As soon as I saw Derek's query, I immediately remembered reading the description of a parallel plate design in volume 4 of Don White's six-volume encyclopedia set (the grey ones). He suggested using IRC 90 ohm per square resistive cards as the load on a 90 ohm plate.
I looked that up, and while IRC is still around as a subsidiary of someone else https://www.ttelectronics.com/products/brands/irc/ I didn't see sheet resistors listed as a product line. But you might be able to build your own, depending on the ohms/square you need - post didn't say. A very cheap approach is right here: https://www.aircraftspruce.com/catalog/cspages/drygraphite5200.php Don't know if it will work, but at $4.90 for a ten ounce can, you can hardly go wrong. You could look at thin nichrome sheets: http://www.goodfellow.com/catalogue/GFCat4J.php?ewd_token=iKECcA3mig8UWSR3vZ 1byT8BCGlfZB&n=rdShuSJA5wBBHryYqRL16YQvFa1D35 This stuff is 5 um thick and at the quoted resistivity of 108 micro-ohm-cm, I calculate about 0.21 ohm per square. Here's another site offering a range of materials: https://www.tokkin.com/materials/high_parformance/resistance I have heard of etching a PCB to make the copper layer very thin. But that sounds more complicated, and again, it's going to depend on the ohms per square your application requires. Ken Javor Phone: (256) 650-5261 > From: DEREK WALTON <000000734758d943-dmarc-requ...@listserv.ieee.org> > Reply-To: DEREK WALTON <lfresea...@aol.com> > Date: Sat, 9 Mar 2019 21:42:49 -0600 > To: <EMC-PSTC@LISTSERV.IEEE.ORG> > Subject: [PSES] Sheet resistor material > > Hi All, > > I¹m looking for a source for Sheet resistor material. So far my internet > searching has pulled up nothing, can anyone give me some pointers? > > Thanks, > > Derek. > > - > ---------------------------------------------------------------- > 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> - ---------------------------------------------------------------- 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>
