... a bit larger (0.002" to 0.003") and also convert them to a smaller size. (a) Allowing the operator and CAM software to convert lands | PRINTED WIRING BOARDS PROTOTYPING | could lead to errors in the design and, later, undesirable output. (b) Unintentional swaping of X and Y locations. (c) Offset or shift of original | PRINTED WIRING BOARDS PROTOTYPING | placement due to the software errors with the datum for the feature. * Conversion of draws is also necessary if the Gerber files used to | PRINTED WIRING BOARDS PROTOTYPING | plot the artwork are used to generate an electrical test netlist and fixturing files. All fixturing software must convert lands in order to produce a | PRINTED WIRING BOARDS PROTOTYPING | dependable netlist, that is, one that will test all points. If draw to flash is not completed when generating these files, the software will not | PRINTED WIRING BOARDS PROTOTYPING | place a test point for that feature, leaving that net untested. Open Road: Output plane layers in a negative format. THIEVING AND COPPER BALANCING Thieving | PRINTED WIRING BOARDS PROTOTYPING | and copper balancing is the process of adding a copper pattern to the outer layers of a board. Balanced copper helps to ensure ...
[ Printed Wiring Boards Prototyping ]... a good quality board to be produced. Another important criteria is the presence of orientation marks within the boundary of board. These marks could | PRINTED WIRING BOARDS PROTOTYPING | be the board reference so long as it cannot be read from the other side. (This is for your protection to prevent the boards made | PRINTED WIRING BOARDS PROTOTYPING | inside out). Images should comply with design rules that will result in a board that will meet performance and cost requirements. - Scale must be | PRINTED WIRING BOARDS PROTOTYPING | given, tapes securely stuck to the backing sheet, track to pad & track to track joints complete and the backing sheet clean. - Scale must | PRINTED WIRING BOARDS PROTOTYPING | be given and be at least 2:1. Plots must also offer sharp edge definition and traces dense enough for blocking light when photographing. - Preferred | PRINTED WIRING BOARDS PROTOTYPING | on 7mil (178mm) thick base for stability. Films should be plotted on laser photoplotter or on vector photoplotter using a minimum resolution of ˝mil (13mm). | PRINTED WIRING BOARDS PROTOTYPING | - Preferred in GerberŽ format although accepted in other formats. (Refer to CID-014 for information on Documentation in Digital ...
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[ Printed Wiring Boards Prototyping ]