Ed,
 
 Standard bare board test equipment with 100 mil grid is typically used for 
 BGA product. Depending on PCB design, fixturing software, and fixturing 
 style, one or more fixtures may be required. 
 
 Flying probe technology can be used cost effectively for a complete test 
 on small runs. Flying probe can also be used to test dense areas that 
 won't fit on one fixture. You need to look carefully at your testing costs 
 to determine if this is a good option. Many times a second fixture is more 
 cost effective. 
 
 Test equipment with more dense grids (80 mil, 75 mil, and 50 mil) can 
 obviously eliminate the need for a second fixture. 
 
 Working with PCB designers early on can often prevent density headaches at 
 test.
 
 
 Regards,
 
 Dennis Mitchell
 Zycon Corp.
 [log in to unmask]


______________________________ Reply Separator _________________________________
Subject: RE:BGA Bare Board Testing?
Author:  [log in to unmask] at corp
Date:    1/11/96 11:02 AM


What test process is used for bare board test of BGA's? Is this product tested 
with machines of 100 point/sq. grids. I am interested in the test process used 
testing these boards.
 
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Edward G. Shea                | Internet: [log in to unmask] 
Applied Cam Engineering       | Modem:    +714.529-7313
545 West Lambert Rd.          | Voice:    +714.529-1553 
Brea Ca. 92621                | FAX:      +714.529-4202
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