... when a land that is chosen for conversion has an extra length of vector to it, and the CAM software converts the others that | MULTILAYER CIRCUIT BOARDS PRODUCER | are similar to it into the same flash land. It can convert lands designed to be a bit larger (0.002" to 0.003") and also convert | MULTILAYER CIRCUIT BOARDS PRODUCER | them to a smaller size. (a) Allowing the operator and CAM software to convert lands could lead to errors in the design and, later, undesirable | MULTILAYER CIRCUIT BOARDS PRODUCER | output. (b) Unintentional swaping of X and Y locations. (c) Offset or shift of original placement due to the software errors with the datum for | MULTILAYER CIRCUIT BOARDS PRODUCER | the feature. * Conversion of draws is also necessary if the Gerber files used to plot the artwork are used to generate an electrical test | MULTILAYER CIRCUIT BOARDS PRODUCER | netlist and fixturing files. All fixturing software must convert lands in order to produce a dependable netlist, that is, one that will test all points. | MULTILAYER CIRCUIT BOARDS PRODUCER | If draw to flash is not completed when generating these files, the software will not place a test point for that feature, leaving that net | MULTILAYER CIRCUIT BOARDS PRODUCER | untested. Open ...
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... use. Due to the thin surface layer – a thickness of 0.15 – 0.3 mµ is recommended – the surface of the pad is | MULTILAYER CIRCUIT BOARDS PRODUCER | smoother and therefore there are, even in fine pitch areas, no restrictions when assembling. The silver functions merely as a protection against oxidation, and the | MULTILAYER CIRCUIT BOARDS PRODUCER | actual solder point is between the copper and chemical tin, therefore the solder point is absolutely stable. It fulfills all UL requirements (UL796 specif.) and | MULTILAYER CIRCUIT BOARDS PRODUCER | meets the usual requirements of automobile manufacturers: Test results Test AlphaSTAR Result Requirement SIR 85°C/85%RH 2.46+9 24h Passed >1E+8; IPC- 4553 IPC-TM-650 2.6.3.5 3.15E+9 96h | MULTILAYER CIRCUIT BOARDS PRODUCER | Passed SIR 35°C/85%RH 100VDC 3.56E+11 24h Passed >1E+10; IPC-4553 and GR 78 (Bellcore) IPC-TM-650 2.6.3.5 4.62E+11 96h passed EM 10V bias, 100V Test 2.46E+9 24h | MULTILAYER CIRCUIT BOARDS PRODUCER | initial Resistance no higher than the Power of 10 85°C/85%RH 1.18E+10 504h (21days) Passed Dendrites not Identified IPC-TM-650 2.6.14.1 Dendrites not Identified Passed IPC-4553 and | MULTILAYER CIRCUIT BOARDS PRODUCER | J-STD-004 lanic (static ...
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