... mµ thick when delivered. During storage, the diffusion of copper in the tin surface continues, causing the thickness of the pure copper or tin | PCB MAKER | layers to decrease. If the blended metal reaches the surface it becomes coated with a non- removable oxide, making soldering impossible. Storage possibilities of immersion | PCB MAKER | tin PCBs are, for this reason, considerably limited compared with conventional SnPb techniques: stored PCBs should be used up within 3 months and if time | PCB MAKER | exceeds 6 months, heavy processing problems can occur. The price of immersion tin is between that of the classical SnPb and the immersion nickel gold | PCB MAKER | surfaces. However, thiourea, which is used in the production, does not conform with environmental or effluent requirements, therefore the future costs for disposing of wastes | PCB MAKER | are difficult to calculate, particularly in view of the upcoming, stricter environmental regulations. Conclusion Immersion tin can be seen as a viable alternative, as the | PCB MAKER | surface offers many advantages ...
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... for fabricators to deal with because they have to worry about translators and parsers to read the aperture table information. As a result, aperture | PCB MAKER | data might be misinterpreted. Worse, someone might have typed in the information manually - and erroneously. By contrast, in 274X, all the aperture information is | PCB MAKER | contained within the Gerber file, which can be read by most CAM tools automatically. For netlists, | IPC-D-356 | is the preferred format for fabrication. | PCB MAKER | It's widely used by many of the bare-board test-fixturing machines and is one of the only true ways to identify power- to-ground shorts. With the | PCB MAKER | information in this format coming directly from the engineering CAD system, there's no danger of the fabricator "reverse engineering" the netlist from the Gerber files. | PCB MAKER | Next up are the internal | PLANE LAYERS |. For some reason, CAD engineers like them to be "positive," but those types of layers lead | PCB MAKER | to huge file sizes. Negative plane layers are usually preferred by fabricators ...
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... process control). The interprocessual examinations are made in accordance with inspection schemes. As a final output examination our quality assurance provides central an output | PCB MAKER | report on the basis of the systematically collected data, that documents the fulfilment of the assured characteristics. - | WITH THE ELECTRICAL FINAL | inspection | PCB MAKER | pcb´s are examined for short-circuit and interruption. The test system is loaded with the gerber data which is provided to us from the client. From | PCB MAKER | this gerber data a net list is generated, i.e. all testpoints are determined. In accordance with this prepared test program the test-fixture-plates are drilled and | PCB MAKER | equipped with test probes. The test probes led by the test-fixture system are steered on the concerned contact points. The test sample is then set | PCB MAKER | under current and the circuit is compared with the data of the client. The system separates printed circuit boards, on which a short-circuit or an | PCB MAKER | interruption was registered, from the ...
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