Re: [PSES] Are Australia/New Zealand approvals needed for IEC 60320 Appliance Inlet ?

This is subtle. If you’re selling appliance connectors as components in the Au/NZ market, they are likely treated differently than those appliance connectors that are only sold as part of equipment.  Mike Sherman  Sherman PSC LLC On 04/18/2023 11:31 AM Scott

Re: [PSES] Are Australia/New Zealand approvals needed for IEC 60320 Appliance Inlet ?

Be careful. Appliance connectors are AU Level 3 equipment . You can find the full list in AS/NZS 4417.2 . On Tue, Apr 18, 2023 at 9:27 AM Ryan Jazz

Re: [PSES] Are Australia/New Zealand approvals needed for IEC 60320 Appliance Inlet ?

Hello List Members, An update that the NRTL withdrew their request for the "Australia/NZ" approvals document for the appliance inlet The IEC certificate was acceptable. Sincerely, Ryan Jazz Ryan Jayasinghe Regulatory Compliance Engineer rjayasin...@line6.com "After

[PSES] Compliant needle-flame test material vs V-0 material

According to EN 62368-1 : 2020 + A11 : 2020 - Cl 6.4.8.4 Smaller distances are allowed provided that the part of the fire enclosure or fire barrier within the required separation distance complies with one of the following: • the fire enclosure or fire barrier meets the needle-flame test

[PSES] AW: [PSES] Are Australia/New Zealand approvals needed for IEC 60320 Appliance Inlet ?

Hi Ryan, If the national adoption of the IEC standard contains modifications, you need a CB report that approves compliance with these national deviations. According to the Australian Standards website, IEC 60320-1 has been adopted there with national modifications (AS/NZS 60320.1-2012 -

[PSES] Are Australia/New Zealand approvals needed for IEC 60320 Appliance Inlet ?

Dear list members, We are trying to get a CB Report for our guitar amplifier from our local NRTL. For the Australia/New Zealand deviations they are asking us to provide an 'Australia/NZ' approval document for the appliance inlet. Is this a new requirement, I always thought Australia/New Zealand

[PSES] 62368 Battery question

I have a product that uses 2 rechargeable C cell LiPo batteries that are not in  a single package.  Does or should each have a monitored NTC?  I believe yes bit seeking other thoughts. Thanks,Sent from my T-Mobile 5G Device - This

[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

Re: [PSES] How to Measure Surface Conductivity?

On Tue, 11 Apr 2023 15:45:29 -0400, Brian Kunde wrote: > I have been given two samples of metal plates; one plated in our current > material and the other with a new plating material we want to switch to in > production. I have been tasked to compare the electrical surface > conductivity. >

Re: [PSES] AW: [PSES] Safety: 60335-1 conflicting clauses question - earthing (or not) of handles

Hello Bernd, Thank you for the links to the additional material on the IEC website. I didn’t realise there was such a wealth of material in the documents from the subcommittees. Also, thank you for taking the time to write a considered reply. I understand your interpretation and the

[PSES] AW: [PSES] AW: [PSES] Safety: 60335-1 conflicting clauses question - earthing (or not) of handles

In my understanding this is just an informative note to the decision of the international IEC committee that the national committee of Australia and New Zealand has modified clause 22.35 in their nationally adopted version of 60335-1 (as can be seen on the Standards Australia website AS/NZS

Re: [PSES] AW: [PSES] Safety: 60335-1 conflicting clauses question - earthing (or not) of handles

For Australia and New Zealand; which have a reliable earthing system; it was agreed at the EL-002 (TC61 national committee) meeting in Wellington, February 2009 that this requirement does not apply to handles, levers and knobs, other than those of electrical components, provided that they are

Re: [PSES] How to Measure Surface Conductivity?

Hi Brian, You may want to consider repeating test #3 after environmental conditioning. The true test of a plating is corrosion resistance over time. Best of luck, Mark Stultz | CMSE | Sealed Air | Automated Packaging Systems | Streetsboro, OH | 330-342-2402 From: Brian Kunde Sent: Tuesday,

[PSES] AW: [PSES] Safety: 60335-1 conflicting clauses question - earthing (or not) of handles

Hello James, Thank you for providing this additional information and the sketch. My conclusion that the handles are a class II construction was based on your statement in your original post that the handles are not "reliably earthed". As I understand now from your additional information they

[PSES] Fw: Re: [PSES] How to Measure Surface Conductivity?

Conductive epoxy bonding the probe to the surface?Calibrate with a current shunt. "Colorado" Brian 720-450-4933 -- Forwarded Message -- From: Marko Radojicic <052300254e41-dmarc-requ...@listserv.ieee.org> To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] How to Measure

Re: [PSES] How to Measure Surface Conductivity?

I would measure ohms per square using a milliohm meter. Also, another critical parameter is how hard the coating is. If the new coating is much harder than the original, it will likely make for poorer conductivity at any seams, resulting in lower shielding effectiveness even if the material

Re: [PSES] How to Measure Surface Conductivity?

Try a conductive elastomer on the DMM probes. Intent is to not scratch the surface. However from your description, new coating appears functionally equivalent especially if bonding mechanisms use any type of sharp edge (BeCu gasket, screw, etc)Sent from my mobilePlease excuse brevity & grammar On

[PSES] How to Measure Surface Conductivity?

I have been given two samples of metal plates; one plated in our current material and the other with a new plating material we want to switch to in production. I have been tasked to compare the electrical surface conductivity. What is the best way to do this? How is this done in the industry?

Re: [PSES] Multiple electrical power sources

Hello Steve, Following up on Kevin’s message about IEC 62368-1, there are some requirements in Annex L (Disconnect Devices) L.8 Multiple power sources Where a unit receives power from more than one source (for example, different voltages/frequencies or as redundant power), there shall

[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

Re: [PSES] Multiple electrical power sources

Although related to the installation of products and not necessarily the product desgins themselves, you might review NFPA 70, National Electric Code. They do have requirements when using multiple sources. -Doug Douglas E Powell Laporte, Colorado USA doug...@gmail.com LinkedIn

Re: [PSES] Multiple electrical power sources

And in the telecom world we frequently used multiple AC cords, each one going to an outlet served by a different circuit breaker to make sure the switch or multiplexer did not go down. They fed individual power supplies that fed a common power bus. Covered by IEC 950 and later standards.

Re: [PSES] [EXTERNAL] Re: [PSES] Low Voltage connectors called out on CCL

Hello Ryan, Maybe connectors are filling opening in fire enclosure and therefore they have to have appropriate flammability class or approval according to relevant connector standard. It also depends on classification of the circuit they are connected to. If it is ES1/PS1 and connectors

Re: [PSES] Multiple electrical power sources

Hi Steve, Below is link to official ISO symbol for multiple power source. https://www.iso.org/obp/ui/#iec:grs:60417:6172 Best regards, Boštjan From: Richard Nute Sent: Friday, April 7, 2023 2:15 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Multiple electrical power sources CAUTION:

Re: [PSES] Multiple electrical power sources

Thanks for your responses. Sent from my T-Mobile 5G Device Original message From: Steve Brody Date: 4/6/23 4:41 PM (GMT-05:00) To: PSES List Server Subject: Multiple electrical power sources A new question. A client's product is using two

Re: [PSES] Multiple electrical power sources

You might want to take a look at UL/IEC/EN 60950-1 which I know definitely has requirements for multiple power sources. 62368 may have guidance as well Get Outlook for iOS From: Richard Nute Sent: Thursday, April 6, 2023 8:15:02 PM To:

Re: [PSES] Multiple electrical power sources

Hi Steve: The TV broadcast industry electronic products have used two (redundant) AC sources for their products for many years. You may have some help there. Rich From: Steve Brody Sent: Thursday, April 6, 2023 1:42 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES]

Re: [PSES] [EXTERNAL] Re: [PSES] Low Voltage connectors called out on CCL

Hello Rich, Like to thank you and the all the rest for your replies. We are still not out of the woods. It certainly help to have a copy of UL 62368-1 when trying to present reasons. (always with most standards) Sincerely, Ryan Jazz Ryan Jayasinghe Regulatory Compliance Engineer

[PSES] Multiple electrical power sources

A new question. A client's product is using two independent AC power sources on a product, but I can't find anything in 61010-1 60204-1 that provide any guidance on compliance. The obvious is that the sections of the product that are fed from source A or B are not interrelated in any way that

Re: [PSES] Question for FCC Part 18 RE test?

If it is a Part 18 device the lab is probably misapplying FCC 15.31 (f)(2), which gives a 40 dB/decade factor. Part 18 is 20 dB, unless multiple distances are used as Tom pointed out below. Thanks, [ElementSignature] [cid:image554720.jpg@6ED1BEFC.58F12BBE] David Schaefer​ Technical Manager

Re: [PSES] Low Voltage connectors called out on CCL

Hi Ryan: UL makes some of its money through certifications. Regardless of product safety, components, including connectors, are certified; their required use in end-products justifies the requirement for certification of those components. So, this is one of those unwritten requirements.

Re: [PSES] Low Voltage connectors called out on CCL

The NRTL should be compelled to point to the words in the standard that justify their demand. It should not be up to you to search for it. == Best wishes John Woodgate OOO-Own Opinions Only www.woodjohn.uk

Re: [PSES] Low Voltage connectors called out on CCL

Hi Ryan; Could the connectors be considered as filling holes in the fire enclosure (or making up part of the enclosure)? -Ken A On Thu, Apr 6, 2023 at 2:09 PM Ryan Jazz wrote: > Hello Members, > > We have an audio amplifier being evaluated by a local NRTL to UL 62368-1 3 > rd Edition. > > The

[PSES] Low Voltage connectors called out on CCL

Hello Members, We have an audio amplifier being evaluated by a local NRTL to UL 62368-1 3rd Edition. The NRTL is calling out all the low voltage connectors on the rear panel on the Critical Components list. For example the XLR and TRS connectors. * Can someone please let me know where this

Re: [PSES] Question for FCC Part 18 RE test?

Refer to FCC MP-5 for information regarding testing at distances other than what is specified in FCC Part 18. https://www.fcc.gov/general/equipment-authorization-measurement-procedures Bill Stumpf Technical Manager D.L.S. Electronic Systems, Inc. 847-537-6400 x281

[PSES] WG: AW: [PSES] AW: [PSES] Safety: 60335-1 conflicting clauses question - earthing (or not) of handles

Hi James, Please find below some additional thoughts on the subject that have accidentally been discussed off-list. Kind regards, Bernd Von: Dürrer Bernd Gesendet: Donnerstag, 6. April 2023 11:36 An: John Woodgate Betreff: AW: AW: [PSES] AW: [PSES] Safety: 60335-1 conflicting clauses

Re: [PSES] Antenna tilting or bore sighting for radiated emissions

Hi Larry, Thanks a lot for your insightful comments. Yes I'm familiar with the setup and with the antenna 3dB beamwidth. My question aims to help me estimate how much is it worth the investment in a mast with tilting or boresighting capability for our 3m semi-anechoic chamber. Most of the tests

[PSES] AW: [PSES] Safety: 60335-1 conflicting clauses question - earthing (or not) of handles

Hi James, actually, these two clauses address two different, but related risks: Clause 22.35 addresses the risk that the handle itself may become live. In any case, a conductive surface (like the handle) has to be separated from live parts by basic insulation. Due to the higher risk that

Re: [PSES] Safety: 60335-1 conflicting clauses question - earthing (or not) of handles

On Wed, 5 Apr 2023 11:23:03 +0100, "James Pawson (U3C)" wrote: > In running through some safety checks on a customer's product I've come > across what appears to be a conflict between two clauses. This resulted in > some head scratching! I'm sure it is my misunderstanding or misreading, but >

Re: [PSES] Question for FCC Part 18 RE test?

On Thu, 6 Apr 2023 11:32:20 +0900, Youngsik Kim wrote: > According to FCC part 18.305 FIELD STRENGTH LIMITS, a test article of Any > type unless otherwise specified has a measurement distance of 300 meters, > but I want to measure it at a distance of 3 meters because I need to > measure it in

Re: [PSES] Question for FCC Part 18 RE test?

Not an expert on that standard, but technically speaking. If indeed both 300 meter and 3 meters are both in the far field of the transmitting antenna, then the scaling is as 20 log (distance ratio). That would yield a 40 dB relaxation, so your first answer is correct. I cannot think of a case

[PSES] Question for FCC Part 18 RE test?

Hi Experts According to FCC part 18.305 FIELD STRENGTH LIMITS, a test article of Any type unless otherwise specified has a measurement distance of 300 meters, but I want to measure it at a distance of 3 meters because I need to measure it in a chamber. In this case, what is the limit at 3 meters?

Re: [PSES] Safety: 60335-1 conflicting clauses question - earthing (or not) of handles

I'm not an expert in that standard, but at first glance it looks to me like it makes a distinction between handles that are held or actuated in normal use vs handles that are *continuously* held in the hand in normal use. Similar to distinction made for surface temp limits in standards like 60950.

Re: [PSES] Safety: 60335-1 conflicting clauses question - earthing (or not) of handles

I may be missing something but the way I read it they provide you with two different approaches to reducing the hazard of electric shock. One is protective earth grounding, and the other is double insulation, or double electrically isolated. These are mutually exclusive, being two different

Re: [PSES] Safety: 60335-1 conflicting clauses question - earthing (or not) of handles

How exactly does one measure "likely" as in likely to touch? Is it a %age? Of course my question is tongue in cheek... On Wed, Apr 5, 2023, 4:23 AM James Pawson (U3C) wrote: > * This message originated outside of DISH and was sent by: > ja...@unit3compliance.co.uk * >

[PSES] Safety: 60335-1 conflicting clauses question - earthing (or not) of handles

Hello experts, In running through some safety checks on a customer's product I've come across what appears to be a conflict between two clauses. This resulted in some head scratching! I'm sure it is my misunderstanding or misreading, but I could do with some pointers in how to unpick this.

[PSES] protective earthing terminal

Dear experts, What are your experiences about protective earthing terminal according IEC 62368-1? Unit provides 2 earthing terminals. One as a stud/bolt directly on the enclosure. This provides reliable connection to PE and fulfils all requirements of the standard. Second one on the input

Re: [PSES] Ferrules

Thanks to those who responded to my inquiry. Sent from my T-Mobile 5G Device Original message From: sgbrody Date: 4/3/23 3:46 PM (GMT-05:00) To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Ferrules Hi all,I have a 3rd party who is requiring 94V-0 on the ferrules of a

Re: [PSES] Ferrules

Hi Steve: More than you need to know about ferrules and UL 508: https://www.youtube.com/watch?v=3B09qSLek8Q I suspect that few commercially available ferrules are V-0. I found ferrules that were nylon or vinyl. Nylon is HB. However, UL certifies ferrules, UL 486F. Para.

Re: [PSES] Ferrules

The end product Standard usually indicates minimum flame ratings. Also, many Standards allow a end product flame test if the material rating is lower than required. Typically (per UL 746C) – 94HB minimum for attended use products. 94V-2 minimum for unattended use, cord connected products.

Re: [PSES] Ferrules

Panduit PAN_TERM with vinyl insulation is UL 94V-0, John Cochran Compliance Manager jcoch...@strongarm.com [https://strongarm.com/strongarm-designs-logo.png] Industrial workstations and mountings for the frontline workforce. Strongarm

[PSES] Ferrules

Hi all,I have a 3rd party who is requiring 94V-0 on the ferrules of a connector.  Up to now the ferrules being used have been HB.What say ye, esteemed experts?Opinions, comments welcome.Sent from my T-Mobile 5G Device - This

Re: [PSES] X-Caps after Diode Bridge

Brian Use of X cap after bridge rectifier is not required. There exist OSM decision that clarifies this. Y caps are required in complete primary circuit towards PE. I hope this helps. Best regards Boštjan Glavič SIQ Poslano iz Outlook za Android

Re: [PSES] e-Labeling

>From 4.5.1.4 of the 2022 Blue Guide (emphasis mine): Regulation (EC) No 765/2008 and Decision No 768/2008/EC lay down that the > CE marking must have the dimensions, format and proportions defined in > Annex II of

Re: [PSES] X-Caps after Diode Bridge

Hi Brian: I found these explanations on the web: https://www.tecategroup.com/products/capacitors/ac-safety-capacitors.php X Capacitors: Also known as "across-the-line capacitors." Class X safety capacitors are used between the "live" wires carrying the incoming AC current. These

Re: [PSES] e-Labeling

Hi Peter, The below page indicates which labels exist: https://europa.eu/youreurope/business/product-requirements/labels-markings/index_en.htm How do you affix the CE label: The CE marking

[PSES] X-Caps after Diode Bridge

We use X2 caps in RF filters prior to the Diode Bridge. Do filter caps after the Diode Bridge (DC), but before the isolation transformer, have to be X2? How about filter caps to Chassis/PE after the Bridge? Do they have to be Y-caps? Thanks, The Other Brian PS: We typically buy power

[PSES] e-Labeling

Hello group, Does anyone know if EU accepts e-Labeling for IT products?  Thank youPeter - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to

[PSES] SV: [PSES] Comtest Architectural Shielding

Thanks Doug What kind of problems could we expect in a room with spec «"Typical > 40dB of shielding effectiveness"? Noise from sources outside the chamber? Not possible to make an ambient measurement without a lot of noise coming in from the outside environment? Best regards Amund

[PSES] SV: [PSES] Comtest Architectural Shielding

Thanks Ken, The EUTs are typical laptop size, WiFi/BLE SoC and other electronics. Mainly interested in measuring from 30MHz to 1GHz, even the 2. and 3.harm. og 2.4GHz is interesting as well. Just pre-testing. Make a golden sample EUT to compare measurements in an accredited room vs. this

[PSES] Question concerning Accredited test reports.

Good day everyone, I hope this finds you well. We have been pursuing ISO 17025 accreditation for an EMC test facility and one standard on our scope is IEC 61326-3-1. We have been trying to avoid using standards that are not EN’s so is there any reason we should have both IEC 61326-3-1 and EN

Re: [PSES] Antenna tilting or boresigjting for radiated emissions

Previous comments restrict the issue to microwave frequencies and a double-ridge guide horn. I believe this issue first came up when transitioning from dipoles to higher gain antennas below 1 GHz, such as log-periodic arrays. The same concept applies to LPAs. Ken Javor Phone: (256) 650-5261

Re: [PSES] Antenna tilting or boresigjting for radiated emissions

It is in both C63.4 and C63.10 for above 1 GHz (so not a semi anechoic chamber due to the absorber on the ground plane). C63.4 Clause 8.3.2.2 The final measurements are performed on a site meeting the requirements of 5.5. For measurements above 1 GHz, use the cable, EUT arrangement, and mode

Re: [PSES] Antenna tilting or bore sighting for radiated emissions

Paolo, I’m going to go on some assumptions here that you are familiar with the measurement setup and process in Part 15 and ANSI C63.4:2014. If you look in section 8.2.4 there is a discussion on antenna beamwidth You need to keep the antennas within their 3 dB of radiation or reception also

[PSES] Antenna tilting or boresigjting for radiated emissions

Hi all, Is there an FCC / ANSI requirement, or maybe just recommendation, for antenna tilting or boresighting wrt radiated emissions in a semi-anechoic chamber ? If yes, can you please get me the reference section in FCC Part15 or ANSI std or somewhere else? Thanks a lot in advance! Paolo -

Re: [PSES] Comtest Architectural Shielding

Amund, I remain a little skeptical of this type of shielding and I personally would want to witness some testing where these shielding claims are made. It may be useful for E-fields, but my suspicion lies with H-fields. Some years ago, there was a company that claimed their conductive spray

Re: [PSES] Comtest Architectural Shielding

Used similar materials or build EMI ³tents.² They worked quite well, but we needed just a little shielding effectiveness. The SE for a structure will always be limited by the treatment of seams and apertures. The SE inherent in the conductivity of the metal or metalized fabric is not the limiting

[PSES] Comtest Architectural Shielding

Please check out the datasheet attached. Anyone here in the forum that have experience with this type of shielding? The goal is => a manufacturer wants to build a pre-testing site in-house (5m x 2m x 2m). Thanks for any comments. BR Amund -

[PSES] FW: [PSES] Non-NRTL Field Inspection Service Provider in the Michigan / Midwest Region

FYI. From: Roland Gutzky Sent: Friday, March 24, 2023 1:32 PM To: char...@sulisconsultants.com; ri...@ieee.org Subject: FW: [PSES] Non-NRTL Field Inspection Service Provider in the Michigan / Midwest Region Hi Folks, One of my colleagues passed this thread to me as he follows the

[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] Test lab will not test devices with LiPo batteries

I was in touch with a test lab lately regarding environmental testing (shock, temp cycling, etc.) a device with internal LiPo batteries. They were very concern about testing such device, because if could cause fire, explode, etc. during test. They did not want to test devices which contained

Re: [PSES] Maintaining UL Label when Modifying Electrical Enclosures in the Field

I see this as either a configuration change or retrofit. My experience is that as long as any changes (mods, substitutions, etc) you make are in a configuration already approved by UL, and your technical files are updated, then the impact should be minimal. Oh, and this should also be done by

Re: [PSES] Maintaining UL Label when Modifying Electrical Enclosures in the Field

Ronan, OSHA published a Safety and Health Information Bulletin on this topic. It is available here https://www.osha.gov/sites/default/files/publications/shib021610.pdf Get Outlook for iOS From: Ronan Shanley

Re: [PSES] Maintaining UL Label when Modifying Electrical Enclosures in the Field

Hi Ronan, Despite the UL508A Panel Program being a generic program, changing any NRTL labeled product in the field technically void's the mark. However, based on your description of the change, following comes to mind before being able to provide any consultation - 1. What is the

Re: [PSES] Maintaining UL Label when Modifying Electrical Enclosures in the Field

Hi Ronan, You are changing the product from await was listed so it would need a field evaluation. I would ask one of the labs that does field evaluation but seems pretty straight forward that since you are modifying the product from what was originally tested would need a field evaluation.

[PSES] Maintaining UL Label when Modifying Electrical Enclosures in the Field

Hi All, I have a question about maintaining the UL label on electrical enclosures when modified in the field. We have our electrical enclosures built at a UL 508A shop. We have a minor change to the design where we are removing a pushbutton from the front of the enclosure. We will update the

Re: [PSES] ROHS Lead Exemption Expires 2024 (e.g. metal film resistors)

Just checked more closely and looks like I might have just happened to see an exception to the general rule last time I looked. I can find a general-purpose “truly lead-free” Yageo 0402 10kΩ selling for $5.73/1000 on Digikey while the conventional series is $2.14/1000, e.g. In this instance,

[PSES] [urgent] ISO noise & vibration testing services in Nevada

Dear colleagues- Can anyone on this list recommend a mobile testing service located in the state of Nevada, or willing to travel from adjacent state, equipped to test to these standards?: *ISO 6393 Earth-moving machinery - Determination of sound power level - Stationary test conditions *ISO

[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

[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] AW: ROHS Lead Exemption Expires 2024 (e.g. metal film resistors)

Hi Elliott, you can check the legal status of RoHS exemptions at Implementation of the RoHS Directive (europa.eu). There you will find an Excel list for download that will show the

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

Hi Brent and the group. I agree as long as we stay under 8 KV. For 20 kV discharge, I would use a (easy to build) filter that slows the rise to that more like a real discharge. Nice repeatable contact discharge that more closely resembles reality. Doug Smith Sent from my iPhone IPhone:

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

I'll jump in quickly to state my opinion: Contact discharge does not represent any "natural" mechanism I know of, but I prefer it because it seems to have the highest repeatability in revealing a device's vulnerability. -Brent, "If I can't be 'right', I at least want to be consistent about

Re: [PSES] EU and UK DoC

Hmmm interesting problem!! On Wed, Mar 1, 2023, 12:29 PM < 06cee064502d-dmarc-requ...@listserv.ieee.org> wrote: > * This message originated outside of DISH and was sent by: > 06cee064502d-dmarc-requ...@listserv.ieee.org > <06cee064502d-dmarc-requ...@listserv.ieee.org> * >

[PSES] Functional Safety

Hi everyone, We are in need of a Functional Safety consultant for contract work. Please reply as appropriate. If you have any questions, please don't hesitate to contact me. Best Regards and Be Safe, John John Allen | President & CEO | Product Safety Consulting, Inc. Your Outsourced

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

Good points John. On Mon, Mar 6, 2023, 7:58 AM John Woodgate wrote: > * This message originated outside of DISH and was sent by: j...@woodjohn.uk > * > -- > > There are two good points about 61-4-2:the test results are repeatable > and products that pass the

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

There are two good points about 61-4-2:the test results are repeatable and products that pass the tests rarely suffer from ESD failures in the field. But there are, even so, unresolved issues and doubts about the relations between the tests and actual ESD events. Because the present

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

Don't forget the seminal research done by WMKing on this topic. He was I believe the first to measure the fast response of an ESD event through a metal intervening object. Also, it is understood that the ESD test was a consensus output in an attempt to provide repeatability within test houses.

[PSES] ROHS Lead Exemption Expires 2024 (e.g. metal film resistors)

Is the general consensus that the exemption will be extended or go into effect? I find it interesting that the truly lead-free resistors often sell for less than the old ones (probably less demand as BOM changes are slow) - This

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

Yes, 61000-4-2- is not very good, but while you are reluctant to share your knowledge with the committee, it is unlikely that anything will happen. == Best wishes John Woodgate OOO-Own Opinions Only

[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] Can anyone tell me what this symbol means?

Doug, Can there be love without attachment … or attachment is the first step to love or love begins attachment… Sudhakar Wasnik, > On Mar 3, 2023, at 8:28 AM, Douglas Nix > <0bb8ff993b10-dmarc-requ...@listserv.ieee.org> wrote: > > All, > > I just got confirmation from the engineer

Re: [PSES] [EXTERNAL] Re: [PSES] EU and UK DoC

Thank you all. We will do one PDF with couple of pages as that seems to be a safer bet. -Original Message- From: Charlie Blackham To: EMC-PSTC@LISTSERV.IEEE.ORG Sent: Wed, Mar 1, 2023 2:21 pm Subject: Re: [PSES] [EXTERNAL] Re: [PSES] EU and UK DoC Dan   You might not have had it

Re: [PSES] Flammability Rating for Plastics V0 vs V1

Yes, 'simply'. It's not good enough, and even with the support of the UK National Committee secretary (a graduate chemist), I could not get the matter even discussed for IEC 60950 (it was that long ago!). Contrast that with the (spurious and misleading) table of electrochemical potentials,

Re: [PSES] Flammability Rating for Plastics V0 vs V1

I work mainly in electrical safety standards and the term polycarbonate is not commonly used. Instead they simply say polymer, plastics, or something generic like that. As for flammable materials, the standards I work with normally require 94 V-0 for anything in direct contact with high power or

Re: [PSES] Can anyone tell me what this symbol means?

All, I just got confirmation from the engineer who created the drawing that that symbol is indeed a heatsink. Thanks all for your responses. Doug Nix d...@mac.com (519) 729-5704 "Attachment is a form of dependency based on ego; love is non-attachment based on spirit." - Deepak Chopra > On

Re: [PSES] Can anyone tell me what this symbol means?

I would agree with Dan, looks like a notation for a heatsink. The pinout looks like a surface mount MOSFET so I would guess the meaning as "requires heatsinking / thermal spreading as part of PCB structure" If part of a DC/DC converter or power supply this is a good way to connect a high

Re: [PSES] Flammability Rating for Plastics V0 vs V1

Cecil -- Your inquiry is a bit broad, so it's hard to provide specific answers. If the polycarbonate parts are part of electrical equipment, you should be able to find flammability requirements in the safety standards used for that equipment in the intended markets. If the polycarbonate is

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