Good day to you.
Appreciate if you can share with me on the DPMO calculation in details if
you have it.

rgds
sumxp
----- Original Message -----
From: "Paul Baine" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, August 12, 2005 11:30 PM
Subject: [TN] Calculation of solder defect rates


> Hello all,
>
> I have not used this forum for a few years so I hope I'm doing this
> right.
>
> I have a question re calculation of defect percentages for PCB
> Assemblies.  The old MIL-STD-2000 standard defined a "defect
> rate" as the number of observed defects divided by the "normalizing
> number".  The standard requires calculation of the following:
>
> (1) an Assembly Defect Rate, which is the assembly defects
> divided by the normalizing number, where Normalizing Number is
> (total no. of components, component leads, terminals and wires on
> the
> assembly plus one for the PWB);  and
>
> (2) a Solder Defect Rate, which is the solder defects divided by the
> normalizing number, where Normalizing Number is (total no. of
> terminals plus total no. of solder connections).
>
> I cannot find any guideline in J-STD-001 or IPC-A-610 for
> calculating defect rates.  I am trying to find some non-time-
> consuming method for calculating the Normalizing Numbers.  For
> example, would the Solder Normalizing Number just be the total
> no. of component leads?
>
> I would appreciate some guidance.  Thanks in advance.
>
> Paul Baine
> Q.A. Manager
> C-Tech Ltd.
> Cornwall, Ontario, Canada
>
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