Citizen Systems SR-260N manual Cpk

Σx2 sum of the squares

xmean value

S	Sample Standard deviation Σx 2					− (Σx)2 / n
						n − 1
σ	Population standard deviation Σx 2 − (Σx)2 / n
								n
CP	Precision capability		USL − LSL
					6σ
CPK	Process capability		Min(CPU, CPL)
	where CPU =	USL −						− LSL
				x	CPL =		x
								3σ
		3σ

(Note) : In STAT mode, all function key are available, except base-n calculation.

(Ex. 1) : Enter the following data to calculate Σx, Σx2, n, x , S, CP, and CPK , where data 1 = 2, data 2~5 = 5, data 6~8 = 9, USL value : 12, LSL value : 2

In STAT mode			[ 2ndF ] [ STAT ]			DEG		STAT
							0. 0 0
			[ DATA ] 2			DEG		STAT
							2.
			[ DATA ] 5			DEG		STAT
							5.
			[ DATA ] 5			DEG		STAT
							5.
			[ DATA ] 5			DEG		STAT
							5.
Enter all data			[ DATA ] 5			DEG		STAT
							5.
			[ DATA ] 9			DEG		STAT
							9.
			[ DATA ] 9			DEG		STAT
							9.
			[ DATA ] 9			DEG		STAT
							9.
			[ = ]			DEG		STAT
							0. 0 0
						DEG		STAT
	x = ?		[ x ]
							6. 1 3
n = ?			[ n ]			DEG		STAT
							8. 0 0
S = ?			[ S ]			DEG		STAT
							2. 5 9
Σ		x = ?		Σ		DEG		STAT
			[ 2ndF] [ x ]				4 9. 0 0
				E16
SR-260N_English_090324.rtf				SIZE: 135x75mm /	SCALE 2:1		/ 2009/3/24