Protel中的Gerber文件各层介绍

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由Protel2004产生的Gerber文件各层扩展名与PCB原来各层对应关系表：
Layer:Fileextension
顶层Top(copper)Layer:.GTL
底层Bottom(copper)Layer:.GBL
中间信号层MidLayer1,2,...,30:.G1,.G2,...,.G30
内电层InternalPlaneLayer1,2,...,16:.GP1,.GP2,...,.GP16
顶丝印层TopOverlay:.GTO
底丝印层BottomOverlay:.GBO
顶掩膜层TopPasteMask:.GTP
底掩膜层BottomPasteMask:.GBP
TopSolderMask:.GTS
BottomSolderMask:.GBS
Keep-OutLayer:.GKO
MechanicalLayer1,2,...,16:.GM1,.GM2,...,.GM16
TopPadMaster:.GPT
BottomPadMaster:.GPB
DrillDrawing,TopLayer-BottomLayer(ThroughHole):.GD1
DrillDrawing,otherDrill(Layer)Pairs:.GD2,.GD3,...
DrillGuide,TopLayer-BottomLayer(ThroughHole):.GG1
DrillGuide,otherDrill(Layer)Pairs:.GG2,.GG3,...