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

Hi Piotr, Just to add to the debate: “I know that if circuit is not going out of building it is considered being without transients” If a cable is longer than 30m then most product EMC standards will call up a requirement for line-to-earth surge testing. Some do make it explicit that

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

I once tried to do a “worst case” analysis and decided that worst would be testing the HDMI output on the product we had designed at the highest resolution = highest frequency = biggest problem. I ran all our pre-compliance work at this frequency and neglected to check any other resolutions.

Re: [PSES] EN 61000-6-2 Surge

Hi Amund, This might help https://www.unit3compliance.co.uk/what-is-a-dc-power-port-emc-explained/ All the best James James Pawson Managing Director & EMC Problem Solver Unit 3 Compliance Ltd EMC : Environmental & Vibration : Electrical Safety : CE & UKCA : Consultancy

[PSES] Y-capacitor body material - considered to be insulating?

Hello Group, We are assessing a system that uses class Y1 capacitors for EMC filtering. Because of space constraints, they are laid down horizontally on the PCB. This is causing a problem (at least in my mind) where the capacitor body is now resting on top of the AC input trace. The side

Re: [PSES] 61010-1 hazardous live classification

o.uk or call 01274 911747. Our lead times for testing and consultancy are typically 4-5 weeks. From: James Pawson (U3C) Sent: Monday, February 26, 2024 1:38 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] 61010-1 hazardous live classification Hello all, I hope this safety q

Re: [PSES] Conducted Immunity test for EMC

Hi Kim, This looks like distance between injection point and EUT. This diagram is for direct injection through a resistor with no CDN. The resistor forms the ‘C’ or coupling part of the CDN, and the “decoupling device” forms the ‘D’ of decoupling part. All the best James James

Re: [PSES] SV: [PSES] Wire insulation - Flammability - IEC/EN 62368-1

seconds). Right? BR Amund Fra: James Pawson (U3C) Sendt: 24. oktober 2023 10:41 Til: <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> EMC-PSTC@LISTSERV.IEEE.ORG Emne: Re: [PSES] Wire insulation - Flammability - IEC/EN 62368-1 Hi Amund, This is my understanding. Level 1 energy sources =

Re: [PSES] AI & Regulatory Compliance

Hi Doug, Thanks for the useful links. FYI the link for Elicit should be https://elicit.com/ - the “elecit dot org” gave my antivirus webshield some conniptions. All the best James James Pawson Managing Director & EMC Problem Solver Unit 3 Compliance Ltd EMC : Environmental

Re: [PSES] Wire insulation - Flammability - IEC/EN 62368-1

Hi Amund, This is my understanding. Level 1 energy sources = no safeguards required. I would always be prepared to review after single fault testing. We've never managed flames with a PS1 source but have melted cable insulation and battery holders. All the best James James Pawson

Re: [PSES] IEC/EN62368-1 includes requirements (Annex M) to IEC/EN 62133-2

Hi Amund, Annex M (batteries) is normative = shall comply. You only get to comply with Annex M if you pass M.2.1 which requires that cells comply with the relevant IEC standard. IEC 62133 (all parts) are in Annex ZA as an undated reference meaning you should be looking to use the latest one -

Re: [PSES] EN 62368-1:2020 - MOVs - contradiction?

es for testing and consultancy are typically 4-5 weeks. From: Dürrer Bernd Sent: Tuesday, September 26, 2023 8:59 AM To: James Pawson (U3C) ; EMC-PSTC@LISTSERV.IEEE.ORG Subject: AW: [PSES] EN 62368-1:2020 - MOVs - contradiction? Hello James, depending on the product safety standar

Re: [PSES] EN 62368-1:2020 - MOVs - contradiction?

ailto:he...@unit3compliance.co.uk> he...@unit3compliance.co.uk or call 01274 911747. Our lead times for testing and consultancy are typically 4-5 weeks. From: Joe Randolph Sent: Monday, September 25, 2023 5:58 PM To: 'James Pawson (U3C)' ; EMC-PSTC@LISTSERV.IEEE.ORG Su

Re: [PSES] EN 62368-1:2020 - MOVs - contradiction?

s an email on <mailto:he...@unit3compliance.co.uk> he...@unit3compliance.co.uk or call 01274 911747. Our lead times for testing and consultancy are typically 4-5 weeks. From: Joe Randolph Sent: Friday, September 22, 2023 7:47 PM To: 'James Pawson (U3C)' ; EMC-PSTC@LISTSERV.IEEE.ORG Subje

Re: [PSES] EN 62368-1:2020 - MOVs - contradiction?

edle flame (there are plenty more tests in the MOV standards that are NOT called up) Essentially: Comply with IEC standards or do the relevant tests from the IEC standards All the best James From: James Pawson (U3C) Sent: Friday, September 22, 2023 9:30 AM To

[PSES] EN 62368-1:2020 - MOVs - contradiction?

Hello all, Not sure if this is an amusing contradiction or I'm missing something? See green highlight below. All the best James EN 62368-1:2020 5.5.7 SPDs Where a varistor is used between a mains circuit at ES3 voltage and protective earthing: - the earth connection shall

[PSES] -- Laboratory Scheduling Software Options

Hello folks, We are hitting the limits of our calendar system in terms of being able to easily allocate resources (both human and test facility) efficiently. The problem mostly manifests in terms of "who is using resource x at the moment? Can we fit this other work in?" We want to be able

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

Hi Brian, In IEC 61000-4-3 the level is defined as the unmodulated rms field strength. The modulation (1kHz 80% AM) is applied symmetrically around that level. >From memory this means that the peak is 5.1dB higher than the level. The opposite is true in ISO 11452-2 for automotive where the

Re: [PSES] Simulation of signal source under a pwb shield

Hi Charles, Why not flip it around? The circuit under your shield is an antenna which will be as good at receiving as transmitting. Illuminate the circuit with a known field intensity (radiated RF immunity test IEC 61000-4-3 for example) and measure the noise voltage at the key point on the

Re: [PSES] EN/IEC 61010-1 insulation question

Thanks Richard! Richard Nute wrote > > >Hi James: > > > >My answers to your questions: > > > >1. Does 6.7.3 apply for the clearance between the secondary winding and >earth as indicated? > >Yes. > >2. If NO to 1) then what parts should this insulation be between? >3.

Re: [PSES] EN/IEC 61010-1 insulation question

00h to 1730h from Monday to Friday. For inquiries, bookings, and testing updates please send us an email on <mailto:he...@unit3compliance.co.uk> he...@unit3compliance.co.uk or call 01274 911747. Our lead times for testing and consultancy are typically 4-5 weeks. From: James Pawson (

Re: [PSES] 62368 Battery question

Sent from my T-Mobile 5G Device Original message ---- From: "James Pawson (U3C)" mailto:ja...@unit3compliance.co.uk> > Date: 4/24/23 3:10 AM (GMT-05:00) To: EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSE

Re: [PSES] ESD standards for testing remotes

Hi Charles, I thought you were Mr. RF these days and didn't stoop to lowly EMC tests ;-) Agree with Charlie on EN 55035 - - > IEC 61000-4-2 @ 8kV air and 4kV contact. Removing the built up charge from the insulated surface will be the challenge during testing. All the best James

Re: [PSES] 62368 Battery question

The standard requires that the battery charging circuit must terminate the charge if the temperature of the cell (measured as per the cell manufacturer’s instructions, usually a thermocouple on the negative terminal IIRC) exceeds the manufacturers specifications. If the cells are in a

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

class I constructions. However, as defined in the second paragraph of clause 22.35, stationary appliances are exempt if their handles are reliably earthed. Kind regards, Bernd Von: James Pawson (U3C) < <mailto:ja...@unit3compliance.co.uk> ja...@unit3compliance.co.uk> Gesende

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] 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.

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] Adding more than one EUT

Hi Derek, Is the daisy chain connection the AC supply or some other power bus? How is 8 units daisy chained any different to 8 separate units all on the same power bus? We are looking for individual emission contributions from each connected unit. If measuring conducted emissions on a desktop

Re: [PSES] Electrical Safety - Fundamental Standards and Concepts

47 | +44(0)7811 139957 2 Wellington Business Park, New Lane, Bradford, BD4 8AL Registered in England and Wales # 10574298 From: Richard Nute Sent: 08 December 2022 01:17 To: 'James Pawson (U3C)' ; EMC-PSTC@LISTSERV.IEEE.ORG Subject: RE: [PSES] Electrical Safety - Fundamenta

[PSES] Electrical Safety - Fundamental Standards and Concepts

Hello experts, My goal is to put together a reading and reference list of fundamental standards that help me understand the basic physics and rationale behind the requirements in safety standards (mainly EN 62368-1, EN 61010-1, EN 60335-1). I've been finding a lot of useful references from

Re: [PSES] SV: [PSES] UKCA marking replaces the CE on 01/01/2023

Hi Amund, The legislation used instead of the CE marking directives is almost identical to the EU Directives (pre-brexit we ‘nationalised’ EU directives like the EMC Directive), but with some post-brexit wording changes e.g. Notified Body --> Approved Body Harmonised Standards -->

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

Hello Rich, Thanks for sharing this document, very interesting reading as always. All the best James James Pawson Managing Director & EMC Problem Solver Office hours: My mornings are reserved for full attention on consultancy, testing, and troubleshooting activities for our

Re: [PSES] To NRTL or not NRTL, that is the question

, BD4 8AL Registered in England and Wales # 10574298 From: James Pawson (U3C) Sent: 27 September 2022 08:20 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] To NRTL or not NRTL, that is the question Hello experts, I'm trying to understand what electrical products require NRTL approval for

[PSES] To NRTL or not NRTL, that is the question

Hello experts, I'm trying to understand what electrical products require NRTL approval for electrical safety for sale in the United States. Looking on the OSHA website I find this page (https://www.osha.gov/nationally-recognized-testing-laboratory-program/products-requiring-approval) which

Re: [PSES] IEC/EN 62368-1 Test report template

e before on this forum – but I think it was worth repeating! AFrom: James Pawson (U3C) mailto:ja...@unit3compliance.co.uk> > to To: emc-p...@listsetrirv.ieee.org <mailto:emc-p...@listsetrirv.ieee.org> Subject: Re: [PSES] IEC/EN 62368-1 Test report template Hi Amund, If you have t

Re: [PSES] IEC/EN 62368-1 Test report template

Hi Amund, If you have the money you can buy these from the IEC - https://webstore.iec.ch/publication/68495 - but they aren’t cheap (cue the Yorkshire War Cry of “ ‘ow much? ”) If you have the time, you can search for “EN 62368-1:2014 test report”, see the format, and copy/paste/mess

Re: [PSES] Zuken

Quadra here in the UK should be able help but you may have to buy some hours https://www.quadrasol.co.uk/ Lfresearch wrote >Hi folks, I’ve been asked a few questions on Zuken that I’m not sure how to >answer. Anyone familiar with the package? In particular the design rules

[PSES] Transmission line termination impedance -- SI problem yes, EMC problem no?

(I posted this in LinkedIn as well but thought I'd float this in front of you learned folks) Transmission line impedance and termination is important for: * Signal integrity = yes * EMC emissions = no (???) Here's my current line of thought: (1) EM Radiation from a transmission line

Re: [PSES] Removable door panel grounding

Hi Frank, Could you use a spring clip like this in series with the earthing conductor to permit easy disconnection and reconnection? https://www.wago.com/gb/installation-terminal-blocks-and-connectors/compact-splicing-connector/p/221-412

Re: [PSES] COBOT Consultant

No affiliation, but I've chatted with Matt a few times before now. I know this is his specialist field. He is based in the UK. * m...@cobotsmachinerysafety.co.uk * website * LinkedIn

Re: [PSES] Dual antenna during RE test ?

Hi Ken, all, The conversation about log spiral antennas has got me thinking and searching. Apart from the Emco / ETS 3100 series, are there any other antennas covering the 200MHz to 1GHz band that one could consider? Has anyone seen log spiral antennas that work down below 80MHz (I

Re: [PSES] Chasing a specific frequency

Hi Amund, Narrowband or broadband noise? If broadband and you zoom in to the noise on the analyser, is it made up of separate peaks? What is the spacing between the peaks? Try using a near field probe to zoom in on the emissions -

[PSES] Origin of steps in radiated emissions limit lines

Hello all, A question I get asked by our customers, and that I've not found a satisfactory answer to, is why are there steps in the limit lines for radiated emissions? This kind of leads to the question of how do limit lines get specified in the first place? For emissions and immunity.

[PSES] Earthing -- Star vs Spring/Split Washers

Hello all, I've given myself a regular internet headache trying to understand the relative merits of spring vs star washers for use on an earth stud for protective earthing purposes. What is the conventional wisdom and justification? I know I can trust you folks to be above a simple "we've

Re: [PSES] US vehicle EMC regulations

From: Bill Owsley Sent: 20 December 2021 03:48 To: emc-pstc@listserv.ieee.org; James Pawson (U3C) Subject: Re: [PSES] US vehicle EMC regulations A list of the mostly known standards ! Thanks to Todd Hubing ! LearnEMC - List of Automotive Electromagnetic Compatibility Test Standards &

Re: [PSES] US vehicle EMC regulations

YlN1dz5QXjId9bpa0keWzfVxhl8KPj78uD6-S6nfqRsg=e49e0dc0-96a3-2516-27fa-ee2e8c42b177> <https://twitter.com/ElementTesting/> <https://elementmaterials.eu.qualtrics.com/jfe/form/SV_3xQqm84s6IydI5D> From: James Pawson (U3C) [mailto:ja...@unit3compliance.co.uk] Sent: Friday, December 17, 2

[PSES] US vehicle EMC regulations

Hi all, I'm familiar with UNECE Regulation 10 that covers EMC for vehicles and Electronic Sub Assemblies in Europe. Is there an equivalent set of vehicle EMC standards for the US? Presumably CFR47 Part 15 applies to unintentional and intentional radiators as well? Thanks and all

Re: [PSES] unusual conducted emissions question

Hi Doug, Thinking aloud here: This strikes me as more of a flicker/inrush current kind of problem, whereas conducted emissions would be more of a steady state problem. In the AC mains flicker test it's a "stiff" supply and a series impedance over which to measure the inrush current. In

Re: [PSES] Safety Compliance Testing: It's A Business, So Shop Around

Hello John, These are excellent points. I was going to say that I've not come across this attitude with many of my customers but then the question popped into my head of "how do I know that for sure?" What questions would you typically ask of your clients to understand their attitude to

Re: [PSES] Surges on Ethernet ports under 62368-1

Hi Peter, It would align with the guidance in IEC 61000-4-5 for applying surges to 'long distance lines and outdoor lines' which would include Ethernet leaving a building. The built in voltage isolation of the Ethernet magnetics handles 1kV surges just fine. Main risk is a poorly implemented

[PSES] Product for detecting missing earth connection

Hello experts, Does anyone know of an off-the-shelf product for detecting the presence of an Earth connection on an incoming AC supply? There are plenty of ways of detecting earth fault currents like RCDs and GFCIs but I seem to be hitting a block finding something that explicitly monitors

[PSES] Overvoltage Categories (OVC) and "Reliable" Earthing - 62368-1 vs 60601-1

Hello safety experts, A question regarding overvoltage categories and "reliable" earthing and some differences between standards. I would be interested to hear your thoughts. Background: When determining the required withstand voltage for insulation, EN 62368-1 states that: 5.4.2.3.3

Re: [PSES] What percentage of products pass first time?

(replying even though I’m not a guru) Hi Charles, hope all is well with you Speaking from my own experience. Over the last four years of running a consultancy, pre-compliance and low cost test EMC laboratory I would (very roughly) estimate that around: * 50% of products pass their

[PSES] Safety Question :: Isolation requirements for AC supply: phase-phase and phase-neutral

Hi all, Currently helping a customer with a 3-phase power monitoring product to get their electrical safety in order. I understand the requirements for safety isolation from hazardous live/ES3 to user accessible terminals/ES1 based on the possible mains transient voltage of up to 2500Vpk (OVC

Re: [PSES] ISO 7637-3 (automotive)

-materials-technology?challengeId=AQFf9AemZ4SobwAAAXOQwivOsnkHiTt2ByoCkOxVQjOGOjRlivicVgYlN1dz5QXjId9bpa0keWzfVxhl8KPj78uD6-S6nfqRsg=e49e0dc0-96a3-2516-27fa-ee2e8c42b177> <https://twitter.com/ElementTesting/> <https://elementmaterials.eu.qualtrics.com/jfe/form/SV_3xQqm84s6

Re: [PSES] ISO 7637-3 (automotive)

February 2021 14:48 To: James Pawson (U3C) Cc: EMC-PSTC@listserv.ieee.org Subject: Re: [PSES] ISO 7637-3 (automotive) We created the document specific to the transportation industry so predominantly automotive but I am also aware of agriculture, truck & bus, and even avionics/aeros

[PSES] ISO 7637-3 (automotive)

Hello experts, Does anyone know what standards call up or mandate the use of the automotive standard ISO 7637-3 (coupling of noise onto non-supply lines)? There is nothing in R10.06 or ISO 7637-2 that I can see. Thanks in advance James James Pawson Unit 3 Compliance Ltd

Re: [PSES] Automotive EMC training

On the subject of Kens – in the Scottish dialect, to “ken” is to understand or know something as in “oh aye I ken tha’ EMC problem” So congratulations to all Kens, you are one step ahead of the rest of us. All the best Ken…Sorry… I mean James. James Pawson The EMC

Re: [PSES] AW: [PSES] EN 61000-6-2:2019 - Missing Annex ZZ?

bably take considerable time until a new definition has been agreed upon, TC 210 decided to publish the standards without Annex ZZ to make them available. Kind regards, Bernd Von: James Pawson (U3C) < <mailto:ja...@unit3compliance.co.uk> ja...@unit3compliance.co.uk> Gesendet: Freit

[PSES] EN 61000-6-2:2019 - Missing Annex ZZ?

Hello EMC-ers, happy new year to everyone. I've just been looking at the redline version of EN IEC 61000-6-2 (Industrial Immunity) from 2006 to 2019 versions. It appears that the Annex ZZ (that links the standard to the Essential Requirements of the EMC Directive) is missing on the new

Re: [PSES] Keytek EMC Pro direct surge output question

Hi Bob, I know my KeyTek ECAT does have the 18uF. Not sure if that helps much though. James James Pawson The EMC Problem Solver Unit 3 Compliance Ltd EMC Testing / Design for EMC / Problem Solving / Pre Compliance / Consultancy / Environmental & Vibration

Re: [PSES] SV: [PSES] Thoughts on what may be the emission source

Derek, I agree with Amund. Narrowband 240MHz (high speed mode clock rate) and 480MHz (second harmonics from low differential pair matching) are classic USB emissions. There may be a little something at 960MHz of 1.44GHz as well. I've had good results from RasPi boards in the past with USB so

Re: [PSES] In-house Conducted emission test equipment

Hi Amund, You might want to look at the Narda 9010F receivers https://www.narda-sts.it/eng/products/receivers/9010f/ I've heard good things about them and the scan speed with the FFT technology would be most valuable for pre-compliance! They also make LISNs. All the best James James Pawson

Re: [PSES] "Singing probe"

Hello Rick, Thinking aloud: Could it be magnetostriction of the core and windings? Perhaps this could be exacerbated by a probe with some foreign material in the gap? All the best James Rick Goodwin wrote >Hello, > >A question for the experts. While doing an automotive BCI test,

Re: [PSES] integrated or non-user serviceable Li-ion batteries

Hello Chester, You might want to check out Annex M of 62368-1 which has some guidance on secondary lithium batteries. I'm helping a customer with their evaluation at the moment. We've found conflicting info from the battery manufacturer and incomplete testing from the previous safety test

Re: [PSES] EMC testing for IVD equipment

This is consistent with a customer of mine making a device for stroke patient rehab in a clinic setting. They've been told that 60601-1-2 is required. Will ask them where this requirement came from. All the best James James Pawson The EMC Problem Solver Unit 3 Compliance Ltd

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

Hi Charles! I'm just a simple lad from Yorkshire meaning I usually need things explaining to me with lots of pictures (sometimes in crayon) and words of less than one syllable. As such, I'm about to mangle some terminology I'm sure. Any wave travelling through space is going to interact

Re: [PSES] EMC/E-Mark conformity tests

Hi Scott, “The noise source should come from the unit plugged in, very low noise from the charger itself." That depends on if the charger is using a DC/DC converter in which case this may not be true! ;) James James Pawson EMC Problem Solver Unit 3 Compliance Ltd EMC

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

Adam, I’ve been having success with these HDMI cables. Not dissected one yet but they seem to be pretty good from a radiated emissions point of view. You’ll have to check if they are available in the USA. https://www.amazon.co.uk/dp/B01K1X1QV2/ref=pe_3187911_189395841_TE_dp_1 No

Re: [PSES] Stripline - discontinuity in adjacent ground planes

Hi Amund, Are the distances from GND1-Signal the same as Signal-GND2 i.e. is the Signal layer equidistant between the two GND layers? If so, broadly speaking, half of the field is going to be between GND1 and signal and the other half will be between GND2 and signal. If the signal layer

Re: [PSES] SV: [PSES] Ground copper fill on signal layer on multilayer PCB

Hi Amund, If you have the space on the board then a ground fill around the perimeter (on all layers) probably won’t do any harm. Whatever ground fill strategy you decide on for the signal layer I would make sure it is well connected with vias to both of the adjacent planes along the edge

Re: [PSES] [EXTERNAL] Re: [PSES] Mandatory certification

Hello Peter, For the EMC/EMI side of things, I believe the table in CFR 47 15.101 is the key. The Suppliers Declaration of Conformity (SDoC) path means no formal certification is required.

Re: [PSES] CISPR 25 Limits for conducted disturbances - guidance for selecting emissions class

/ Consultancy / Environmental & Vibration www.unit3compliance.co.uk <http://www.unit3compliance.co.uk/> -- 07811 139957 Opening Hours: Tuesday to Friday, 0830 to 1800. Closed Monday. From: Matthew Wilson | GBE Sent: 07 February 2020 21:24 To: James Pawson (U3C) ; EMC-PSTC@LISTSERV.IEEE.O

[PSES] CISPR 25 Limits for conducted disturbances - guidance for selecting emissions class

Hello experts, Can anyone point me towards any guidance for selecting the appropriate CISPR 25 emissions Class (1-5) based on installation of equipment within a vehicle? The standard states "The level class to be used (as a function of the frequency band) shall be agreed upon between the

Re: [PSES] GTEM cell used for RE measurement

lways ends in 'a'. Write 100 times. ;-) Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk <http://www.woodjohn.uk> Rayleigh, Essex UK On 2019-08-13 07:47, James Pawson (U3C) wrote: Thinking aloud here: would such a factor exist as a generic formula?

Re: [PSES] GTEM cell used for RE measurement

Hello Ken, Thinking aloud here: would such a factor exist as a generic formula? If I think about this the other way round, putting 1V of RF into the coax connector will generate 1V between the septum and ground (or between the septums? septii? in the case of a differential GTEM like a

[PSES] Cable Arrangement and Separation in EN 61000-4-3 Radiated Immunity Test

Hello experts, I am performing some testing on a control panel with multiple cable connections and it has got me thinking about the radiated RF immunity testing. I know from the EN 61000-4-3 standard that "1m of cable is exposed to the electromagnetic field" in the Uniform Field Area (UFA).

Re: [PSES] Railway Earthing and Isolation Requirements - Rolling Stock and Trackside Equipment

& Vibration <http://www.unit3compliance.co.uk/> www.unit3compliance.co.uk -- 07811 139957 Opening Hours: Tuesday to Friday, 0830 to 1800. Closed Monday. From: James Pawson (U3C) Sent: 19 July 2019 09:40 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Railway Earthing and Isolation Re

Re: [PSES] Railway Earthing and Isolation Requirements - Rolling Stock and Trackside Equipment

you looked at IEC TC9 publications? Go to: https://www.iec.ch/dyn/www/f?p=103:22:0FSP_ORG_ID:1248 Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk <http://www.woodjohn.uk> Rayleigh, Essex UK On 2019-07-19 09:40, James Pawson (U3C) wrote

[PSES] Railway Earthing and Isolation Requirements - Rolling Stock and Trackside Equipment

Hello experts, I'm working with a company designing some equipment for both rolling stock and trackside applications for rail applications. Information about earthing schemes for this type of equipment seems to be ill defined. The customer has been given the (vague) requirement that they

Re: [PSES] DC/DC EMI Input Filter Stability

nt: 04 June 2019 17:53 To: James Pawson (U3C) ; EMC-PSTC@LISTSERV.IEEE.ORG Subject: RE: [PSES] DC/DC EMI Input Filter Stability Typically we handle each DC to DC as separate entities and filter locally. Having said that - are you trying to solve and EMI problem or trying to prevent

Re: [PSES] DC/DC EMI Input Filter Stability

http://www.electrical-integrity.com/Paper_download_files/DC17_PAPER_11_Overv iewComparisonPowerConverterStability_Hartman.pdf Regards, Istvan Novak Samtec On 6/4/2019 3:45 AM, James Pawson (U3C) wrote: Morning all, ? I?m designing an EMI filter for a DC input power line that has four DC/DC

[PSES] DC/DC EMI Input Filter Stability

Morning all, I'm designing an EMI filter for a DC input power line that has four DC/DC converters all running off it. I know that the output impedance of the EMI filter needs to be much lower than the input impedance of the DC/DC converter to prevent oscillation/instability. But what

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

Hi John, Something you wrote earlier has puzzled me a little. I’ve summarised the thread below, hopefully retaining the original context JMW: I doubt anyone would disagree with that. But if a company allows a test house to impose compliance, how can it know that the result is reliable?

Re: [PSES] Exemptions from UK Plugs and Sockets Regulations

Hi Charlie, Not my speciality, but doesn't the requirement in EN 62368-1 require compliance with BS 1363? 4.7 Equipment for direct insertion into mains socket-outlets . 4.7.2 Requirements The mains plug part shall comply with the relevant standard for the mains plug. I'm not sure if

Re: [PSES] Testing a product with that uses a solar panel

Hi Charles, hope you are well In a previous job we used a xenon arc searchlight, originally intended for naval use, for making solar heat loading measurements on outdoor high brightness LCD monitors. This was roughly calibrated with temperature measurements on a matt black metal plate the same

Re: [PSES] New EU enforcement regulations touches on all? product regulations/directives.

I've had a couple of inquiries recently from potential customers who have said "we want to sell this on Amazon but they are asking for an EMC report?" so maybe Amazon are (finally) starting to ask the right questions. I've seen non-EMC-compliant but CE marked power supplies sourced from Amazon

Re: [PSES] World Weather

Slightly OT but I find http://windy.com absolutely fascinating viewing! All the best James From: Charlie Blackham Sent: 15 January 2019 19:38 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] World Weather Doug ETSI publish a number of standards with environmental conditions and

Re: [PSES] MIL-STD-461 and power cables sanity check

, the dc power would be subjected to the wording you cited, but the ac power would not. Ken Javor Phone: (256) 650-5261 _ From: "James Pawson (U3C)" mailto:ja...@unit3compliance.co.uk> > Reply-To: "James Pawson (U3C)" mailto:ja...@unit3compliance.co.uk> >

[PSES] MIL-STD-461 and power cables sanity check

Hello all, MIL-STD-461 has a requirement for any conductors in a cable assembly carrying "primary power" i.e. AC power from a vessel distribution bus to be separated out from the main cable bunch and routed separately in a test setup (clause 4.3.8.6). It also states that the primary power

Re: [PSES] Cable Flammability Standard Comparison

Hello folks, Thank you to everyone who replied with the information and further reading; it was most helpful. I'm still on the EN version of the 2nd edition which is why I hadn't spotted the update. All the best James From: James Pawson (U3C) Sent: 07 January 2019 15:55 To: EMC

[PSES] Cable Flammability Standard Comparison

Hello all, Happy new year folks, I hope 2019 brings health and happiness to you all. I'm trying to gain a better understanding of cable flammability standards. Safety standard EN 62368-1 states that, for PS2 and PS3 circuits, wire insulation flammability should meet the requirements of

Re: [PSES] Radiated RF Immunity vs. Radio Module

antenna and it's fine at 3V/m immunity. With an additional SAW filter in line with the antenna feed it passes at 10V/m. I really appreciate the assistance, having a community of people to bounce ideas off is invaluable for lone workers like me. Cheers. James From: James Pawson (U3C

Re: [PSES] Radiated RF Immunity vs. Radio Module

ts.com Main:510-578-3500 Fax:510-440-9525 From: James Pawson (U3C) [mailto:ja...@unit3compliance.co.uk] Sent: Tuesday, November 27, 2018 6:03 AM To: EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: [PSES] Radiated RF Immunity vs. Radio Module Hello, I have

Re: [PSES] Radiated RF Immunity vs. Radio Module

performance. Ken Javor Phone: (256) 650-5261 _ From: "James Pawson (U3C)" mailto:ja...@unit3compliance.co.uk> > Reply-To: "James Pawson (U3C)" mailto:ja...@unit3compliance.co.uk> > Date: Tue, 27 Nov 2018 14:02:57 - To: mailto:EMC-PSTC@LISTSERV.IEEE.OR

[PSES] Radiated RF Immunity vs. Radio Module

Hello, I have a puzzling query today. I'm testing a product with an integrated radio module for 868MHz Zigbee. The EUT has an internal antenna connected to the UFL connector of the module. This means the wanted signal is provided by an antenna inside the test environment. The standard

Re: [PSES] 62368-1 - Resistive PIS Question

James From: John Woodgate Sent: 15 November 2018 19:07 To: James Pawson (U3C) ; EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] 62368-1 - Resistive PIS Question There is no such thing as 'RMS power'. The product of RMS voltage and current which are in phase is average power. In IEC standards

[PSES] 62368-1 - Resistive PIS Question

Hi folks, I seem to be more take than give at the moment, my apologies. IEC/EN 62368-1 classifies ignition hazards as a Potential Ignition Source (PIS) A resistive PIS is any part in a PS2 or PS3 circuit that: - dissipates more than 15 W measured after 30 s of normal operation; OR

Re: [PSES] Low Frequency Spectrum Analyser for RE101

Hello all, Thank you very much for all the helpful replies. I managed to get a good deal on a hired spectrum analyser. Whilst this is a one off test I'll keep my eye on eBay to see if one comes up. All the best James From: James Pawson (U3C) Sent: 14 November 2018 08:34 To: EMC

[PSES] Low Frequency Spectrum Analyser for RE101

Hello all, I'm helping a customer out with some MIL-STD-461 pre-compliance but am struggling to find a spectrum analyser or receiver for the RE101 test - 30Hz to 100kHz, RBW 10Hz and 100Hz. All my spectrum analysers stop at 9kHz. I'd prefer to avoid having to pay top whack for a posh R

  1   2   >