I would measure ohms per square using a milliohm meter. Also, another critical parameter is how hard the coating is. If the new coating is much harder than the original, it will likely make for poorer conductivity at any seams, resulting in lower shielding effectiveness even if the material conductivity is similar. A gasket might then be required where none was previously.
Marko Radojicic¹s comment bears directly on this issue. The connection between probes and coatings should be identical, including applied pressure. If more pressure needs to be applied to get good results, that is a measure of the surface hardness. Ken Javor Phone: (256) 650-5261 From: Brian Kunde <bkundew...@gmail.com> Reply-To: Brian Kunde <bkundew...@gmail.com> Date: Tue, 11 Apr 2023 15:45:29 -0400 To: <EMC-PSTC@LISTSERV.IEEE.ORG> Subject: [PSES] How to Measure Surface Conductivity? I have been given two samples of metal plates; one plated in our current material and the other with a new plating material we want to switch to in production. I have been tasked to compare the electrical surface conductivity. What is the best way to do this? How is this done in the industry? I have tried the following methods; 1. DMM (Ohm Meter) = inconclusive results 2. Used 5 volts from a current limited power supply and measured the current = inconclusive results 3. Used our Ground Bond Tester set to 60 amps. One plate measured 3-4m, the other 1-3m I measured 1 inch apart and from corner to corner. Test #3 above is the only test that showed any difference. BTW, I use 3/4" squares of soft braid material between the probes and surface. The probes are zeroed out between tests. So far, I can conclude that the new material is as good as, or slightly better than our current production plating material. What more can I do, within reason? Thanks to all. The Other Brian - ---------------------------------------------------------------- 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 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: Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com> 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 <emc-p...@ieee.org> 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 <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
