Electronics Forum | Wed Sep 02 11:54:34 EDT 2009 | davef
You can determine empirically what will work. * Use ion chromatography [IPC-TM-650 2.3.28] to evaluate the residues and determine if the residues must be removed. * Use energy dispersive spectroscopy for the elemental analysis or chemical characteriz
Electronics Forum | Wed Oct 18 16:33:26 EDT 2000 | Dave F
Mike: An omega meter has very little to do with ion chromatography. * IPC TM-650, 2.3.25B, Detection and Measurement of Ionizable Surface Contaminants is a process control method that washes boards with an isopropanol / water solution and measures
Electronics Forum | Fri Apr 15 14:06:24 EDT 2005 | saragorcos
Shean made some good points and offered some good starting resources. Adding to what he said, I would also mention that many times, even a no-clean flux can cause contamination that requires cleaning. Our lab has dealt with numerous cases of client
Electronics Forum | Thu Sep 26 15:28:16 EDT 2013 | joeherz
I know - A stimulating topic.... IPC-TM-650 2.3.28 method calls for a PCBA or PCB to be placed into a bag with solution, shake, analyze. Great. There is a method of doing this testing that focuses on a specific area of a PCB or a component where r
Electronics Forum | Fri Jun 05 15:06:26 EDT 1998 | Dave F
| 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) Wh
Electronics Forum | Sat Sep 04 06:25:07 EDT 2004 | GS
Many Thanks Dave for your patience (GBY). I was just trying to give a chance to our connector Supllier to read few micrograms less of NaCl found with the connectors. But even if using a "bonus formula" they are out of specs. Following it could be i
Electronics Forum | Thu May 26 19:32:13 EDT 2005 | Mike Konrad
Three popular methods: Resistivity of Solvent Extract (ROSE) Test Method IPC-TM-650 2.3.25: The ROSE test method is used as a process control tool to detect the presence of bulk ionics. The IPC upper limit is set at 10.0 *g/NaCl/in2. This test is p
Electronics Forum | Mon Jan 08 20:57:52 EST 2001 | Dave F
Are you talking about bare board cleanliness or assembly level cleanliness? Bare board cleanliness is still primarily measured by resistivity of solvent extract (ROSE) using instruments such as Omegameters and Zero Ions. What is considered as "acce
Electronics Forum | Thu Sep 17 11:09:32 EDT 1998 | Dave F
| I need an evaluation process to prove to a customer that our no-clean process does not leave excessive residue? Any ideas? Wayne: More of the same as Chry and Justin. KEY ISSUE The first thing that you need to know is: What does your customer me
Electronics Forum | Thu Sep 17 12:00:19 EDT 1998 | Mike C
| | I need an evaluation process to prove to a customer that our no-clean process does not leave excessive residue? Any ideas? | Wayne: More of the same as Chry and Justin. | KEY ISSUE | The first thing that you need to know is: What does your cus
