Electronics Forum | Mon Jan 14 12:44:05 EST 2008 | wayne123
I did some looking around awhile ago for a good used scope, and the best deals (on price) that I found were on Ebay, I am not sure if the manufacturers were reputable. Good luck, I was just looking for a good used mantis scope, but those are more the
Electronics Forum | Tue Jan 30 15:31:07 EST 2007 | slthomas
The must-do is to inspect for coverage and registration. How much bare pad and registration error you can tolerate is process and product dependant, but you can measure both fairly accurately with a reticle on a microscope. Developing measurement te
Electronics Forum | Tue Feb 22 07:58:16 EST 2005 | davef
We hear you. If it's not broken, why fix it? Right? Well intentioned, but not very educated customers seems to be part of the bane of existance of process engineers at contractors. First, as a previous poster said, paste height is an improper mea
Electronics Forum | Thu Mar 29 14:46:16 EDT 2007 | jmelson
Oh, I should have been more specific on microscopes. I have a Bausch & Lomb StereoZoom 5 and an old Olympus. They both work pretty well. I think the Olympus has a little better depth of field, but the B&L has better contrast. (Maybe the Olympus j
Electronics Forum | Mon Jan 12 21:31:26 EST 2015 | warwolf
The closer your inspection the more defects you will find, the more rework you do the possible cost you will add and the potential increase of damage you could do to your products if rework is not up to a machine copyable standard. "Is there any in
Electronics Forum | Tue Oct 26 02:22:51 EDT 1999 | Joe
dave: One more thing about dpmo, I should have mentioned before is, how do you measure dpmo in your production? About the post print inspection, how do I measure paste height? (I have a microscope, will this do?)
Electronics Forum | Thu Mar 15 17:19:03 EDT 2007 | bT_Solutions
By "digital video inspection system", I'll assume you mean AOI. I have only dealt with one AOI system, YesTech, and in my opinion I'd say that AOI is much more consistent and advantageous than manual microscope inspections. Specifically, with the Yes
Electronics Forum | Mon Jan 14 17:15:24 EST 2008 | jmelson
$200 is iffy, even for a used, reconditioned unit. I got an aged Olympus for about that some years ago, but had to make my own stand. There is a Chinese-made stereo microscope (no zoom) that is absolutely worthless for inspection, because the "thro
Electronics Forum | Tue Jan 15 15:53:14 EST 2008 | jmelson
I only build my own products, so it has to meet my needs for QA only. I am doing some 20 mil lead pitch (0.5mm) and will soon be doing a 0.4 mm pitch part. I have more magnification on my microscopes (40X) but almost never need to go that high. If
Electronics Forum | Tue Sep 18 10:43:59 EDT 2001 | henriksn
Hi, And thanks for the advice. I have tried your method now, and it seems to be working. By visual inspection with a microscope it was almost impossible to tell the differrence between the pcb that had been in the frig and the pcb's that were normal
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