Measurements I made in the last few days now show the internal discharges are about as intense as the original stress, but of course are inside the system so are more serious. So it appears an ESD event may be more likely to affect a system. Coming at once per second, not every pulse causes the internal discharges so a level of uncertainty in the test result is added.
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. 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