The Acceptance Quality Limit (AQL) Chart
The AQL chart is made up of two tables, which you can see below. They are also often referred to as the ANSI/ASQ Z1. 4 tables. And you can use them consecutively to arrive at your sample size and determine the number of allowable defects per lot.
What AQL means?
The acceptable quality level (AQL) is a measure applied to products and defined in ISO 2859-1 as the “quality level that is the worst tolerable.” The AQL tells you how many defective components are considered acceptable during random sampling quality inspections.
How do you use an AQL chart?
4 Steps to determining your sample size and defect tolerance using the AQL table
- Choose your inspection type and inspection level. Your inspection type will be either “general” or “special” shown in the two columns on the first part of the table. ...
- Determine accept and reject points and sample size based on your AQL.
