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... in archives for at least 3 years. 4.3 Electrical testing The final test procedure of a PCB is the electrical testing to detect cuts | PRINTED CIRCUIT BOARDS SUPPLIERS | and shorts. Our engineers generate a test programm discribing a network, including all signal lines (start and endings) generated out of the gerber data of | PRINTED CIRCUIT BOARDS SUPPLIERS | the customer. As a middle and high volume manufacturer we use an adapter testing system that simultaneously tests all network lines and points of a | PRINTED CIRCUIT BOARDS SUPPLIERS | PCB. The basic technology of adapter testing is, that conductive needles linked to the test machine are lead by an adapter to the test points | PRINTED CIRCUIT BOARDS SUPPLIERS | of the PCB. The test result is then compared to the electrical network. A failure is detected if a network resistance is measured * bigger | PRINTED CIRCUIT BOARDS SUPPLIERS | than 50 Ohm (cut) * smaller 10 MOhm (short) PCB`s tested without failure are marked by a green line on the edge of the PCB | PRINTED CIRCUIT BOARDS SUPPLIERS | or by a stamp mark. Rejected PCB`s are separated, repaired and retested or finally rejected if repair is not feasible. The electrical test is not | PRINTED CIRCUIT BOARDS SUPPLIERS | standard ...
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... as possible. PCB`s should be taken out due to the „first-in, first out“ rule. The the polyethylene packages should be taken away just before | PRINTED CIRCUIT BOARDS SUPPLIERS | the assembling. Remaining PCB`s should be repacked again. To avoid exposure to draught, the packages should be stored in boxes. A.4 3 ) Soldering tests | PRINTED CIRCUIT BOARDS SUPPLIERS | PCB`s stored for over several months and being transported under questionable conditions, should be submitted again to a soldering test, being equivalent to your soldering | PRINTED CIRCUIT BOARDS SUPPLIERS | process. A.5 4 ) Heat conditioning of the PCB`s In any case we suggest a drying process of the PCB`s in a stove to reduce | PRINTED CIRCUIT BOARDS SUPPLIERS | the moisture in the PCB`s to an acceptable minimum. Following parameters can be recommended: A6) Drying time: Temperature C° 8 hours 120 10 hours 100 | PRINTED CIRCUIT BOARDS SUPPLIERS | 18 hours 80 Lower drying temperatures are also possible but need much more exposure time. We also suggest to put the PCB`s vertically in the | PRINTED CIRCUIT BOARDS SUPPLIERS | stove by using a rack. Good results can be achieved if the assembling process of the PCBs is started immediatedly ...
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... | A process of plating only a selected portion of a contact, usually the mating surface. Two methods can be used. 1)nickel plating the | PRINTED CIRCUIT BOARDS SUPPLIERS | entire contact, then gold plating the selected area, 2) nickel plating and then gold flash over the entire contact, and finally a selective heavy gold | PRINTED CIRCUIT BOARDS SUPPLIERS | plating in the desired contact area. | SEMI-ADDITIVE-PROCESS | An additive process for obtaining conductive patterns which combines an electroless metal deposition on an unclad | PRINTED CIRCUIT BOARDS SUPPLIERS | substrate with electroplating or with etching, or with both | SMOBC SOLDER MASK OVER BARE COPPER. | A method of fabricating a printed wiring board | PRINTED CIRCUIT BOARDS SUPPLIERS | which results in the final metallization being copper with no other protective metal but the non soldered areas are coated by a solder resist, exposing | PRINTED CIRCUIT BOARDS SUPPLIERS | only the component terminal areas. | SOLDER LEVELING |The process of dipping PCB's into hot liquids, or exposing them to liquid waves to achieve fusion. | PRINTED CIRCUIT BOARDS SUPPLIERS | First, flux is applied to the board by dipping or brushing. Then the board ...
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