4528 Office: 702-570-6108 Email: d...@dsmith.org Website: http://dsmith.org From: AOL MAIL Sent: Wednesday, April 10, 2024 7:57:03 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] RFID