电子产品测试方法入门（Introduction to testing methods for electronic products）.docVIP

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电子产品测试方法入门（Introduction to testing methods for electronic products）.doc

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电子产品测试方法入门（Introduction to testing methods for electronic products） Introduction to testing methods for electronic products The default 2007-07-31 17:40 classification number: 0 reading 124 comments greatly in small imagine this scenario: your quality assurance (QA quality assurance) manager to call you: we have a problem, you need to come here immediately. When you get to the scene, the QA Manager shows you a circuit board that just came out of the production line and has some white scum on it. What is it? If so, how much white scum should be allowed? What should be the measurements of the existing white scum? To answer these questions, you need a way to measure the white scum in the study. This method should help you find evidence and how much white residue exists. Start the measurement method (TM, test, method) What is the measurement method? For process control, quality assurance and failure analysis it is important to test methods that generalize the detailed procedures used to obtain data on test subjects such as boards, components, solders, and fluxes. These methods should be written in such a way that they are easy to follow and can be reproduced. A test method (TM) should be repeatable so that the results produced from different tests can be compared with each other at all times. A test method that follows difficult and / or insufficient detail may cause problems. For example, if a test method for circuit board assembly has cleanliness test, by measuring the leaching solution (extract solution) the conductivity, but there are no provisions for leaching temperature, it may get wrong results. Perhaps the white scum in the first example is a matter of cleanliness. To find out why, you test a board inside and send a piece of the same board to a separate lab test. Two facilities were subjected to a cleanliness test by reporting the results of the leaching of plates in ethanol / water solutions and measuring conductivity in the form of sodium chloride (NaCl) equi