Yesterday I was able, for the first time, to get the effect (multiple discharges in the supply) from a high voltage oscillator producing 1400 Volt pulses that I built for about $10 as opposed to a commercial device costing over $10,000 (ESD gun or EFT pulser)!!! So now I can apply a few hundred thousand pulses (one per second) in a week during working hours to look for changes in the supply that might be safety issues or be a harbinger of failure in the field. ESD guns cannot be used this way and EFT generators likely will not let me pulse once per second as that is so different that what is required for 61000-4-4.
An applied pulse elicited multiple 1,000+ Volt pulses generated in the power supply and released into the environment as if I had applied additional ESD hits. Having such pulses unleashed in the middle of one’s system would certainly raise the risk of system malfunction. Doug Smith Sent from my iPhone IPhone: 408-858-4528 Office: 702-570-6108 Email: d...@dsmith.org Website: http://dsmith.org ________________________________ From: John Woodgate <j...@woodjohn.uk> Sent: Thursday, March 6, 2025 1:45:27 PM To: EMC-PSTC@LISTSERV.IEEE.ORG <EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] major safety issue possibly affecting 20% of the electronic devices in use Quite right, but any suggestion that a new failure mechanism might have been identified deserves serious consideration. In this case, the suggestion is more related to breakdown in service, rather than type-tests or end-of-line routine tests on newly-made products. It's somewhat analogous to fatigue failure in mechanical products. In the early days of colour TV in Britain, we had a spate of receiver fires, which were tentatively diagnosed as caused by leaving an unattended receiver on after the transmission had shut down, leaving the line timebase to run at an incorrect frequency. The broadcasters agreed to transmit a warning tone to call attention to the receiver left on. On 2025-03-06 21:22, Ralph McDiarmid wrote: Decades of application of IEC and UL standards have demonstrated the adequacy of product safety evaluation, particularly if done by 3rd party accredited agency. -- OOO - Own Opinions only If something is true: * as far as we know - it's science *for certain - it's mathematics *unquestionably - it's religion [https://s-install.avcdn.net/ipm/preview/icons/icon-envelope-tick-green-avg-v1.png]<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.avg.com_email-2Dsignature-3Futm-5Fmedium-3Demail-26utm-5Fsource-3Dlink-26utm-5Fcampaign-3Dsig-2Demail-26utm-5Fcontent-3Demailclient&d=DwMCaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=c9NR2mGfldry-2pM9Bbuww&m=3HqgNMsqtfsH-FC8D0wB-Mshq6fowDOP1MhDNenTfkMkwvu1vEH-bUB-zcq0Qb_X&s=PSE9qtoq4VJA3bU8QDblpu21AYHnkVk94CLjhcoSAao&e=> Virus-free.www.avg.com<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.avg.com_email-2Dsignature-3Futm-5Fmedium-3Demail-26utm-5Fsource-3Dlink-26utm-5Fcampaign-3Dsig-2Demail-26utm-5Fcontent-3Demailclient&d=DwMCaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=c9NR2mGfldry-2pM9Bbuww&m=3HqgNMsqtfsH-FC8D0wB-Mshq6fowDOP1MhDNenTfkMkwvu1vEH-bUB-zcq0Qb_X&s=PSE9qtoq4VJA3bU8QDblpu21AYHnkVk94CLjhcoSAao&e=> ________________________________ This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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