I'm not sure why what to enter because the copper doesn't have dielectric constant but there is a spot for it. The readme file says the Er of the soldermask. I think i'm entering the right information. Thanks Mike.? -----Original Message----- From: Mike DeVita <mdevi@xxxxxxxxx> To: icu-pcb-forum@xxxxxxxxxxxxx Cc: icu-pcb-forum-bounce@xxxxxxxxxxxxx Sent: Tue, 16 Oct 2007 2:25 pm Subject: [PCB_FORUM] Re: hopefully question isn't silly Hi Sam, We use 5.8e7 for copper conductivity. You asked for loss tangent which is a dielectric material property. the larger the conductivity the more resistive the conductor is. Mike DeVita Staff Engineer, Application and Characterization Engineering VM 480 821-2408 ext 5021 EM mdevi@xxxxxxxxx FAX 480 855-6345 Sent by: icu-pcb-forum-bounce@xxxxxxxxxxxxx sjchar3 10/16/2007 02:20 PM Please respond to icu-pcb-forum@xxxxxxxxxxxxx To icu-pcb-forum@xxxxxxxxxxxxx cc Subject [PCB_FORUM] Re: hopefully question isn't silly found an answer, 59.6 X 10^6 but the tool has a default value to 595900, I guess that will have to do. -----Original Message----- From: sjchar3@xxxxxxxxxxxx To: icu-pcb-forum@xxxxxxxxxxxxx Sent: Tue, 16 Oct 2007 2:15 pm Subject: [PCB_FORUM] hopefully question isn't silly Group: Setting up "Layout Cross Section" and the top layer is 1 oz copper. In the same row it asks for conductivity, dielectric, loss tangent. Anyone know the loss tangent for copper? Sam Check Out the new free AIM(R) Mail -- Unlimited storage and industry-leading spam and email virus protection. ________________________________________________________________________ Check Out the new free AIM(R) Mail -- Unlimited storage and industry-leading spam and email virus protection.