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a.Acceptance Sampling Method
Home Trend: your Eyes in the Factory ! Home Trend quality inspectors in China and through Asia use the MIL-STD-105E tables, which are recognized standards by every industrial company.
This American standard now has equivalents in all national and international standardization organizations (ANSI/ASQC Z1.4, ISO 2859, NF06-022, BS 6001, DIN 40080).
This standard is a proven method to accept or reject a production lot by inspecting a randomly selected number of products.
Acceptance Sampling is used to decide whether to accept or reject a production. It is performed once the production lot has been completed and packed.
The basic procedure of Acceptance Sampling is:
- Take a lot of product
- Select a sample from the lot
- Inspect the units in the sample
- Use the result to decide whether to accept or reject the lot.
b.MIL-STD 105E tables or AQL table
Practically, Home Trend Quality Standards use the MIL-STD-105E tables that are summarized below:
TABLE A
TABLE B
NB: What can I find out from the AQL tables?
Let's take a lot of 4,000 units to inspect, with an AQL of 2.5%.
According to Table B, the sample size is therefore 200 units, and the corresponding acceptance number is 10.
In other words:
- if the number of defective units is more than 10, the lot has to be rejected
- if the lot is accepted, it is commonly perceived that there is a maximum of 2.5% of defective units in the lot (with a failure risk percentage of less than 5%).
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