ST2523 Series Operation Manual Ver1.2
19
The instrument can make statistic analysis on up to 30,000 measurement results.
3.7.4
Statis A/Statis B
Move the cursor to it and select through the soft key. When A is selected, ST2523 will compare the
measurement result with the limit ranges of its primary parameter, count times of pass, times of higher and
lower results; When B is selected, ST2523 will compare the measurement result with the limit ranges of its
secondary parameter, count times of pass, times of higher and lower results;
3.7.5
Hi/Lo
Move the cursor to it and input the data through the numerical keyboard.
NOTE: Upper and lower limit values should match Statis A and Statis B. When the statistic mode is Statis A,
upper and lower limit values should be that of the primary parameter; when the statistic mode is Statis B, upper
and lower limit values should be that of the secondary parameter.
3.7.6
Parameter Specifications for Statistic Analysis
1)
X
: Average value. Corresponding formula:
x
x
n
2)
: Population Standard Deviation. Corresponding formula:
2
2
x
nx
n
(=
n
)
3)
s
: Sample Standard Deviation. Corresponding formula:
2
2
1
x
nx
s
n
(=
1
n
)
4)
p
C
: Process Capability Index (Dispersion). Corresponding formula:
|
|
6
p
Hi
Lo
C
s
5)
p
C K
: Process Capability Index (Deviation).
Corresponding formula:
|
| |
2 |
6
p
Hi
Lo
Hi
Lo
x
C K
s
NOTE: Explanations for variables in formulas from 1) to 5)
n
: The total measurement times that a sample is used to make statistic analysis, which
corresponds to the value of TIMES.
x
: Measurement results of each sample measurement. The data are saved in the instrument
buffer memory.
Hi
: Upper limit value, used to be compared, corresponds to the value of UPPER limit.
Lo
: Lower limit value, used to be compared, corresponds to the value of LOWER limit.
When
p
C
,
p
C K
> 1.33, the working capacity is ideal.
When 1.33
p
C
,
p
C K
> 1.00 , the working capacity is qualified.
When 1.00
p
C
,
p
C K
, the working capacity is insufficient.
