On Sat, Aug 23, 2008 at 1:48 PM, John Griessen <[EMAIL PROTECTED]> wrote: > Eric Brombaugh wrote: >> Dave McGuire wrote: > >>> I'd be shocked and amazed if they could detect thermal IR. >> >> Agree - there's a big difference between the short-wave IR that's used >> by common IR remote controls (which is easily seen on most any webcam) >> and the long-wave IR used in thermal imaging. > > Ohh... we can control the situation to get near enough IR. We're looking > for shorts > anyway, not normal operating temps of + 1 degree... Seeing just the really > hot spots > -- meaning 120 deg F is plenty good, and the amount of near IR in that > temperature surface is > enough to see with a CCD I bet. Thermally emitted IR is a continuous curve > or frequencies for a given temperature. > Low temps just emit less near IR, but always some. > > So, I still bet CCD cameras could be very useful even without long IR > sensitivity for > a short detector, including shorted outputs and shorted traces. > > One way to test shorted traces without just burning through them would be to > power with a current source > to generate heat, then look with hacked CCD camera. >
Don't discount just burning through the short. In my experience, random PCB shorts are usually caused by a tiny whisker of copper. Vaporize it and the board will work fine. No heroic troubleshooting devices required. Regards, Mark [EMAIL PROTECTED] -- Mark Rages, Engineer Midwest Telecine LLC [EMAIL PROTECTED] _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
