75
7Specications
No. 99MAM029A
7.2
CalculationSpecications
7.2.1 Effective Digits
The essential gures for calculation are as follows.
Setting the effective digits (number of digits after the decimal point) of input data as A,
the effective digits of each case are shown.
Symbol Meaning
Displayed effective dig-
its (after the decimal
point)
Tolerance
Data Input data A -
N Number of data - -
MAX Maximum value A -
MIN Minimum value A -
R Range A -
X Average A + 2 Lowermost digit ±1
σn Standard deviation A + 2 Lowermost digit ±1
σn-1 Sample standard deviation A + 2 Lowermost digit ±1
P Fraction defective (%) 3 Lowermost digit ±1
Cp Process capability index 3 Lowermost digit ±1
Cpk Process capability index 3 Lowermost digit ±1
LSL Lower specication limit value A Lowermost digit ±1
USL Upper specication limit value A Lowermost digit ±1
DIV
Number of divisions in histogram
Fixed to 10 divisions -
Histogram range display A + 2 Lowermost digit ±1
X¯ Center (X¯ control) A + 2 Lowermost digit ±1
X¯ - U C L Upper control limit (X¯ control) A + 2 Lowermost digit ±1
X¯ - L C L Lower control limit (X¯ control) A + 2 Lowermost digit ±1
R¯ Center (R control) A + 2 Lowermost digit ±1
R¯ - U C L Upper control limit (R control) A + 2 Lowermost digit ±1
R¯ - L C L Lower control limit (R control) A + 2 Lowermost digit ±1
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