If you are the customer, the acceptable defect level is 0, regardless of
class. But seriously, I have seen figures published that indicate visual
inspection to be, at best, 80% effective. I think that number probably
varies a lot based on time of day, day before or after a weekend or holiday,
complexity of the board, etc. Rather than setting an acceptable level, I
would concentrate on having a process that is as robust as possible and
having a system that identifies defects before they get out the door.
Bob
Robert Barr
Manufacturing Engineering
Formation, Inc.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Cathy Killen
Sent: Thursday, October 18, 2001 7:34 AM
To: [log in to unmask]
Subject: [TN] Solder Joint Defects
Importance: High
Could anyone help with this.
When visually inspecting PCBs to class 3, is there an acceptable percentage
of faults missed? Also is there an acceptable defect level considering PPM
with regards to soldered joints.
Cathy Killen
Training Instructor
Smtek Europe Ltd.
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