Good morning everyone,
I am having a debate with regards to first pass yields and
how testing strategy (ie.. ICT or Functional Test)
plays a role.
I am looking for any "factual data" or "industry
studies" that have been done to show the difference in yields between a batch of assemblies that are subjected to only visual inspection and to those batches that receive visual
inspection and some type of ICT or functional
test. I have my own internal data that
shows the differences but want to compare that against the industry.
Summary - I have a customer that is expecting 99% First pass yield (including board functionality) to their
facility but does not utilize or want ICT or functional testing done to
their products. Now the old rule of
thumb that I've gone by for many years is that visual inspection is
approx. 80% accurate and there are bound to be defects that slide through this visual
inspection process. To consistently achieve
yields in the high 90%'s additional test strategies should be looked
into. Note: The boards in question range
anywhere from 200 components per board to approx. 2000 components per
board.
Any feedback or published industry articles documenting the yield
differences between visual inspections only and using ICT/Functional testing
would be very helpful!
P.S. I have a meeting at
Thanks,
Badger Electronics