I don't know whether we are looking at the same web page, but=20 =20 claims the sheet resistance to be 0.087 ohms / square. How much more=20 math do you need? But that's not my motivation to comment, which is more about the photo=20 of the resistivity test. A Radio Shack meter with regular leads stuck=20 on the surface of the board displaying 0.7 ohms. Most cheap meters I've=20 used will measure the same value with the leads shorted together, and=20 they have no calibration knob. Joe W On 7/17/2014 9:30 AM, Peter Johansson wrote: > On Wed, Jul 16, 2014 at 9:39 AM, Tobias Gogolin wrot= e: > >> Reprintable circuits! > Before you get too excited, scroll down to the section on > conductivity. It is only 2-3 lines and easy to miss. Then calculate > the resistance of typical PCB traces from the information provided. > There is a *reason* they don't do the math for you. This is basically > useless for anything other than digital signals. > > -p. --=20 Joe Wronski jwronski@stillwatereng.net www.stillwatereng.net --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .