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. ------------------------------------------------------------- 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 -------------------------------------------------------------