Morning Gary, In my experience noise resistance will depend on many factors e.g. self vs mutual capacitance method, the cap touch device selected, sensor design, etc. The major design trade-offs are sensitivity and speed of response vs noise resistance and available panel size. Cap touch tends to be as much of a mechanical design challenge (in mounting the sensor PCB as close to the touch surface as possible and minimising any low permittivity gaps (i.e. air) between the sensor and touch object) as an electronic design challenge.
I've had considerable success using a flexible PCB (not as expensive as I expected) and some 3M double sided adhesive tape to make a very compact and reasonably robust solution. Various noise protection strategies are available from different vendors. Microchip touch solutions use a driven guard plane to increase the sensitivity and to reduce the noise susceptibility which yields good results. With some crafty sensor design, it could probably perform even better. However, you may find a dedicated touch controller (from someone like Azoteq for instance) may have better noise resistance. Vendors do seem to be quite keen in this field and have many sample / evaluation kits to hand out. Hope this helps James From: Gary McInturff [mailto:gary.mcintu...@esterline.com] Sent: 30 August 2016 22:04 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] capacitive touch equipment Does anybody have any experience with us military electromagnetic immunity or emissions for P cap front panels. I understand from the water rain side of things but haven't yet been involved from emc end. mainly looking for it's a big issue or small issue for the p cap itself. Pcbs etc. I'm familiar with mil emc testing just not the pcap itself thanks Gary McInturff Reliability/Compliance Engineer Esterline Interface Technologies Featuring ADVANCED INPUT, GAMESMAN, LRE MEDICAL, and MEMTRON products 600 W. Wilbur AvenueCoeur d'Alene, ID 83815-9496 Toll Free: 800-444-5923 Tel: (208) 635-8306 www.esterline.com/interfacetechnologies<http://www.esterline.com/interfacetechnologies> Technology, Innovation, Performance... "Information in or attached to this e-mail message may be subject to export control restrictions of the International Traffic in Arms Regulations (ITAR) (22 CFR pts. 120-130) or the Export Administration Regulations (EAR) (15 CFR pts. 730-774). Before exporting this information outside the United States or releasing it to a foreign person in the United States, you need to determine whether a license under the EAR or the ITAR is required to do so. If you have any questions about this obligation, please contact me." Click here<http://www.esterline.com/governance/email_disclaimer/tabid/1532/Default.aspx> to read disclaimer - ---------------------------------------------------------------- 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 <emc-p...@ieee.org<mailto:emc-p...@ieee.org>> 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)<http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org<mailto:sdoug...@ieee.org>> Mike Cantwell <mcantw...@ieee.org<mailto:mcantw...@ieee.org>> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org<mailto:j.bac...@ieee.org>> David Heald <dhe...@gmail.com<mailto:dhe...@gmail.com>> - ---------------------------------------------------------------- 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 <emc-p...@ieee.org> 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 <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
