IEC 61204-6 does look promising, but it does have a limit on output voltage of 200 volts d.c. I’ll assume like its power limit of 2,500 watts, its voltage limit can be extended by applying good engineering principles.
And it seems reasonably priced. Thanks for finding this John. Ralph From: John Woodgate <j...@woodjohn.uk> Sent: Tuesday, July 2, 2024 2:17 PM To: rmm.priv...@gmail.com Subject: Re: [PSES] power lsupply musings #1 IEC doesn't look too promising. These are not exactly on stone tablets, but they are old: IEC61204:1993 + AMD1:2001, IEC 61204-6: 2000. You can preview them. go to www.iec.ch <http://www.iec.ch> , then go to Web store and search. On 2024-07-02 20:01, Ralph McDiarmid wrote: Oh boy, have I seen this, in the distant past. Today, there is likely an IEC standard which defines how this measurement should be performed. When I was a development engineer at a small d.c. power supply company in the 1990s we grappled with this same issue. We eventually designed a custom voltage probe which measured differential ripple & noise into 50 ohms with a 20 MHz bandwidth. It provided a repeatable measurement of output noise into a stabilized impedance while rejecting common-mode contribution. Its implementation settled most arguments on how this measurement was done since some customers at the time were challenging our results when we were merely using an unbalanced 10X scope probe with any convenient oscilloscope on hand. Any, well considered, implementation for a noise probe is probably just as good so long as it is used consistently, and the method disclosed to those who need to know. Ralph From: doug emcesd.com <mailto:d...@emcesd.com> <d...@emcesd.com> Sent: Monday, July 1, 2024 4:18 PM To: EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: [PSES] power lsupply musings #1 Hi Everyone, I thought I would post a bit about power supplies. Something as simple as trying to measure ripple on the output can be very inaccurate, overstating ripple amplitude by a lot, 100% over stated is not all that unusual. One problem arises from common mode noise on the output that gets into the structure of the probe used for the measurement. Most probes have modes resulting in display of voltages that are not actually present. If you doubt this, just connect both terminals of a scope probe to the low end, say ground, of a power supply output and you will often see a significant signal that is not actually there. Whatever one measures with a shorted probe on the ground side of the supply output is the error in the measurement and can easily exceed the actual ripple voltage present on the output. Have you seen this? I cover this in detail in my presentations. Doug <https://lh4.googleusercontent.com/_HuR3Ky2TF_XhFHyxnYRmiq7nHQldnMsPNYFaLG6kb5T4y8MeCe-BDC_BscJtSFgszSSjssihHS-pjM3-jwNP8S0CwE-gN8fsRsPkojiAlmpBwb20vIVizS-siCUywW_jqrefbVr> _____ 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-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/ <https://www.mail-archive.com/emc-pstc@listserv.ieee.org/%20> Website: https://ewh.ieee.org/soc/pses/ <https://ewh.ieee.org/soc/pses/> Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) <https://ewh.ieee.org/soc/pses/list.html> List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: msherma...@comcast.net <mailto:msherma...@comcast.net> Rick Linford at: linf...@ieee.org <mailto:linf...@ieee.org> For policy questions, send mail to: Jim Bacher at: j.bac...@ieee.org <mailto:j.bac...@ieee.org> _____ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> &A=1 _____ 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-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/ <https://www.mail-archive.com/emc-pstc@listserv.ieee.org/%20> Website: https://ewh.ieee.org/soc/pses/ <https://ewh.ieee.org/soc/pses/> Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) <https://ewh.ieee.org/soc/pses/list.html> List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: msherma...@comcast.net <mailto:msherma...@comcast.net> Rick Linford at: linf...@ieee.org <mailto:linf...@ieee.org> For policy questions, send mail to: Jim Bacher at: j.bac...@ieee.org <mailto:j.bac...@ieee.org> _____ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> &A=1 -- OOO - Own Opinions Only Best wishes John Woodgate, Rayleigh, Essex UK Keep trying <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> Virus-free. <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> www.avg.com - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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