Ken, the circuit posted does not contain any method for contact discharge. We tested to 20+ kV for commercial products in the 1970s when I was at Bell Labs using a circuit similar to the one posted in this thread. I remember that lab built simulator and used it many times then.
We also had home built lightning simulators we used long before the IEC or others got into that act for our own internal lightning standards. The Bell System was dealing with lightning well over a hundred years ago, probably before anyone else except possibly 1800s telegraph companies. That is too far back for me. Full scale ESD testing was certainly around at these high voltages by the time Touch Tone phones appeared. It was this research at Bell Labs that lead to the HBM model of ESD. We discovered that that model accurately predicted field hard failures of Touch Tone phones. Current HMM simulators are much more stress than our research at Bell Labs showed was necessary, at least for electronic circuits at the time, which were very susceptible. Doug Sent from my iPhone IPhone: 408-858-4528 Office: 702-570-6108 Email: [email protected] Website: http://dsmith.org ________________________________ From: Ken Javor <[email protected]> Sent: Monday, February 18, 2019 09:32 To: [email protected] Subject: Re: [PSES] ESD network schematic Doug may be correct, but that 25 kV sounds like MIL-STD-331, and that is a test of electro-explosive devices, particularly the fuses that light them, so there the risetime doesn't matter and it is a contact discharge. The problem is, my copies only go back to –331B dated 1989, and from there to the present day it is 500 pF and 500 ohms, and none of the parasitic control in the drawing in this post. I was unsuccessful in going back further. Ken Javor Phone: (256) 650-5261 ________________________________ From: "doug emcesd.com" <[email protected]> Reply-To: "doug emcesd.com" <[email protected]> Date: Mon, 18 Feb 2019 06:17:26 +0000 To: <[email protected]> Conversation: [PSES] ESD network schematic Subject: Re: [PSES] ESD network schematic It is obviously jistvair discharge only. I suspect this is from the 70s, maybe earlier. The output rise time will be slow further indicating a very early design when they thought ESD had a ten ns risetime. Doug Sent from my iPhone IPhone: 408-858-4528 Office: 702-570-6108 Email: [email protected] Website: http://dsmith.org ________________________________ From: Richard Georgerian <[email protected]> Sent: Sunday, February 17, 2019 20:11 To: [email protected] Subject: [PSES] ESD network schematic Greeting colleagues, I am trying to find out what standard or document the below ESD discharge network/ESD gun circuit comes from. It does not appear to come from either IEC 61000-4-2 or the MIL Standard. The Rs and Cs are the discharge network for a specific ESD waveform. The LS looks like the internal inductance of the ESD gun; the CH looks like the capacitance (maybe the parasitic capacitance of the ESD gun). The LH looks like the inductance of the ESD tip and the RH looks like the limiting resistor that is part of the ESD tip circuit. I cannot put a date as to when this schematic was made, so it could be something recent or from many years ago. [cid:3633334284_574616] Thank-you, Richard Georgerian Applications Engineer - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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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 Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
