From Wikipedia, the free encyclopedia Automated X-ray inspection
Automated X-ray inspection
Automated X-ray inspection (AXI is a technology based
AXI)
on the same principles as automated optical inspection
References
(AOI). It uses X-rays as its source, instead of visible light, [1] X-Ray Inspection for PCB and BGA
to automatically inspect features, which are typically
hidden from view.
The increasing usage of ICs (integrated circuit) with
packages such as BGAs (ball grid array) where the con-
nections are underneath the chip and not visible, means
that ordinary optical inspection is impossible. Because
the connections are underneath the chip package there is
a greater need to ensure that the manufacturing process
is able to accommodate these chips correctly. Additional-
ly the chips that use BGA packages tend to be the larger
ones with many connections. Therefore it is essential
that all the connections are made correctly.[1]
AXI is often paired with the testing provided by
boundary scan test, in-circuit test, and functional test.
Process
As BGA connections are not visible the only alternative
is to use a low level X-ray inspection. AXI is able to find
faults such as opens, shorts, insufficient solder, excessive
solder, missing electrical parts, and mis-aligned compo-
nents. Defects are detected and repaired with in short de-
bug time.
These inspection systems are more costly than ordi-
nary optical systems, but they are able to check all the
connections, even those underneath the chip package.
Related technologies
The following are related technologies and are also used
in electronic production to test for the correct operation
of electronics printed circuit boards.
• In-circuit test (ICT)
• Joint Test Action Group (JTAG)
• Automated optical inspection (AOI)
• Functional testing (see acceptance testing)
Retrieved from "http://en.wikipedia.org/w/index.php?title=Automated_X-ray_inspection&oldid=454043249"
Categories:
• Hardware testing
• X-rays
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From Wikipedia, the free encyclopedia Automated X-ray inspection
X-ray zoom series on an old token ring network adapter card
2