Electronics Forum | Mon Jan 11 18:07:55 EST 1999 | Lech Bartnik
| | | This is a question for those of you who actually assemble components onto a board. | | | Any idea what the "industry standard" is for fall out on assembled PCB's? I realize that the controls put in place in your processes will effect your ove
Electronics Forum | Wed Oct 15 09:53:01 EDT 2003 | markhoch
These boards also were above liquidus for 75 seconds, and the customer puts the boards thru extensive thermal shock and stress testing. An Alpha Applications engineer told me that because the boards were above 183 degrees for 65-75 seconds that the i
Electronics Forum | Tue Dec 07 14:21:41 EST 1999 | Brian W.
In my experience, the most commonly accepted theory is that 100% inspection is only 80% effective AT BEST. That means that if your inspoectors are happy, noy outside concerns, well-rested, etc, they will catch 80% of the defects. This number goes d
Electronics Forum | Wed Apr 04 10:32:10 EDT 2018 | dleeper
At an EMS I used to work for, our process for first article inspection was to have a human technician do a point to point comparison between the BOM and the PCB. They would verify component part #s were correct per the location, correct polarity and
Electronics Forum | Mon Jul 08 05:10:56 EDT 2002 | bayanbaru
We are assigned to set-up an ESD control at a new site. There are a few proposals in mind, they are 1) conductive flooring with heel strap or shoe 2) wrist strap with continuos monitoring 3)the normal wrist strap with the common grounding point. Woul
Electronics Forum | Tue Dec 14 09:53:03 EST 2004 | paul_fisher
Yep fully functional and failed during the test. 25 to 55C in 3 hour hold for 9 hours then 55C to 25C in 3 hours hold for 9 hours then repeat. Humidity at 95 percent! Boards only part conformally coated. Growth with and without the coating. seems to
Electronics Forum | Thu Oct 05 13:33:28 EDT 2017 | duchoang
We did some tests with good result. No failure physically and functionally. Is there report/study/documents about this procedure so we can convince customer to approve our process using ultrasonic wash. Thank you, Dave
Electronics Forum | Tue Mar 28 14:23:11 EDT 2023 | smith88
Glass Micro BGA- I consistently have chips or micro cracks from the manufacture and some happen during install, what functionality risk do these pose to the product? They pass test... I cannot find an established criteria for this type of component
Electronics Forum | Thu May 17 15:17:42 EDT 2001 | blnorman
Parylene is arguable the best conformal coating there is, unfortunately it's also the most expensive. We had considered using it some time back, but due to environmental and safety issues, we would have had to build a new building to house the proce
Electronics Forum | Mon Feb 15 17:57:01 EST 1999 | Earl Moon
| Hope some of you out there can help me with this one. | I am getting feedback from our test department that they are showing opens on solder joints which have visually good wetting. The touch-up operators confirm that the joint looks good. All they
