Behind its simple appearance, the AQL table is complex, especially when we have to define the size of the sample for inspection. We all know the basics: identify the sample size based on the total order quantity is however what we all know there are different sizes of sampling AQL for critical defects, major and minor?
The official table AQL
Before any explanation, it is important to get the right tool. In the search for online AQL table, it is very easy to find different versions. However, only one is valid and the official version: download or view table AQL ISO 2859, ANSI / ASQC Z1.4.
Different size AQL sampling for critical defects, major and minor
The NCA table has two tables: table code letters sample size and single sampling plans for normal inspection table.
The table of single sampling plans for normal inspection is what interests us today. It accurately determines the final sample size AQL as defined tolerance level for each type of defect (critical, major and minor).
Table structure of single sampling plans for normal inspection:
The first and second columns, sample code size and sample size, identify the size of the sample
The first row, the limits of acceptable quality for one inspection, levels of acceptable quality limits (tolerances) are listed, the buyer can choose for each type of defect.
At the crossroads is not the size of the sample to be applied according to the tolerance level chosen for each type of defect.
Third party inspection company professionals usually choose three levels of tolerance (one per type of critical defect): 0, 2.5 greater, less than 4, so there are three sizes to determine sampling.
Paper arrows on a simple table sampling plans for normal inspection
these arrows are very important. In general they are missing in the AQL tables wrong on the internet, also creating misunderstandings.
The arrows indicate whether the sample size varies according to the tolerance assigned to each type of defect (critical, major and minor).
Consider two examples
Changes in the sample size for one or more types of defects
For a 160K to pieces of the overall sample size is 800pcs AQL however, when after three tolerances Professionals third party inspection companies: 0 Critical, Major 2.5, Minor 4, the size Variable sampling defects:
The sample size is the same for all types of defects
If, for the same amount of total 160Kpcs by the buyer choose their own tolerance levels for each type of defect, such as critical 0, 1 main and less than 1.5, the sample size is the same for all types of defects:
And you: is it at all clear to you? Feel free to share your doubts about how to determine the sample size AQL for critical defects, major and minor!
The official table AQL
Before any explanation, it is important to get the right tool. In the search for online AQL table, it is very easy to find different versions. However, only one is valid and the official version: download or view table AQL ISO 2859, ANSI / ASQC Z1.4.
Different size AQL sampling for critical defects, major and minor
The NCA table has two tables: table code letters sample size and single sampling plans for normal inspection table.
The table of single sampling plans for normal inspection is what interests us today. It accurately determines the final sample size AQL as defined tolerance level for each type of defect (critical, major and minor).
Table structure of single sampling plans for normal inspection:
The first and second columns, sample code size and sample size, identify the size of the sample
The first row, the limits of acceptable quality for one inspection, levels of acceptable quality limits (tolerances) are listed, the buyer can choose for each type of defect.
At the crossroads is not the size of the sample to be applied according to the tolerance level chosen for each type of defect.
Third party inspection company professionals usually choose three levels of tolerance (one per type of critical defect): 0, 2.5 greater, less than 4, so there are three sizes to determine sampling.
Paper arrows on a simple table sampling plans for normal inspection
these arrows are very important. In general they are missing in the AQL tables wrong on the internet, also creating misunderstandings.
The arrows indicate whether the sample size varies according to the tolerance assigned to each type of defect (critical, major and minor).
Consider two examples
Changes in the sample size for one or more types of defects
For a 160K to pieces of the overall sample size is 800pcs AQL however, when after three tolerances Professionals third party inspection companies: 0 Critical, Major 2.5, Minor 4, the size Variable sampling defects:
- Critical size defects sampling: 800pcs
- Defects Increased sample size: 500pcs
- Minor defects sample size: 315pcs
The sample size is the same for all types of defects
If, for the same amount of total 160Kpcs by the buyer choose their own tolerance levels for each type of defect, such as critical 0, 1 main and less than 1.5, the sample size is the same for all types of defects:
- Critical size defects sampling: 800pcs
- Defects Increased sample size: 800pcs
- Minor defects sample size: 800pcs
And you: is it at all clear to you? Feel free to share your doubts about how to determine the sample size AQL for critical defects, major and minor!
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