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By Allen Buckroyd (Auth.)

ISBN-10: 0750609303

ISBN-13: 9780750609302

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Therefore, any board type for which the production quantity is greater than 162, is ripe for ICT. For board types having production quantities between say 100 and 162, it may be sensible to produce a partial program and fixture, costing perhaps £1200. This may only save £12 per board tested, but the break-even equation is £1200 divided by £12 = 100 boards. If the production quantities ever rose, there could be a case for upgrading the program and fixture to save the full amount possible. 12 References 1.

Used during testing to define position in the test, and location of failing test. RES = Action verb as described, setting up the test conditions, applying stimulus, measuring the result. " R l " = The title of the component under test, as defined on the BOM and circuit diagram. This title will be displayed during the test, and printed out if the test fails, together with the measured value and a note such as: " R l . 560 KILOHMS". Programming - procedures, problems and solutions 59 10K = Nominal value.

The optimum process conditions for one type of board, with thin tracks, tightly packed with logic devices and low thermal mass, will not suit a power supply board with thick track, bulky components and a high thermal mass; one board will be trouble free, the other could contain many process faults. This problem is mitigated by flow solder machines which can be programmed for different styles of board, but there are so many variables it is difficult to maintain the ideal conditions for long. Random component failures will vary from a few parts per million to a few percent, leading to PCB failure rates up to 100%, and these failures must be detected quickly and cheaply.

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In-Circuit Testing by Allen Buckroyd (Auth.)

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