FISCHER FISCHERSCOPE X-RAY 5000 Series, Operator'S Manual, Page: 137 / 188

FISCHERSCOPE
®
X-RAY 137
Description of the Characteristic Statistical Parameters Addendum
[1] Graf, Henning, Stange und Wilrich: Formeln der angewandten mathematischen
Statistik
(Equations in Applied Mathematical Statistics) ; Springer Verlag (Springer
Publishing Company)
C
pk
Process capability index
Computed and displayed only if
specification limits are enabled
USL
: Upper specification limit
LSL
: Lower specification limit
: Estimated value for the mean
standard deviation
s
: Number of blocks
s
i
: Standard deviations of the
blocks
Blocks (<
LSL
)
Number of block mean values that
are below the lower specification
limit
LSL
Displayed only if specification limits
are enabled
Blocks (<
LSL
)
[%]
Number of block mean values that
are below the lower specification
limit
LSL
in percent
Blocks (>
USL
)
Number of block mean values that
are above the upper specification
limit
USL
Blocks (>
USL
)
[%]
Number of block mean values that
are above the upper specification
limit
USL
in percent
Parameter Description Equation
C
pk
Min C
pu
C
po
,
 
=
C
pu
LSL –
3

ˆ
------------------- =
x
C
po
USL –
3

ˆ
-------------------- =
x

ˆ

ˆ
1
n
Bl
-------- s
i
2
i 1 =
n
Bl

=
n
Bl