| I have just been assigned to look into the ionic chromotograhy test on our PCBA but I have zero knowledge. Could anyone help to explain what is this test about? Is it | a) a destructive test? | b) What is the measurement unit of this test? | c) What is the standard? | chiakl | Chiakl: My sympathies. Dave F
Ionic chromotography is a J-STD-001B type requirement for level 3 process control, which (paraphrased) goes something like this: The first step should be a benchmarking of the residues present on your bare boards, using a rigorous chemical analytical technique. Standard Omegameter testing would not fit in this category. For bare board analysis, ion chromatography (TM-650, method 2.3.28) is recommended. Ion chromatography allows us to identify not only what ionic species are present, but also the amounts. Different assemblies will have different sensitivities to various ionic species, but with a sufficient experience base, a skilled analyst can usually give a good indication of whether the fabrication residues will cause problems in SIR testing. The substrate used for the analysis should be actual bare boards that approximates your most difficult or demanding situation. Try IPC Technet for more ...
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