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Casio FP-200 - X-R Control Chart; Program Outline; Directions

Casio FP-200
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x-R
CONTROL CHART
This application requires a plotter-printer.
l~t·Zthiul•ttOm
Control
charts
are used
mainly
for
quality
con-
trol
and
analysis
of
processes.
They
are
useful
for
obtaining
an overall view
of
particular
data.
The
x
-R
chart
is
typical
of
various
control
charts
based
on
measured
values.
The
x -
chart
represents
the
change
in
the
mean
value
in
the
distribution
of
data
and
the
R-chart
represents
the
change
in
the
range
of
the
data.
Input
data
can
be
preserved
on
cassette
tape.
The
results
of
processing are
output
in
the
form
of
charts
(graphs)
and
a
table.
This
application
requires
the
FP-1011 PL
plotter-printer.
••WlM,tl
A
Chart
preparation
process
(1)
Collected
data
is
arranged
according
to
the
time
of
measurement
or
lot
number,
then
divided
into
groups,
which
are
input
one
at
a
time.
The
sizeun
of
a
group
(the
number
of
data
items
comprising
a
group)
is
from
2
to
6.
The
value
of
n
should
be
predetermined.
·
(2)
For
each
group,
the
mean
value x
and
the
range
Rare
calculated.
Mean value x = "i:,x/n
Range
R=
xmax
-Xmin
(xmax:
maximum
value,
Xmin:
minimum
value);
(3)
The
total
mean
and
the
average range
are
calculated.
Total
mean x = "i:,x/k
A verange range R =
"i:,R
/ k
k:
Number
of
groups.
(4)
The
control
limits
forx
and
R
charts
are
calculated.
Control
limits
for
.x-chart
CL
=x
UCL
=x
+
A2R
LCL
=x
-
A2R
Coefficients
of
A
2/D4
Control limits
for
R-chart
CL=-~
UCL=
D4R
(
LCL
=
DJR
is
not
used.)
:G.,~f>.'•!~!'••;
;;-i~:4·
.f&,1;.:.u.«i:'
o~isJ
: • I
,•
•t'>
,'
• . • • • , •
••,
..
:.,~::D,.\,:f,~
.f
3°?267
2:·s1s
2:2a'2
2'~hs
too4
____
..
,·
- .
.,.,
...:;:._,_·1,•
·•·.·
~
,-
- .
(5)
Graphs
and
a table are
prepared
based
on
the
results
of
processing.
43

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