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4.4 Statistical Calculation Functions
60
The mean, maximum, minimum, standard deviation of population, standard devi-
ation of sample and process capability indices are calculated and displayed for
up to 30000 measurement values.
The calculation formulas are as follows:
• In these formulas, n represents the number of valid data samples.
• Hi and Lo are the upper and lower thresholds of the comparator.
• The process capability indices represent the quality achievement capability
created by a process, which is the breadth of the dispersion and bias of the
process' quality. Generally, depending on the values of Cp and CpK, process
capability is evaluated as follows:
Cp, CpK>1.33........................ Process capability is ideal
1.33
Cp, CpK>1.00............. Process capability is adequate
1.00
Cp, CpK...................... Process capability is inadequate
4.4 Statistical Calculation Functions
Mean
Standard deviation of popula-
tion
(=
n
)
Standard deviation of sample
(=
n-1
)
Process capability index (dis-
persion)
Process capability index (bi-
as)
n
x
x
n
x
n
x
2
2
1
2
2
n
x
n
x
s
1
6
n
Lo
Hi
Cp
1
6
2
n
x
Lo
Hi
Lo
Hi
CpK
• When only one valid data sample exists, standard deviation of sample and
process capability indices are not displayed.
• When
n-1
is 0, Cp and CpK are 99.99.
• The upper limit of Cp and CpK is 99.99. Values of Cp and CpK>99.99 are
displayed as 99.99.
• Negative values of CpK are handled as CpK=0.
• When comparator, range or auto-ranging settings are changed while statisti-
cal data is displayed, the display of Cp and CpK values changes to “- - . - -”.
• When normal measurement values and relative display values (%) are
mixed, correct calculation results cannot be obtained.
HIOKI BT3564A961-02
Содержание BT3564
Страница 2: ...HIOKI BT3564A961 02...
Страница 44: ...3 7 Displaying Measurement Results 38 HIOKI BT3564A961 02...
Страница 80: ...4 12 Reset Function 74 HIOKI BT3564A961 02...
Страница 89: ...5 4 Internal Circuitry 83 5 Chapter 5 External Control EXT I O 5 4 Internal Circuitry HIOKI BT3564A961 02...
Страница 98: ...6 3 Printing 92 HIOKI BT3564A961 02...
Страница 170: ...8 8 Sample Programs 164 HIOKI BT3564A961 02...
Страница 182: ...10 3 Error Indication 176 HIOKI BT3564A961 02...
Страница 202: ...Appendix 11 Dimensional Diagram A20 HIOKI BT3564A961 02...
Страница 206: ...Index 4 HIOKI BT3564A961 02...
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