Re: [PSES] dielectric strength question

ting updates please send us an email on > he...@unit3compliance.co.uk or call 01274 > 911747. Our lead times for testing and consultancy are typically 4-5 weeks.* > > > > > > > > > > *From:* Adam Dixon > *Sent:* Tuesday, June 25, 2024 1:24 PM > *To:* EMC-PST

Re: [PSES] dielectric strength question

SWAG #2: non-uniformities in materials + multiple breakdown mechanisms make it difficult to model. Mica shows up in 1940's vintage literature. Here are some interesting papers that I perused after Rich posed the question: https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=9079498 Space change

Re: [PSES] NRTL label correction process?

with the NRTL to see what they are comfortable with. > > -Ken A > > On Wed, Oct 25, 2023 at 10:05 PM Adam Dixon > wrote: > >> I'd appreciate feedback about steps to take if a small batch of labels >> were printed/applied/shipped with an erroneous format. A friend wi

[PSES] NRTL label correction process?

I'd appreciate feedback about steps to take if a small batch of labels were printed/applied/shipped with an erroneous format. A friend with whom I worked years ago posed the question during a long overdue lunch. I tried searching a few NRTL sites and PSTC archives but didn't find a link or docume

Re: [PSES] UL 510 Flame retardant tape

Charlie, As the risk assessment and testing ensues, here are a few resources which may have a bit of useful information: https://www.nfpa.org/-/media/Files/News-and-Research/Fire-statistics-and-reports/Hazardous-materials/rflithiumionbatterieshazard.ashx -- good reference, though section on Batte

Re: [PSES] EMC/EMI Cables

I haven’t dissected an HDMI cable in a couple of years, but the HDMI Adopters consortium calls out lower EMI for 2.1-compliant cables: https://www.hdmi.org/spec21sub/ultrahighspeedcable Any cable labeled as 2.1-compliant should still be dissected. Cheers, Adam in Atlanta adam.di...@ieee.org On

Re: [PSES] HDMI distribution amplifier (1:4) and HDMI cable recommendations?

st peoples budget. Mid price home AV equipment > might be a good place to start as this will have to meet Class B emissions. > > > > HTH > > James > > > > > > > > James Pawson > > EMC Problem Solver > > > > *Unit 3 Compliance* > > EMC Te

[PSES] HDMI distribution amplifier (1:4) and HDMI cable recommendations?

I would appreciate HDMI DA/splitter and cable recommendations for a test lab requiring a minimum of 4 HDMI displays. There was 2017 discussion about "quiet" TV's and cables. I'm interested in 1:4 distribution amplifiers/splitters, as well as 10' to 25' cables. I expect I'll dissect cables again,

[PSES] label/compliance questions for Android embedded systems

Android-based systems are new territory for me. What are the potential compliance requirements for customizing an Android platform with seemingly good compliance status? 1. Hardware and core OS functions would not change. 2. User interface would be customized and a few end user applications pre

Re: [PSES] human skin resistance

Ah, the other skin effect. ;-) Not exactly what is sought, but maybe there is useful information in the realm of BIA research such as this papers like this (?) (apologies for the long link copied from iPad browsing..): https://watermark.silverchair.com/388s.pdf?token=AQECAHi208BE49Ooan9kkhW_Er

Re: [PSES] Johnson City NY - crazy street lights

These are LED technology from a 2015-2016 vintage conversion. It could be any number of possible causes. Based on the power outage, it could be a low voltage startup behavior of the LED driver. Could also be comms-related as you describe. Would be interesting if anyone has a reference related t

Re: [PSES] Red phosphorus flame retartants

9]* > > indicates that it is not exactly up-to-date. > > Best wishes > John Woodgate OOO-Own Opinions Only > J M Woodgate and Associates www.woodjohn.uk > Rayleigh, Essex UK > > On 2019-01-02 00:16, Adam Dixon wrote: > > Here's a good article focused on componen

Re: [PSES] Red phosphorus flame retartants

Here's a good article focused on component reliability with some discussion of how red phosphorus is produced and comparison to several alternate fire retardant chemistries: https://www.dfrsolutions.com/red-phosphorus-induced-failures-in-encapsulated-circuits Cheers, Adam in Atlanta adam.di...@i

Re: [PSES] Frequency of Occurrence of ESD with respect to Voltage

Hi, Charles, Would you be able to share a bit more context? Are you interested in a basic distribution of discharge event vs. voltage (lots of parameters which affect this)? Catastrophic or latent failures or both? Particular classes of devices/systems/environments? Detectable by a human or do

Re: [PSES] IEC60950-1 Limited Power Source via IC current limiter

This question has been asked on TI's E2E forum for other parts in this family. See the 2nd 60950 report link that Eric posted in this discussion thread: https://e2e.ti.com/support/interface/usb/f/1008/t/563031 It might be worth opening a new thread for this particular part number to see if ther

Re: [PSES] ESD question

Doug, How significant are differences between the telephone/radar operators cases and Ken's experience? Equipment capacitances (higher pF for telephone/radar operators), discharge location and voltage (Ken's in-ear ear buds vs. "on/over ear" for operators), wire lengths and floating vs. earthed c

Re: [PSES] CI Software Flicker/Harmonics

Both VMWare and college CS/engineering intern are good recommendations in my opinion. Here's a MATLAB code sample for the DIY 61000-4-7 route (not checked for correctness, but see the 'Functions' tab): https://www.mathworks.com/matlabcentral/fileexchange/43496-iec-61000-4-7-for-harmonics-calculati

Re: [PSES] SV: [PSES] Li-Fi

I am skeptical about 100's of Mbps+, but is application-dependent and will be well-above that of a Naval signalman's morse code. ;-) I wouldn't want to have many/all the lights in my home on, even if highly dimmed, just so laptop can talk with printer in the next room, let alone if I am in the ba

Re: [PSES] Pilot rating

I only pilot paper airplanes and this isn't my area of expertise, but it looks like this potential requirement originates in NEMA ICS 5 "Industrial Control and Systems: Control Circuit and Pilot Devices" and perhaps also in IEC 62314 (Solid State Relays - as a "control" relay though the word 'pilo

Re: [PSES] power strip details

>From K.98: 3.1.4 multiservice surge protective device (MSPD) [ITU-T K.85]: A surge protective device (SPD) containing both telecommunications and mains protection. It may also include port protection for video or Ethernet Cheers, Adam in Atlanta On Tue, Sep 19, 2017 at 4:16 AM, John Woodgate w

Re: [PSES] Flicker from LED and CFL light bulbs

w what you find. > > > > :>) br, Pete > > > > Peter E Perkins, PE > > Principal Product Safety & Regulatory Affairs Consultant > > PO Box 23427 > > Tigard, ORe 97281-3427 > > > > 503/452-1201 <(503)%20452-1201> > > &g

Re: [PSES] Flicker from LED and CFL light bulbs

For reading somewhat more reliable than the particular UK media cited, try the Wikipedia article for "flicker fusion threshold." ;-) https://en.wikipedia.org/wiki/Flicker_fusion_threshold. Reference 11 is a good relevant refereed journal article. In the LCD panel world, there is a factory adjus

Re: [PSES] IEC 62133 Question

It's not my area of expertise, but here's one application guide that does differentiate between tab attachment methods with regard to potential cell damage recommending welding over soldering: http://data.energizer.com/pdfs/lithiuml91l92_appman.pdf. None of the welding methods articles that I have

Re: [PSES] Metal back of US fridge - Grenfell Tower Fire

> Hi Adam, > > > > The info supplied is interesting! Yes, it aligns with John’s thought. > However, the recalled units are quite different – 5,200 vs 1.2 m. In the > UK, there are a few million recalls of clothes dryers in last few years – > that is quite different from

Re: [PSES] Metal back of US fridge - Grenfell Tower Fire

Here's a slightly dated but popular US magazine article with a table near the end that supports John's closing thought about rarity of fridge fires compared to tumble-dryer fires (1:9 ratio). http://www.consumerreports.org/cro/magazine/2012/03/appliance-fires-is-your-home-safe/index.htm Cheers,

Re: [PSES] AC/DC power conversion and system architecture (in-rush limiting, reliability, cabling)

for a range of system designs/sizes. Thanks again! -Adam On Mon, Mar 20, 2017 at 2:48 PM, Brian O'Connell wrote: > *From:* Adam Dixon [mailto:lanterna.viri...@gmail.com] > *Sent:* Sunday, March 19, 2017 9:59 AM > *To:* EMC-PSTC@LISTSERV.IEEE.ORG > *Subject:* [PSES] AC/DC pow

[PSES] AC/DC power conversion and system architecture (in-rush limiting, reliability, cabling)

Long post from this weekend's studies I have been thinking about power distribution system tradeoffs for large systems where multiple AC/DC power supplies are used. Surveying 5 or 6 suppliers, picking an arbitrary 100W - 200W range for comparison, I see in-rush current specs with a very wide r

Re: [PSES] EMC co-location distance question

It's been awhile, but at the time when wanting to understand modular test requirements, the 2dB asymptote/leveling off was a reference in FCC Part 15 Section 15.31 (a) (3) pointing to ANSI C63.4-2003. Regards, Adam in Atlanta On Thu, Mar 9, 2017 at 1:16 PM, Sundstrom, Mike wrote: > Regan, > >

Re: [PSES] crimp hardware for multiple conductors?

> > > > > On Tue, Feb 21, 2017 at 7:12 AM, John Woodgate > wrote: > > It only helps to show that this is a 'grey area', suggesting that for a > quiet life, do not use more than one wire. > > > > In practice, two solid wires are very troubleso

Re: [PSES] crimp hardware for multiple conductors?

n Opinions Only > > www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England > > > > Sylvae in aeternum manent. > > > > *From:* Adam Dixon [mailto:lanterna.viri...@gmail.com] > *Sent:* Tuesday, February 21, 2017 12:45 PM > *To:* EMC-PSTC@LISTSERV.IEEE.ORG

[PSES] crimp hardware for multiple conductors?

I would appreciate pointers for locating ring and quick disconnect crimp hardware which are approved for multiple conductor use. I've had conversations with two major manufacturers so far. One confirmed a quick disconnect terminal family that supports multiple conductors provided that the summed

Re: [PSES] IEC 60320 adapter cable question

h this type of > adapter? > > > > *De :* Adam Dixon [mailto:lanterna.viri...@gmail.com] > *Envoyé :* 13 février 2017 18:59 > *À :* EMC-PSTC@LISTSERV.IEEE.ORG > *Objet :* Re: [PSES] IEC 60320 adapter cable question > > > > I have used Stayonline and have been pleased wi

Re: [PSES] IEC 60320 adapter cable question

I have used Stayonline and have been pleased with their breadth and quality of cord options. I don't think they carry part numbers for all of the countries that David mentions for mating with a C16 inlet ("notched C15" is the description on their site), but definitely worth a good look. Cheers,

Re: [PSES] safety standard - mobile inverters

What about IEC 62109-2 with emphasis on standalone (i.e. not grid-connected)? Regards, Adam in Atlanta adam.di...@ieee.org IEC 62109-2:2011 Safety of power converters for use in photovoltaic power systems - Part 2: Particular requirements for inverters On Thu, Feb 2, 2017 at 2:31 AM, John Woodga

Re: [PSES] add 60950 to a new supplier's product which only has FCC?

isting company B instead of company A in a new set of reports. The > labs will want copies of agreements and other paper work to make sure it is > only labels/model numbers that are different. > > Jim > > On Jan 29, 2017 4:18 PM, "Adam Dixon" wrote: > >> Simil

[PSES] add 60950 to a new supplier's product which only has FCC?

Similar to last year's Company A/B Multiple Listee for CE discussion, is there a good path to take a finished product built by Company A which only has FCC certification and have Company B add 60950 safety certification? Seems like it should be an "all or nothing" proposition (i.e. Company B repeat

Re: [PSES] lowest emissions 4k TV?

nificant CM voltage on the system. I’ve found > any number of commercially available cables and couplers that blow through > the emissions limits when used between an otherwise compliant source and > sink. > > > > *From:* Adam Dixon [mailto:lanterna.viri...@gmail.com] > *Sent:*

Re: [PSES] lowest emissions 4k TV?

In addition to the recommendations such as James', it may be worth some time looking at teardown videos (YouTube, iFixit, etc.) and FCC filings (the internal photos entry among all of the documents) to get an idea of construction. You won't know if you get a similarly well-performing sample like J

Re: [PSES] aluminum vs copper wiring

For related reading, there are reference materials from the Alumin(i)um Association. The handbook is a scanned copy of the 3rd edition (1989) and is large (21.5MB). Some of the other links may be helpful as well. http://www.aluminum.org/resources/electrical-faqs-and-handbooks/electrical Regards

Re: [PSES] [EXTERNAL] Re: [PSES] Automated vehicles.

John didn't say if the flying cars were self-flying or not. Some of us on the list might remember this episode "The Jetsons: A Date with Jet Screamer (#1.2)" (1962) [*George gets stuck in rush hour traffic on his way home from work*] *George Jetson

Re: [PSES] Operating temperature range for consumer electronics & electrical appliances

Hi, Scott, Apple informs its customers about temperature extremes and battery/device performance in an easy-to-find article titled "Keeping iPhone, iPad, and iPod touch within acceptable operating temperatures." Apple users in Norway should have the same hardware as those in the US, so should be

Re: [PSES] HDMI questions

742MHz sounds suspiciously like a harmonic of the 74.25MHz max TMDS clock rate for a Category 1 cable per the HDMI 1.3a spec. I don't have the HDMI 2.0 spec (not an adopter), but would love to know more about the test configurations. A few thoughts/tests: 4K resolution at lowest color depth (no

Re: [PSES] SV: [PSES] RE from Flat Panel ICs

The National Semi/TI parts have been used in dozens (perhaps hundreds) of laptop and LCD monitor designs over the past 12 years or so. The video scaler suppliers are very protective of their IP, so you are likely to find the most detailed information from the LVDS driver suppliers. You should hav

Re: [PSES] [RFI] Part 15 isn't enough..

tive, because CE requires conformity to all > applicable Directives and that includes the Low Voltage Directive. > > > > With best wishes DESIGN IT IN! OOO – Own Opinions Only > > www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England > > > > Sylv

Re: [PSES] [RFI] Part 15 isn't enough..

Reply to John's question about CE marking on products in US: Results from an early Saturday morning visit to local (Atlanta, GA) WalMart to look at product labels are: Televisions: no CE marking (FCC + UL was common to all six models from five manufacturers, majority of which would be considered

Re: [PSES] Fire ants

Follow the links available in Doug's original post to get to the Texas A&M article which references both electric and magnetic field influences. In my locale (Atlanta, GA), University of Georgia folks speculate the attraction is due to thermals (2013 AJC article: http://www.ajc.com/news/news/break

Re: [PSES] AMA Warns of Harm from LED Streetlights’ Blue Light

Lots of good comments in this threadas with many others over the years. For those interested in testing the theory, take a look at f.lux which is available for PC and tablet/cell phone environments. They have a short research page with some information. You'll see the obvious shift in co

Re: [PSES] Handheld or portable voltmeter/ammeter with built-in and adjustable limit function with audible alarm

Agilent has a DMM family (U1231 is $135 on Amazon) with configurable voltage threshold audible alert. See p104 of the User Guide. I don't have any of these Agilent meters, but perhaps another PSES colleague may elaborate? http://cp.literature.agilent.com/litweb/pdf/U1231-90026.pdf Regards, Ada

Re: [PSES] fire safety test methods for different country standards

723 (ASTM E84) amongst other things > > > > John E Allen > > > > *From:* John Allen [mailto:john_e_al...@blueyonder.co.uk] > *Sent:* 19 May 2016 18:31 > *To:* 'Adam Dixon'; 'EMC-PSTC@LISTSERV.IEEE.ORG' > *Subject:* RE: [PSES] fire safety test me

[PSES] fire safety test methods for different country standards

Apart from purchasing multiple standards, are there reference materials that may guide preliminary in-house fire safety testing (flame spread) for materials categorized as building components? I have come across summary descriptions of multiple test standards (BS476, ISO9705, ISO5660, DIN-4102, et

[PSES] power quality monitors/analyzers

I would appreciate recommendations for power quality monitors/analyzers to use for occasional field use. There are a couple of archive threads related to this (1999 and 2006) where a few manufacturers are shared. I've searched the web several times in the past few weeks and it appears that there

Re: [PSES] AC power cord label/traceability (UL)?

of a holographic label. On Sat, Jan 30, 2016 at 7:50 AM, Adam Dixon wrote: > I am trying to get a better understanding of cable traceability and would > appreciate any references to expand the four page UL ELBZ Guide Info > document for cord sets/power cords and a slightly longer UL Tracea

[PSES] AC power cord label/traceability (UL)?

I am trying to get a better understanding of cable traceability and would appreciate any references to expand the four page UL ELBZ Guide Info document for cord sets/power cords and a slightly longer UL Traceability Guide. I see a holographic label requirement but haven't located any detail regard

Re: [PSES] wet environment AC termination

Ns for this particular > classification, but cannot remember. > > Brian > > > From: Adam Dixon [mailto:lanterna.viri...@gmail.com] > Sent: Tuesday, December 01, 2015 10:33 AM > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: [PSES] wet environment AC termination > > I am lookin

[PSES] wet environment AC termination

I am looking at a design requiring a multi-branch AC cable for a wet environment. Is there a tiny form factor enclosure that would protect/terminate unused branch(es) for a minimal system configuration (i.e. using 3 of 4 branches)? I see a variety of hardware that are a bit too large (ex: generi

[PSES] hi-pot test for modular hardware?

Where would I find hi-pot test requirements for modular ITE (60950) hardware where multiple modules may be assembled into a larger system? I am getting first experience with a 100VA-rated AC hi-pot tester and have 100W power supplies with ~4-5mA leakage @ 2500VAC. I am wondering about modular sys

Re: [PSES] 208V/30A/3PH NEMA 3R power distribution question

hours of > engineering time, and $ in wasted material costs. > > Brian > > > From: Adam Dixon [mailto:lanterna.viri...@gmail.com] > Sent: Thursday, August 20, 2015 12:39 PM > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: [PSES] 208V/30A/3PH NEMA 3R power distributio

[PSES] 208V/30A/3PH NEMA 3R power distribution question

First-time post with an application question after getting guidance from many of you earlier this year about how/where to learn more about safety. So here goes.I would appreciate recommendations for either reference materials I should read or hardware options to convert a 208V/30A/3PH branch ci

Re: [PSES] Safety standards versus safety engineering

s. > > This listserv has had a few threads on knowledge resources. There are > other on-line discussions, such as the numerous LinkedIn groups. And the > many Bugs Bunny videos available on youtube. > > Brian > > > From: Adam Dixon [mailto:lanterna.viri...@gmail.com] >

Re: [PSES] Safety standards versus safety engineering

ing a recommended reading/standards list, I would appreciate any guidance/feedback. Kind regards, Adam Dixon adam.di...@ieee.org On Wed, Mar 4, 2015 at 9:30 PM, Richard Nute wrote: > Many years ago, a group of R&D engineers came to > me and said: "We want to learn about product

Re: [PSES] FCC EMI Test and Ferrites on Cables

I third this sentiment. I've seen wide variation in cable construction with respect to shell grounding and raw cable shield construction (foil types, braid % coverage). HDMI cables with ferrite cores are available at places like Monoprice, but they are definitely in the minority. A web search si