Process Capability; Probability Distribution - Citizen SRP-285N Anweisungshandbuch

2
Σ x or Σ y
Σ x y

Process capability

Step : ( See Example 53~54. )
1. Press [ DATA ] and there are three menus : DATA–INPUT ,
LIMIT–SET , DISTR . Please select LIMIT–SET and press
[
2. Enter an upper spec. limit value ( X USL or Y USL ), then
press [
3. Enter a lower spec. limit value ( X LSL or Y LSL ), then
press [
4. Enter the datasets you want under DATA–INPUT mode.
5. Press [ 2nd ] [ STATVAR ] and scroll through the statistical
results menu by [
variables you want. ( See table below )
Variable
Cax or Cay
Cpx or Cpy
Cpkx or Cpky Minimum (C
(Note) : When calculating process capability in 2–VAR mode, the
x and y
n

Probability distribution

Step : ( See Example 55. )
1. Based on the datasets in 1–VAR mode, press [ DATA ] and
there are three menu : DATA–INPUT , LIMIT–SET , DISTR .
Please choose DISTR and press [
2. Enter a a
3. Press [ STATVAR ] and scroll through the statistical results
menu by [
variables you want. (See table below)
File name : CBM_SR285,A_HDBSR285T19_English.doc
version : 2010/04/26
2 2
Sum of all x values or y
Sum of (x y) for all x-y pairs
].
].
].
] or [
Meaning
Capability accuracy of the x values or y values
Potential capability precision of the x values or y
values,
, C
PU
where C is upper spec. limit of capability
PU
precision and C
capability precision
C = Min (C
pkx PUX
C = Min (C
pky PUY
are independent with each other.
n
value, then press [
x
] or [ ] to find out probability distribution
E – 17
2
values
] to find out process capability
,
,
) of the x values or y values,
PL
is lower spec. limit of
PL
, C ) = C (1 – C
PLX px
, C ) = C (1 – C
PLY py
].
].
)
ax
)
ay