Re: [PSES] IEC 62368-1: To understand chapter 5.4.11

I have been watching this subject for a while. i vaguely recall that in some front matter in some standards is a statement that indicates that this is the minimum requirements to go to market. So in the interests of the Corp/s that I worked for at the time, and any quality targets, that they

Re: [PSES] I would like to hear your thoughts please

esting.     Best regards, -Lauren Confidential – Limited Access and Use From: Bill Owsley <00f5a03f18eb-dmarc-requ...@listserv.ieee.org> Sent: Friday, April 12, 2024 1:19 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] I would like to hear your thoughts please   |  

Re: [PSES] I would like to hear your thoughts please

The usual response is that it depends... More 'light' reading !  To start ! https://www.fcc.gov/sites/default/files/32-KDB-996369-Modules-TCB_Oct_2023.pdf On Wednesday, April 10, 2024, 5:22:12 PM EDT, Lfresearch <00734758d943-dmarc-requ...@listserv.ieee.org> wrote: Sorry for the

Re: [PSES] Radiated Emissions - How many points to QP?

It reads like there are two limits, peak and QP.  Go over either one and by how many and by how much over, does not matter.  it is a fail and fix it. Otherwise, the lab should be recording the 6 points of each P and QP for 12 points, well,  let the slide if all points are below the QP limit and

Re: [PSES] Radiated Emissions - How many points to QP?

generally, 2 limits, QP and P which is 20 db above QP.  Gotta meet both.  Unless the P is so infrequent as to call it a Click.  Which I would not to want a challenge over. On Friday, April 5, 2024 at 03:53:43 PM EDT, Stultz, Mark <0f79f2e10e47-dmarc-requ...@listserv.ieee.org> wrote:

Re: [PSES] Conducted emissions for Split-phase 120/240V needs three-phase LISN?

ps.  Old knowledge from old prior career experiences. I use arc welding cables for connections, not 4 ga wire that takes a pipe bender to work into place. Welding cables, are multi wire, and that means "multi" with a capital. Very flexible and capable of very high amps.  It is for arc welding

Re: [PSES] Conducted emissions for Split-phase 120/240V needs three-phase LISN?

Long ago, the company had the budget, so we bought single phase for each line. Thinking that we did not want any cross talk interference, which we had already experienced in the real world. Then we also had built the various configurations for supply power that we used.  In essence measuring

Re: [PSES] I would like to hear your thoughts please

we had a pre-compliance chamber, well correlated to compliance labs. so our inside pre-compliance testing is easy.  a bit of capital to get there. We make quick scan on about every variation to get idea of the worst. Then the rest of our attention is on the version. Our goal is not detectable,

Re: [PSES] Magnetic fields, human exposure standards, and pacemakers

Recall from school that the H field roll off is third order.  The size of the magnets is small, about 1/8 inch on the ones I have.For comparison, the speaker magnetics in some smart phones are a bit larger and stronger.  And the phone NFC, near field communication, uses AC magnetic fields. Oh,

Re: [PSES] Surge Protection Device required by NEC

I am a bit fuzzy on the details, but spd internal to machine has to meet a certain requirement, while if mounted outside, it met another requirement.The outside one was "easier".So a surge box was installed outside of machine.  Sent from Yahoo Mail on Android On Tue, Nov 1, 2022 at 16:02,

Re: [PSES] Measurement of X and Y capacitors for electric shock

A personal history, as intern/coop student, circa 1980-81, I was tasked with trying to capture the cap voltage just after disconnect.  Because a consumer complained about getting shocked.  Engineers general thoughts were it decays fast enough to not be a problem, and that ought teach the

Re: [PSES] China package and shipping labels

speculation, china will ship anything, that you ask for to be labelled. Ir is the import requirements that are important. And you are responsible to ensure that the labeling is correct. Sucks to be you !!! I spent several years in US customs monitoring programs because of a lack of attention to

Re: [PSES] NRTL Marks on Industrial Pump Assemblies

crazy making by AHJ's that have no engineering knowledge. Electric motors, certainly. physical: pumps, any of the variety I am familiar with, have no hazards for safety. Even when stalled and pumping no where. As a system, there might be a problem.  Assume that is a system approval and is custom

Re: [PSES] ESD generated by rotating turntable

ESD from flush mount rotating table.  Floor mounted power receptacles were cabled to avoid brush noise from power connections.  Cables in the crawl space under the raised floor, slide about as the turntable rotated, and the generated a static charge on cable insulation.  Discharges could be

Re: [PSES] Dual antenna during RE test ?

are a great start.  Has anyone attempted dual antennas for susceptibility/immunity? -Patrick. On Thu, May 5, 2022 at 10:52 PM Bill Owsley <00f5a03f18eb-dmarc-requ...@listserv.ieee.org> wrote: No clue as to what your thinking is about using multiple antennas in testing. We used 4 masts, hig

Re: [PSES] Dual antenna during RE test ?

al antenna for radiated susceptibility(i.e. immunity ). The insights on emissions are a great start.    Has anyone attempted dual antennas for susceptibility/immunity?   -Patrick.   On Thu, May 5, 2022 at 10:52 PM Bill Owsley <00f5a03f18eb-dmarc-requ...@listserv.ieee.org> wrote: No clue

Re: [PSES] Chasing a specific frequency

as much as you have, and the peak amplitude won't change. Take care, Brent DeWitt On 5/6/2022 12:10 AM, Bill Owsley wrote: If you set the step function to the 63 MHz freq, and then step up, BW set a little wide to account for slight inaccuracy, do you find more emissions, energy, har

Re: [PSES] Dual antenna during RE test ?

a beer. On 5/6/2022 1:57 AM, Bill Owsley wrote: Tried the dual antennas to subtract out the ambients, several times since the explanation was good. About 20 years ago.  Unsat !!! On Monday, May 2, 2022, 02:23:26 PM EDT, Ken Javor wrote: Likely a totally

Re: [PSES] Dual antenna during RE test ?

Tried the dual antennas to subtract out the ambients, several times since the explanation was good. About 20 years ago.  Unsat !!! On Monday, May 2, 2022, 02:23:26 PM EDT, Ken Javor wrote: Likely a totally different application than yours, but a long time ago on OATS

Re: [PSES] Dual antenna during RE test ?

No clue as to what your thinking is about using multiple antennas in testing. We used 4 masts, high band and low band at 3 m and 10 m.. NSA came out fine.  Been doing it for about 3 or more decades. If ya gots the money, spend it on more hardware. One radiated run in about 30 minutes cover high

Re: [PSES] Trouble with IEEE Xplore

Yup, same here.  quit using it years ago. On Wednesday, April 13, 2022, 01:49:11 PM EDT, Richard Nute wrote:   What happens is that I sign in, find the paper, click on 'PDF', putting the paper in my cart, then I click on the 'Purchase' tab. That takes me back to the sign-in page

Re: [PSES] Fuse designations

connects, and each in-rush caused a slight slip.  5-10 turn on's and it would open.  Power supply engineers found a way to limit in-rush current to avoid the condition. Saw this in-rush issue over and over in the following decades. Bill Owsley EMC First LLC On Wednesday, March 2, 2022, 05

Re: [PSES] SV: [PSES] SV: [PSES] Numbers of insulation layers in transformer (IEC62368)

First I am not a safety engineer, but I have met a few. Insulation specs that I have run across in pcb layouts, creepage and clearance, etc, such as between layers, or if the layers are like wires or other parts, there is, or was, mentioned in an obscure passage ( I paraphrase) that air and

Re: [PSES] CE marked products

We handled the power cords as separate items with their own approvals. And depending on the country the product was being shipped to, the correct power cord was added to shipment.  If a citizen is moving a product from country to country, it is their problem to get the correct power cord for

Re: [PSES] RoHS III references on the DoC?

And if asked to provide evidence, documents, etc backing up the declaration, there will be a limited time to do so. Management might take the position to get the doc's when asked, and hope that they are indeed in compliance. The consequence can be banned from the market for a period. That

Re: [PSES] US vehicle EMC regulations

s to build their specified test equipment AND pass their test item through the requirements.  And they don't help nor provide hints.  All you get is a pass/fail result. It makes NARTE a grad degree - from kindergarten ! - Bill Owsley EMC First LLC (Jan 2022) On Friday, December 17, 2021, 1

Re: [PSES] US vehicle EMC regulations

pper spark plug wires and radios with tubes that used a vibrator (old style) to generate AC to then generate the correct DC needed to run the radio ? And listening to AM with cars around you ?   Buzzzing noise ! ps. The EU is quite different. - Bill Owsley EMC First LLC (Jan 2022) On Friday

Re: [PSES] SV: [PSES] Max Hold Quasi-peak ?

There are two reasons for spread spectrum techniques.  One contributed to by the lady movie star, for avoiding detection and interference and which is used by all sorts of digital communications today as directed by several standards.  The other, patented by IBM, is used deliberately to

Re: [PSES] IEC 62368-3:2017 evaluation of USB 2.0 ports

Old story, mid 80's, when PC's were being placed on every desk as office work stations. Two different separate events occurred. The high volume of switching power supplies feeding off the big inhouse transformers caused some heating issues due to harmonics, etc.  Thus the harmonic standard.

Re: [PSES] My new Odysee technical channel

Typical lightning is about 300 million volts and 30 thousand amps.  And if you are within several 10's of feet of a strike, it makes an impression.  So a scaled down version is useful, like Doug's emp generator.  Useful for imaginative coupling into various devices under test.   Sent from

Re: [PSES] EMC and Scalar Waves - Friday Pondering

Hmmm, increase the air exchange in the basement and monitor the Radon levels, tho at this juncture that may be a moot point !   ;^) Aside; I did do a search and found a number of articles and with a quick survey in reading them, found that they use an english dielect, or structure, I am not

Re: [PSES] Post Brexit Day Jan 31 2020, where is UK going with CE mark?

Maybe it will go better than the transition to the RED. On Thursday, February 13, 2020, 05:54:13 PM EST, Ken Shadoff <1050c4779b94-dmarc-requ...@ieee.org> wrote: Be sure to consider your labeling requirements as a UK importer (a name and address in the UK). There is a UKCA mark

Re: [PSES] Cable question, or 'foiled' again

I agree.  Have found the assembly violated creepage and clearance requirements, and other construction, setup issues. On Tuesday, January 21, 2020, 01:49:46 PM EST, Richard Nute wrote:   Hi Steve:   I suspect that the test was set up incorrectly, especially since your client has

Re: [PSES] 80/80 rule

The 80/80 rule was/is applied for auditing manufacturing as, according to management, 'good enough for government work.'  They figured the risk of getting caught was sufficiently low enough to continue shipping. Initial testing has no allowance for exceeding the requirements. An experienced

Re: [PSES] 80/80 rule

Way back, some statistic guru said it reads as 80 percent confident that 80 percent of the samples will comply  with the requirement. On Monday, November 18, 2019, 03:03:12 PM EST, John Allen <09cc677f395b-dmarc-requ...@ieee.org> wrote: Quick search on “80/80 rule history”

Re: [PSES] 80/80 rule

oh, and I have no references. It was just standard practice.   On Monday, November 18, 2019, 02:36:38 PM EST, Bill Owsley <00f5a03f18eb-dmarc-requ...@ieee.org> wrote: We used it back in the early 1980's. Applied it to sample size for audits.   On Monday, November 18

Re: [PSES] 80/80 rule

We used it back in the early 1980's. Applied it to sample size for audits.   On Monday, November 18, 2019, 02:28:38 PM EST, Mark Gandler wrote: John,   would be beneficial if you can share your earliest recollection of the dates, besides stating it dates back much further.  

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

exactly what voltage the air discharge happened at. You can also use it to charge objects, like me, to known voltages (just did that for some ESD research, and also use it for a high voltage breakdown tester.   Doug   From: Bill Owsley <00f5a03f18eb-dmarc-requ...@ieee.org>

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

One example that comes to mind, out of a long history of wonderment in ESD testing, is for an air discharge, pulling the trigger causes the product to glitch, before approaching the product target point. Found a way around the anomaly, to find not problem with the actual air discharge. But

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

My experience, is that all brands, commercial and custom private built, will all make for different results. The ESD generators can all make the required waveforms as poorly defined and tested. Yet each different brand or model will give different results. Why ?  Incomplete performance

Re: [PSES] Grounding of metal cabinet

Our safety regulators have insisted that power cord safety ground/earth go first to the metal chassis, with rare exceptions.  Exception, the majority of chassis is plastic, with internal metal structures to tie it all together. Only the screw heads are exposed and tied to some of the internal

Re: [PSES] Do We Need Flame Retardants in Electronics?

Many years ago, we used the EMC grill, top and bottom of chassis, coated with an intumescent material that swelled with heat above a certain temperature to shut off the air flow and starve the fire.  Max ventilation was essential to normal operation, thus the coating for a fire condition, also

Re: [PSES] Intentional radiator Class A or Class B

Not having access to the standards for review... I would think that unintentional limits, 55032? would be a little different than intentional limits, 300 328?  memory fault. I am assuming the BT is operating in the 2.4 GHz band.  Does it operate in any other band? And I don't recall Class A and

Re: [PSES] Intentional radiator Class A or Class B

My answers for this are USA/FCC centric due to the nature of questions.  ps. Canada goes along too. So a composite system would be mutually exclusive; when operating as a Class A unintentional radiator, the BT, BlueTooth? the radio must not operate.  Assuming a non-residential environment for

Re: [PSES] Intentional radiator Class A or Class B

Subpart C, Intentional radiators does not have a distinction for Class A/B. Subpart B, Unintentional radiators has that distinction, allowing Class A for non-residential environments. Curiously, in subpart C, the general limits to be complied with are the same levels specified in subpart B for

Re: [PSES] Frequency range for conducted emissions

radiated emissions go a bit lower. §15.209   Radiated emission limits; general requirements. (a) Except as provided elsewhere in this subpart, the emissions from an intentional radiator shall not exceed the field strength levels specified in the following table: | Frequency (MHz) | Field

Re: [PSES] Ground on ship

"ground" terminology from what I have seen, it a power company concept, (you know, the 50/60 hertz AC power distributed all over).  They started out, and still in some rural areas, use earth as the "ground" for the return of the AC power being provided to users.  I can right now today in 2019,

Re: [PSES] Standards for large vehicle chargers?

The standard response is, it depends... Was looking into this last week. Check the FCC KDB. Communications? or not ? etc. etc...  Freq, power, and more !!! On Wednesday, April 10, 2019, 10:15:36 PM EDT, EMC.Guru wrote: Hi All, What would be the appropriate EMC standards for large

Re: [PSES] phishing e-mail from an old account of yours?

I got one, an extortion email, using an ancient ID and password from a Netscape account, how long ago?  Like AOL is secure ?  Don't they own the old Netscape?But the amazing aspect is that it came to my less than year old Corp email ID. My guess is that not only has some old database been

Re: [PSES] product marking detail for FCC marking

Most of our products have zero's in the ID, none with slashes, several decades of products. Outside of the USA, none care about the FCC ID, it is just filler for the label. And those that do, understand the American convention vs any others. ps. I am astounded that any lab outside of the USA

Re: [PSES] CEC NPRMs for lo-pwr mode and PF

The DOE provides the bark as the tail wags. From: Brian O'Connell To: EMC-PSTC@LISTSERV.IEEE.ORG Sent: Monday, September 18, 2017 8:19 PM Subject: [PSES] CEC NPRMs for lo-pwr mode and PF Industry and stake-holder responses to the California Energy

Re: [PSES] Dranetz Hardware

Sucks to be using "D**". Those devices have mis-represented the disturbances on the AC line for decades. Costing several Corps a few millions of dollars. The "D**" devices miss, cannot measure nor read, any of the real world AC line disturbances, that are disrupting today's technologies.

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

way, way, back in the day of CRT's, it was found that the office lighting was a bit off phase from the CRT's.  This lead to a very slight, but unaware annoying, difference in the in the office lighting and the CRT lighting, which caused the eyes to adjust to the change in lighting as the beat

Re: [PSES] USB dongle connector shield filtered grounding

Ancient EMC mythology, well proven to be wrong and so abandoned decades ago. And still it pops on occasion and often with new twists to revive the mythology.So it gets ignored as those new to the stories, such that they cannot figure it out, will need the lessons of 'on the job training'. ps.

Re: [PSES] FCC DTS Measurement Procedure - FCC KDB 558074 - Radiated Spurious Emission

You do have the FCC KDB article 558074 D01 DTS Meas Guidance v04  It is a mind bender of various methods... From: Grace Lin To: EMC-PSTC@LISTSERV.IEEE.ORG Sent: Wednesday, April 26, 2017 4:10 PM Subject: Re: [PSES] FCC DTS Measurement Procedure - FCC KDB 558074

Re: [PSES] FCC DTS Measurement Procedure - FCC KDB 558074 - Radiated Spurious Emission

That is far too simple for the guidance in the procedure. ps.  most SA's today can be made to do several types of average. If the TCB accepts it, you are good. From: Grace Lin To: EMC-PSTC@LISTSERV.IEEE.ORG Sent: Monday, April 24, 2017 8:25 PM Subject: [PSES] FCC

Re: [PSES] CORRECTION (wrong page) Passive Loop Emissions [General Use]

– Own Opinions Onlywww.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England   Sylvae in aeternum manent.  From: Bill Owsley [mailto:00f5a03f18eb-dmarc-requ...@ieee.org] Sent: Thursday, March 2, 2017 5:04 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] CORRECTION (wrong page) Passiv

Re: [PSES] CORRECTION (wrong page) Passive Loop Emissions [General Use]

"...since the 51.5 is derived from 20*log(377)" to be even more accurate, the 377 is the ratio of E/H, and for actual numbers (if I get this right) permittivity / permeability in a vacuum or free space or air since all are really close. We have recently acquired an E-field and H-field all in

Re: [PSES] outdoor EMC testing - questions

I had a larger EUT tested by an accredited lab in a large warehouse and the antenna was walked around to a bunch of points for the measurements.Before turning the EUT on, the ambients were recorded.  After turn on, the deltas were attributed to the EUT and measured. From: Ghery S.

Re: [PSES] [EXTERNAL] [PSES] AU CISPR 22 Class B Interpretation

To further add to the discussion, Subpart C of the  FCC part 15 deals with intentional radiators.  The limits there have no Class A or B differentiation, but do refer the limits specified as the general limits.   So a comparison between the limits in Subpart C and Subpart B (unintentional

Re: [PSES] Fwd: [PSES] Current probe for CM currents

If you can measure common mode noise on a cable, you have a problem from the port !! Note the world famous Ott's math on this effect in his 1st edition.  Might be in his 2nd too. I have used both e-field and h-field (current clamp) at the same time. We are engineers so figure out how I did

Re: [PSES] Current probe for CM currents

Ok, so call me lazy, real lazy ! clamp on your probe, measure a number, and then work to reduce that number by twice what is needed to meet the limit, then re-test. Repeat, if necessary. The really big trick in this process is knowing how to reduce the measured number of the problem that has

Re: [PSES] Generic EMC Precedence over Basic Standards and Fast Transient and Surge Immunity Questions

Most of the "front" text states that these are the minimum requirements to place a product on the market. If a product is designed to meet only the minimum requirements to be placed on the market ... Well, if the sales and volumes are not good, - due to minimal performance ...   loser ! Every

Re: [PSES] EN 55035/CISPR35

Korea generally requires in country testing, or testing by a limited number of approved labs out of the country. From: Bill Stumpf To: EMC-PSTC@LISTSERV.IEEE.ORG Sent: Monday, December 28, 2015 10:19 AM Subject: Re: [PSES] EN 55035/CISPR35 #yiv5514223977

Re: [PSES] PoE Injectors

Somewhere in the references at the end, you might find which devices that these standards apply to. There are number of exceptions.  And there may have been changes since doc was published.In the past I have emailed Victor with questions.- Bill From: Scott Douglas

Re: [PSES] USB and radiated emission issues

Have you determined that it is the stick and not the host?If the problem is just this brand of stick, then there are some layout issues that can be re-done to reduce or eliminate the issue.  As James mentions, if there is an imbalance in the differential signal, that will generate a radiated

Re: [PSES] USB and radiated emission issues

Digital company 5601 Great Oaks Pkwy San Jose, CA 95119-1003 ravinder.ajm...@hgst.com   From: Bill Owsley [mailto:00f5a03f18eb-dmarc-requ...@ieee.org] Sent: Friday, March 20, 2015 10:52 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] USB and radiated emission issues   Have you

Re: [PSES] Serrated head screws for grounding/bonding

way back, we moved from star washers, inside or outside teeth to serrated heads, and in all cases, the surfaces had to be masked from any painting or coating process, that was not part of the metal passivization.  Several vendors supplied parts painted with powder coat epoxy and no parts were

Re: [PSES] dielectric breakdown

So far... it seems that the impedance of the lab bench source drops the voltage below what will sustain the arc across the short circuit of the breakdown.  And so the waveform looks like a spark gap or lightning.  Lots of on and offs in quick succession.  ps. we had to use 'reinforced' fuses in

Re: [PSES] EMC test lab errors

Framed and posted in the lab ! From: Brian Oconnell oconne...@tamuracorp.com To: EMC-PSTC@LISTSERV.IEEE.ORG Sent: Tuesday, December 2, 2014 12:10 PM Subject: Re: [PSES] EMC test lab errors This is art; it shall be framed. Brian From: Ed Price [mailto:edpr...@cox.net] Sent:

Re: [PSES] Surface mount resistors failing short circuit

Yes sir they can fail to a short circuit.  And some do it gradually so you can watch it happen.We were amazed and watched it over and over, having never seen anything like it before.It started with brief pulses of over voltage in an AC application, No DC to continue the brief arc.  After the

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

For the FCC as noted in the post, special equipment, that is the stuff needed to pass the test, must be supplied with the equipment with instructions for using it. For example, the ferrites originally mentioned. In the EU, this has been held to be too complicated for the common consumer and

[PSES] on-site cal services

Thanks to all. We have several leads to follow. - Bill - 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 emc-p...@ieee.org All

[PSES] On-site calibration service

So while I know of some companies doing this, and have used a few as well,  Can anyone recommend an on-site calibration service?  I'm in south FL. Off line replies are welcome. Thanks, Bill - This message is from the IEEE Product

Re: [PSES] Foam table for EMC site

most any local building supply retailer can provide a several types of foam in all sorts of thicknesses.  Get a mechanical engineer to look at the supplies and design a table whatever foam he chooses. We used big blocks of 'Styrofoam'  and 2 inch thick sheets of packing foam cut to form an

Re: [PSES] [JunkMail] [PSES] Inexpensive RF generator

Only if it frequency sweeps down instead of or as well as the common up sweep. Intuitivily, one notices that this sweeps the fundamental freq as the leading signal and that the harmonics just follow along in the already swept regions. Any discovered problem will be due to the fudamental and not

Re: [PSES] Ferrite on LAN Cable

Was this response on the KDB, the Knowledge Data Base? If so, what is the number? That is where the FCC makes rulings on a near day to day bases. And those reasons are very similar to the ones given for the EU requirement. From: Bell, Chad chad_b...@bose.com

Re: [PSES] Spark Gap PCB Layout on AC Mains

Indeed... the protection scheme that passes Safety, causes the system to 'fail safe'  which does not meet the EMC immunity requirements. The previous 'remove the protection from the circuit for the hi-pot test' seem to have been removed. Now the IGBT's serve to cause the fuse to go open, which

Re: [PSES] Safety and Altitude and GDT

GDT internal spacing? not if a gas tight tube. External terminals for sure, but internal not, because the internal pressure does not go to altitude. It remains at the same pressure, unlike parts open to the environment. BUT, when an agency and their personnel are involved, there is no telling

Re: [PSES] Standalone EMC Chamber?

Make a building far larger than a 10 meter OATS.  Then inside the walls of that building add layer upon layer of cones and tiles until you get well over 60 dB of attenuation of ambient signals. The reciprocal applies. The common and likely cheaper chambers of today, make a Faraday shield and

Re: [PSES] Standalone EMC Chamber?

Make a building far larger than a 10 meter OATS.  Then inside the walls of that building add layer upon layer of cones and tiles until you get well over 60 dB of attenuation of ambient signals. The reciprocal applies. The common and likely cheaper chambers of today, make a Faraday shield and

Re: [PSES] Standalone EMC Chamber?

The big three auto makers have some chambers ! Stand alone ? Too big to tell from where I was. But given the materials needed and the construction techniques... A stand-alone would be a covered OATS. For the normal shielded chambers, an environmental building would need to surround it for

Re: [PSES] EMC Required?

For the USA, any electrical signal above 9 kHz meets the requirement to be tested. I think we will find similar for the EU.   EN 300 330, or 300 440, or something like that. It has power and a switch and generates frequencies above the lower limit - it gets tested. ps. that means the device will

Re: [PSES] Conductive plastic

you have anticipated the answers and elimintated them in your details, then finished with the conclusion. plastics have a nasty mechanical 'skin effect' that requires in all cases I've chased, a mechanical process to remove the 'skin' and expose the conductivity.  Even tried some experiments at

[PSES] looking for ...

electrically conductive and thermally insulative material to use as a gasket. Yah, I know... I can't write that with a straight face !!! - Bill - This message is from the IEEE Product Safety Engineering Society emc-pstc

Re: [PSES] looking for ...

.yahoo.com, dated Tue, 11 Jun 2013, Bill Owsley wdows...@yahoo.com writes: electrically conductive and thermally insulative material to use as a gasket. Yah, I know... I can't write that with a straight face !!! It may not be impossible. See, for example: http://phys.org/news/2011-07-bristol-physicists

Re: [PSES] Single Point Grounding - Not Achievable at High Frequencies (greater than a few MHz)

, to single ground set of chassis, and then stepped up the CBN, common bonding network of a single ground room.  Now to go see everyone else says! From: ce-test, qualified testing bv - Gert Gremmen g.grem...@cetest.nl To: Bill Owsley wdows...@yahoo.com; d

Re: [PSES] Single Point Grounding - Not Achievable at High Frequencies (greater than a few MHz)

, 2013 3:35 AM Subject: Re: Single Point Grounding - Not Achievable at High Frequencies (greater than a few MHz) In message 1369105334.30674.yahoomail...@web160401.mail.bf1.yahoo.com, dated Mon, 20 May 2013, Bill Owsley wdows...@yahoo.com writes: Dr. Tom Van Doren demonstrates that single point

Re: [PSES] safety 60950 and surge suppression circuits

a blast shield but the damn pieces bouncing off the walls and ceiling still got to me! From: Aldous, Scott scott.ald...@aei.com To: Joe Randolph j...@randolph-telecom.com; ri...@ieee.org ri...@ieee.org Cc: Bill Owsley wdows...@yahoo.com; EMC-PSTC

Re: [PSES] Capacitor Discharge Test IEC 61010-1

A few decades ago when an intern, called co-op back then, a customer complaint came in that they had been shocked by the power plug after pulling it from the wall.  No way said the engineers!  Hey co-op go test this.  We  it turns out there can be the peak voltage left on the pins of

Re: [PSES] Single Point Grounding - Not Achievable at High Frequencies (greater than a few MHz)

Dr. Tom Van Doren demonstrates that single point grounding is not possible above the audio frequencies.  Thus the lower cutoff in the regulations of 9 kHz.  And that is really old school... From: Doug Smith d...@emcesd.com To: Si-List

[PSES] safety 60950 and surge suppression circuits

I'm running into a dilemma.   Not being a Safety Engineer myself, but rubbing elbows with them... On a piece of ITE equipment, I need some surge suppression for worldwide markets with one annoying requirement for 4 kV, otherwise just 2 kV line to earth, and using either plugable cords or

Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

From: Bill Owsley wdows...@yahoo.com Reply-To: Bill Owsley wdows...@yahoo.com Date: Sun, 28 Apr 2013 19:22:49 -0700 (PDT) To: Ken Javor ken.ja...@emccompliance.com, EMC-PSTC@LISTSERV.IEEE.ORG EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: Mode-stirred, Mode-tuned, Reverb

Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

The large size you mention rings a faint bell of memory... There was some caution about using a chamber at frequencies above its first resonance which is based on size. The peaks and nulls of the multi-modal chamber then skew the reverb pattern along those peaks and nulls. Do I remember

Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

Way back once upon a time, we had tested a shielded chamber, that needed, according to the spec's, a SE higher than some number like you mention.   Our initial testing revealed a few weak points.  The several re-designs fixed those, but the purchase spec for the interface panel to the outside

Re: [PSES] ITE and POE

I suspect that there is a little bit more to Safety testing than just the electricity. Using SELV to brush off all Safety evaluations might be taking a risk. From: John Woodgate j...@jmwa.demon.co.uk To: EMC-PSTC@LISTSERV.IEEE.ORG Sent: Monday, April 29,

Re: [PSES] Mode-stirred, Mode-tuned, Reverb - what's the difference?

The debate amongst the proponents that I heard concerned the concept or idea of matching, or not , test program cycle time with paddle cycle time.  The tuned folks argued that the paddle should stop at each step for a program cycle time, then there was the debate over how big is each step.  At

Re: [PSES] Intensity of ESD for skin and hand-metal discharges

I know of personal testimony that the discharge from my pointed finger is much more intense than the doorknob. If you wear the right combination of materials and shoes and carpet and weather when approaching someone working on earthed machines,  the two inch spark will cause them to

Re: [PSES] Control over handheld radio and similar low-power transmitter harmonic and spurious power output, USA

5 watts is licensed.  1 watt and less is unlicensed - maybe. handheld voice communication is limited, a lot, In general, spurious cannot be any higher than intentional. As long as both are below 15.209. Note peak limits too! and the restrictied bands of 15.205? which incudes harmonics - in my

Re: [PSES] FCC Part 5 Experimental Services

A couple of references...  I get news from all over the place and may have mixed a couple of items. http://www.incompliancemag.com/index.php?option=com_contentview=articleid=1490:fcc-proposes-changes-to-equipment-approval-process-catid=1:latest-newsItemid=19

  1   2   3   >