Gary:
By now you must know if you issue that warning in the manual, some doofus will try exactly that, and likely lubricate the tip of his finger with superglue. Simplest thing to me is to drop a “windscreen” fuzzball down that hole, so you can’t get close enough to the microphone housing to create an arc. Or maybe put a little drop-in collar that reduces the diameter beyond probe access size (which should then be maybe beyond 95 percentile doofus size too. Or, you could say that insertion of a finger into the mike hole activates the emergency lock-up feature. Ed Price [email protected] <blocked::mailto:[email protected]> WB6WSN NARTE Certified EMC Engineer Electromagnetic Compatibility Lab Cubic Defense Applications San Diego, CA USA 858-505-2780 Military & Avionics EMC Is Our Specialty From: [email protected] [mailto:[email protected]] On Behalf Of McInturff, Gary Sent: Tuesday, October 19, 2010 4:40 PM To: [email protected] Subject: to fix or not fix I have a dictation machine with plastic enclosure. With EN55024 as the driving standard it calls out 4kV contact discharge. The round tip will fit inside of the microphone opening and when it is pushed into the opening for about ½ inch it can discharge to the microphone enough that a discharge arcs to the microphone body the codex locks up. Not a good thing for criteria B since it requires the USB device to be plugged in and out to reset the power and clear the error. The standard says fix it and I know how to do that – its part or tooling costs – but my question is should I fix it? It just isn’t rational in my mind to actually use this as a test point it certainly isn’t going to occur during normal use and I just have trouble spending the money to protect against someone putting his finger down the opening (yes it will fit). They have to actively want to do that. Performance Criterion B After the test, the equipment shall continue to operate as intended without operator intervention. No dgradation of perfomrance or loss of function is allowed, after the application of the phenomena below a PERFORMANCE LEVEL SPECIFIED BY THE MANUFACTURE, when th equipment is used as intended. The peformance level may be replaced by a permissible loss of performance. This is a surface problem you have to stick your finger very deeply into the opening and since jamming your finger up to the first knuckle into the micophone opening pretty much prevents you from using the equipment as intended. Can the manual simply be updated to say don’t stick your finger in here or you’ll lock up the recording handset? I’m not trying to avoid a quality product or anything like that I just don’t want to put money to cure something that isn’t going to happen. Like I said I know how to fix it and I will fix it if I really need to, it’s a small tooling fix and/or a couple of components on the microphone lines. I’ve already tested the fix and it works – just don’t want to do it. Thoughts? Gary McInturff - ---------------------------------------------------------------- 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html 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]> - ---------------------------------------------------------------- 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html 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]>
