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Apr 21, 2022 at 06:30 AM
# How can I setup in SAP QM Sampling according to ISO SANS 3951-1 using MSSD?

**Can you please assist me in setting up the following in SAP - MSSD (Maximum sample standard deviation)**

**EXAMPLE (MSSD)** The minimum temperature of operation for a certain device is specified as 60 °C and the maximum temperature as 70 °C. Production is in inspection lots of 96 items. Inspection level II, normal inspection, with AQL = 1,5 %, is to be used. From Table A.1 (According to SANS Table ), the sample-size code letter is found to be F; from Table A.2 (According to SANS Table) it is seen that a sample of 13 is

required, and from Table D.1 (According to SANS Table) that the value of *f*s for the MSSD under normal inspection is 0,274. Suppose the measurements obtained are as follows:

65,5 °C; 60,0 °C; 65,2 °C; 61,7 °C; 69,0 °C; 67,1 °C; 60,0 °C; 66,4 °C; 62,8 °C; 68,0 °C; 63,4 °C; 60,7 °C; 65,8 °C;

compliance with the acceptability criterion is to be determined.

**Information needed Value obtained**

Sample size: *n*13

1 *n*

Sample mean: *x *= å *x **j*

*j *=1

Sample standard deviation: *s *=

64,28 °C

2,86 °C

(See J.1.2, Annex J.) (According to SANS)

Upper specification limit: *U*70,0 °C

Lower specification limit: *L*60,0 °C

Value of *f*s for MSSD (*s*max) (Table D.1) 0,274

*s*max = (*U *- L)*f*s 2,74 °C

As the value of *s *exceeds *s*max the lot may immediately be judged unacceptable.

NOTE This lot is not acceptable even though all inspected items *in the sample *are within the specification limits.