A personal history, as intern/coop student, circa 1980-81, I was tasked with trying to capture the cap voltage just after disconnect. Because a consumer complained about getting shocked. Engineers general thoughts were it decays fast enough to not be a problem, and that ought teach the consumer to not touch the plug pins.Well I got the job of providing evidence.So setup scopes and a stock of polaroid film (only way for screen captures), after some time plugging and unplugging subject equipment, the high voltage and decay time were recorded.Consumer indeed could get shocked.Internal corp redesigned all pluggable power supplies to decay at an arbitrary rate influenced by safety opinions.And data went to committees for additional debates. And here we are !!!
Sent from Yahoo Mail on Android On Mon, Oct 17, 2022 at 18:01, Richard Nute<[email protected]> wrote: #yiv7518696537 #yiv7518696537 -- _filtered {} _filtered {}#yiv7518696537 #yiv7518696537 p.yiv7518696537MsoNormal, #yiv7518696537 li.yiv7518696537MsoNormal, #yiv7518696537 div.yiv7518696537MsoNormal {margin:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7518696537 span.yiv7518696537EmailStyle18 {font-family:New serif;color:windowtext;}#yiv7518696537 .yiv7518696537MsoChpDefault {font-size:10.0pt;font-family:sans-serif;} _filtered {}#yiv7518696537 div.yiv7518696537WordSection1 {}#yiv7518696537 See attached for a comprehensive discussion of X and Y capacitor discharge measurement techniques. In some standards, the use of a 100-megohm probe is accepted without correction for its resistance. Best regards, Rich IEEE Life Fellow IEEE Medal for Environmental and Safety Technologies - ---------------------------------------------------------------- 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 <[email protected]> All emc-pstc postings are archived and searchable on the web at:http://www.ieee-pses.org/emc-pstc.html Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]> To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&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 <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
