FISCHER FISCHERSCOPE X-RAY 5000 Series, Operator'S Manual, Page: 139 / 188

FISCHERSCOPE
®
X-RAY 139
Description of the Characteristic Statistical Parameters Addendum
Range
R Difference between the highest and
the lowest reading of the selected
blocks
: Highest reading of the
selected blocks
: Lowest reading of the
selected blocks
Range
R
p
[%]
Range relating to the mean value
R
: Range
: Mean value of the single read-
ings of the selected blocks
LSL Lower Specification Limit
Specification limits (
USL
,
LSL
) can
be entered in the menu
Evaluation
> Final evaluation...
, tab
SPC
,
command button
Parameter
.
USL Upper Specification Limit
Estimated standard deviation of the
populations
s
I
: Arithmetic mean value of the
standard deviation of the blocks
s
II
: Standard deviation of the mean
values
s
I
Arithmetic mean value of the
standard deviations of the blocks
m
: Number of blocks
s
i
: Standard deviation of the block
i
s
II
Standard deviation of the mean
values
m
: Number of blocks
: Mean value of the block
i
: Mean value of the block mean
values
Parameter Description Equation
R x
max
x
min
– =
x
max
x
min
R
p
R
x
--- 100 =
x

ˆ

ˆ
s
I
2
s
II
2
+ =
s
I
1
m
---- s
i
i 1 =
m

=
s
II
1
m 1 –
------------- x
i
–
 
2
i 1 =
m

=
x
x
i
x