Bob,
With you on this one, but do I presume that the defects measured would be
the criteria defined in IPC-610 and IPC-J-STD-001 for terminations and
placement and what about component defects? Screen print criteria? Class 1,2
or 3 to be stated with the DPMO figures? Sample vs 100%? Should we be
singing off the same hymn sheet?
Grant
-----Original Message-----
From: Bob Willis [mailto:[log in to unmask]]
Sent: Tuesday, November 13, 2001 7:26 PM
To: [log in to unmask]
Subject: [TN] PPM Monitoring and Benchmarking
Based on the SMART Group On-Line survey on defect monitoring, to date the
use of PPM Parts Per Million Monitoring is the most popular method which is
well covered in the IPC document see www.smartgroup.org
<http://www.smartgroup.org>
I have asked the question before but would engineers like to have an average
PPM level each month for screen print, component placement, reflow and wave
soldering to compare with their own production results. It would have to be
based on a known technology but could be valuable as a point of reference
for benchmarking. Its a little project we are considering over the UK and
would like to know its value to other engineers. I know there are many
issues but as long as everyone know what the data is, where it comes in
terms of board type NOT COMPANY and how its calculated I think it has a
value.
Please let me know your thoughts on the subject.
Bob Willis
Electronic Presentation Services
2 Fourth Avenue
Chelmsford Essex CM1 4HA
England
www.bobwillis.co.uk <http://www.bobwillis.co.uk>
Tel: (44) 01245 351502 Fax: (44) 01245 496123
Single solution to your seminar, conference or roadshow
www.seminar-registrations.com <http://www.seminar-registrations.com>
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