... > TERMINOLOGY AND TERMS OF PRINTED CIRCUIT BOARDS | | FEED-THRU OR VIAS | A plated-thru hole in a Printed Circuit Board that is | PRINTED WIRING BOARDS FABRICATORS | used to provide electrical connection between a trace on one side of the Printed Circuit Board to a trace on the other side. Since it | PRINTED WIRING BOARDS FABRICATORS | is not used to mount component leads, it is generally a small hole and pad diameter. | FIDUCIAL OPTICAL TARGET |. Also called OS. | | PRINTED WIRING BOARDS FABRICATORS | FINAL COPPER THICKNESS | The copper thickness stated in the PCB specification. This thickness is to be understood as the total thickness of copper foil | PRINTED WIRING BOARDS FABRICATORS | + copper plating. Fine-pitch SMD component with center-to-center terminal distances of less than 0,635 mm. Fluxing The process of removing oxides from a PCB to | PRINTED WIRING BOARDS FABRICATORS | prepare it for soldering. Fluxing lowers the surface tension of the solder and helps promote the formation of good solder fillets. Foil A thin continuous | PRINTED WIRING BOARDS FABRICATORS | sheet of metal, usually copper or aluminum, used as the conductor for printed circuits. Foils used for printed circuits are ...
[ Printed Wiring Boards Fabricators ]


... mode using specially designed horizontal processing equipment or in the vertical mode using a standard immersion type plating line. When choosing a processing method, | PRINTED WIRING BOARDS FABRICATORS | the following guidelines should be taken into consideration. Horizontal processing is recommended under the circumstances noted below. 1. Aspect ratios greater than 5:1 2. Plated | PRINTED WIRING BOARDS FABRICATORS | through-hole diameters smaller than 0.016 in (0.4 mm) 3. Blind vias 4. Thin, flexible materials If high aspect ratio and small holes are processed in | PRINTED WIRING BOARDS FABRICATORS | the vertical mode, vibration is recommended for each processing stage. The DMS-E process includes no cleaning sequence, therefore copper surfaces should be clean and holes | PRINTED WIRING BOARDS FABRICATORS | should be free of all drill debris. This may be achieved by chemical cleaning (e.g. ultrasonics) or by brushing with an ultrasonic section to remove | PRINTED WIRING BOARDS FABRICATORS | the drill debris prior to the DMS-E process. When processing double-sided panels through a horizontal line using sulfuric acid (e.g. Stabilizer) it is important to | PRINTED WIRING BOARDS FABRICATORS | ensure that ...
[ Printed Wiring Boards Fabricators ]


... and high volume manufacturer we use an adapter testing system that simultaneously tests all network lines and points of a PCB. The basic technology | PRINTED WIRING BOARDS FABRICATORS | of adapter testing is, that conductive needles linked to the test machine are lead by an adapter to the test points of the PCB. The | PRINTED WIRING BOARDS FABRICATORS | test result is then compared to the electrical network. A failure is detected if a network resistance is measured * bigger than 50 Ohm (cut) | PRINTED WIRING BOARDS FABRICATORS | * smaller 10 MOhm (short) PCB`s tested without failure are marked by a green line on the edge of the PCB or by a stamp | PRINTED WIRING BOARDS FABRICATORS | mark. Rejected PCB`s are separated, repaired and retested or finally rejected if repair is not feasible. The electrical test is not standard but we recommend | PRINTED WIRING BOARDS FABRICATORS | it to the customer if the following features are given: * high circuit complexity * trace/gap smaller 200µ * embedding circuits in ground layers (thieving) | PRINTED WIRING BOARDS FABRICATORS | * Multilayer Boards Although we assist our clients in the decision finding, it`s up to our customer to balance out the extra testing ...
[ Printed Wiring Boards Fabricators ]