DEK高级培训资料.pdf - 第211页

Cp = 1 T OLERANCE Process Capability (Cp) Issue 2: July 2007 Cp = 2 Cp = 1.33

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TOLERANCE
CAPABLE
Process Capability (Cp)
Issue 2: July 2007
CAPABLE
The pattern’s width
divided into the Tolerance
goes MORE than 1.33
INCAPABLE
The pattern width divided into
the Tolerance goes LESS than 1.33
Cp = 1
TOLERANCE
Process Capability (Cp)
Issue 2: July 2007
Cp = 2
Cp = 1.33
Cp
Cp =
TOLERANCE RANGE
PATTERN WIDTH
=
TOLERANCE RANGE
6 x stdev
Process Capability Formula
Issue 2: July 2007
SIGMA
SIGMA =
SPECIFIED LIMIT
STANDARD DEVIATION
SIGMA =
0.5 x TOLERANCE RANGE
1 x stdev