Re: [PSES] LISN Calibration Measurement Uncertainty

No criticism of how a LISN is calibrated. That wasn't the point. The point was that LISN impedance uncertainty affects the measurement of conducted emissions differently by mode, so that the overall uncertainty of the measurement of CE is different from that of the LISN impedance. Also, while the

Re: [PSES] LISN Calibration Measurement Uncertainty

Perhaps all that is needed is to know is the Insertion Loss of the LISN. Some manufacturers provide this for every s/n. The LISN is only there to provide a known impedance to the source of emission so that RF current can be measured with repeatability. I do understand that CM and DM

Re: [PSES] LISN Calibration Measurement Uncertainty

The point of the cm vs. dm discussion is that the effect of LISN impedance is not so important for dm as for cm, speaking very generally, so that the effect of uncertainty in LISN impedance on dm emissions is less than for cm. But we don't separately measure cm and dm, so we don't know, looking at

Re: [PSES] LISN Calibration Measurement Uncertainty

Sorry, I guess we drifted a little off topic, and that's my fault. If you want to characterize a LISN for the purpose of defining an measurement "uncertainty budget" then I suppose all that is needed is a carefully written test procedure. I doubt a Network Analyzer is required, I think a

Re: [PSES] LISN Calibration Measurement Uncertainty

I agree that the AMN (LISN) is intended only to provide consistent (more or less) results, not to represent a real-world impedance at RF. I don't know how much that impedance changes from site to site; quite a lot I'll bet. Ralph McDiarmid Product Compliance Engineering Solar Business

Re: [PSES] LISN Calibration Measurement Uncertainty

It's not quite as simple as it may appear. Mr Javor points out that it measures two mixtures of DM and CM voltages, which is not helpful either in fixing a design or in determining the consequent radiated emission (due to the CM component alone). The 50 ohms is indeed the input resistance of the

Re: [PSES] LISN Calibration Measurement Uncertainty

My understanding: A LISN seems to be a simple device, which has three ports: an input, an output, and a sense port. The sense port connects to the spectrum analyzer or EMI receiver, with the input port connecting to mains, and the output port connecting to the power terminals of the device

Re: [PSES] Composite Systems and Intentional Radiators

Hello, I'm re-sending this because I received comments that nobody had answered it (and I guess people were expecting me to answer it :) ) Thanks, Michael. From: Michael Derby [mailto:micha...@acbcert.com] Sent: 08 September 2017 09:18 To: 'Grasso, Charles'

[PSES] Test

Thanks Charles Grasso (w) 303-706-5467 - 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 All emc-pstc postings

Re: [PSES] LISN Calibration Measurement Uncertainty

Off-topic response. Grinding an axe. Clearly the network analyzer itself serves as a limit on the achievable uncertainty, but it should be much better than what is needed (+/-20% in the military world). That aside, consider that differential mode emissions tend to be low impedance relative to

[PSES] LISN Calibration Measurement Uncertainty

All,  We are interested in doing some in-house LISN calibrations (impedance verification only using network analyzer) and need to develop an uncertainty budget.  Does anyone happen to have a budget you could share with us? We will go through the exercise of calculating ourself but if there is

Re: [PSES] EN 62368-1:2014 DoW

That's what it SHOULD be, but for some reason it was proposed to withdraw from EN 62368-1 the text that allows parts conforming to the older standards to be used, with no date of withdrawal specified. Many National Committees have said that it must not be withdrawn until 2020-12-20, but there is

Re: [PSES] EN 62368-1:2014 DoW

Hello Bostjan. I was informed by a testing agency that the DOW was the same as EN 60950 i.e. 20-12-2020. Regards; Ian McBurney Design & Compliance Engineer. Allen & Heath Ltd. Kernick Industrial Estate, Penryn, Cornwall. TR10 9LU. UK T: 01326 372070 E: ian.mcbur...@allen-heath.com From:

Re: [PSES] EN 62368-1:2014 DoW

See my recent post about chaos. It applies to EN 60950-1 as well as EN 60065. With best wishes DESIGN IT IN! OOO - Own Opinions Only www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England UK is a sovereignty, not a Zollverein-ty From: McBurney, Ian

Re: [PSES] EN 62368-1:2014 DoW

Hello Bostjan. Do you know if EN 60065:2014 has the same withdrawal date as EN 60950? Regards; Ian McBurney Design & Compliance Engineer. Allen & Heath Ltd. Kernick Industrial Estate, Penryn, Cornwall. TR10 9LU. UK T: 01326 372070 E: ian.mcbur...@allen-heath.com From: Boštjan Glavič

Re: [PSES] EN 62368-1:2014 DoW

Yes, well, it's all in chaos. Several National Committees have asked CENELEC to change that date to 20 December 2020 or later. With best wishes DESIGN IT IN! OOO - Own Opinions Only www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England UK is a

Re: [PSES] EN 62368-1:2014 DoW

Hello Ian, EN 60065:2014 has a DoW 17.11.2017. This is in two months. For this standard CENELEC and OJ show the same DoW. Best regards, Bostjan From: McBurney, Ian [mailto:ian.mcbur...@allen-heath.com] Sent: Monday, September 11, 2017 10:54 AM To: Boštjan Glavič ;

Re: [PSES] EN 62368-1:2014 DoW

Hello Nick, Thank you for this clarification. Best regards, Bostjan From: Hooper, Nick [mailto:nick.hoo...@ul.com] Sent: Monday, September 11, 2017 10:23 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] EN 62368-1:2014 DoW Hello Bostjan The EU Commission are "aware" of this, the last

Re: [PSES] EN 62368-1:2014 DoW

There should be an explanation of such things at the top of the OJ list, but that would require intelligence, which is contrary to policy. With best wishes DESIGN IT IN! OOO - Own Opinions Only www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England UK

Re: [PSES] EN 62368-1:2014 DoW

I have flagged this up to the BSI committee, which may produce an explanation. With best wishes DESIGN IT IN! OOO - Own Opinions Only www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England UK is a sovereignty, not a Zollverein-ty From: Boštjan

Re: [PSES] EN 62368-1:2014 DoW

Hello Bostjan The EU Commission are "aware" of this, the last update to the LVD OJEU was to add "take into account the new status of the 60335-2-9" There are a number of updates in the pipeline and they are working with CENELEC. Best Regards Nick From: Boštjan Glavič

[PSES] EN 62368-1:2014 DoW

Dear all, There was new EU official journey published on Sep 08 2017, however still DoW 20.06.2019 is mentioned for EN 62368-1. Is anyone familiar about it? It is very important topic for customer who need to change certification for EN 60950-1 into EN 62368-1. Cenelec web page shows DoW as