FISCHER FISCHERSCOPE X-RAY XDLM 231, Operator'S Manual

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192 FISCHERSCOPE ® X-RAY
Addendum
[1] Graf, Henning, Stange und Wilrich: Formeln der angewandten mathematischen Statistik
(Equations in Applied Mathematical Statistics) ; Springer Verlag (Springer Publishing
Company)
Coefficient of
variation
V
[%]
Ratio of the standard deviation to
the mean value
s
: Standard deviation
: Mean value of the block
For sufficiently large samples it can
be said:
: Standard deviation
: Mean value
Range
R
Difference between the maximum
and the minimum values of the block
:Highest reading of the block
:Lowest reading of the block
Range R
p
[%] Range relating to the mean value
R : Range in percent
: Mean value of the block
n (< LSL ) Number of measurements that are
below the lower specification limit Specification limits ( USL , LSL ) can
be entered in the menu
Evaluation > Final evaluation… , tab
SPC , command button Parameter .
n (>
USL
) Number of measurements that are
above the upper specification limit
Parameter Description Equation
V
s
x
-- 100 =
x
V


--- =


R x
max
x
min
– =
x
max
x
min
R
p
R
x
--- 100 =
x