(In theory, this is an option to allow you to look at multiple layers at once, although in reality how well it works depends on the actual bit patterns of the colors used for each layer.) In fact, the gerber viewer I use (gerbv, an open-source utility that runs on Windows, Macs, and Linuxes), has a display mode where the layer are displayed with their colors XORed together. I realized that it would also let you display multiple copies of the same layer, so that you could "flip" through them and (hopefully) notice changes. This has the advantage of simplifying the "picture", AND most gerber viewers will load up multiple layers of a PCB so that you can see them all together.
Now, one way to look at a PCB is to generate gerbers (the standard "plotter format" for PCBs), and use one of the gerber viewers to look at those. And EAGLE won't open multiple files at one time, so that you can compare them side-by-side, either.) (EAGLE won't directly open the backup files, so you have to rename each backup before you can look at it. This can be very valuable if you screw something up, but I've always been a bit frustrated that it isn't easier to look at those files to see what changed in which revision. The EAGLE Schematic/PCB editor keeps up to 10 backups of your board and schematics, reflecting the board start at the last times you saved you work.
0 kommentar(er)
