Quality inspection standard (AQL)
Inspecr (ISR) default ANSI / ASQC Z1.4 as quality acceptance criteria, using this method of sampling batches of products, the decision of the batch of products is qualified, without all the batches of each product are tested, the sample acceptance criteria are widely used around the world.
Inspection sampling
Inspection sampling was used to determine whether to accept or reject a batch of products shipped. First batch of products shipped from a randomly selected sample and test the selected sample, and then OK to accept or reject the batch shipping products based on the results.
Batch or bulk product is a collection of many products, its size, type, production conditions and time consistent sample will be taken to determine the lot / batch product has reached the acceptance criteria.
General sampling inspection standards
Sampling standards represent an accurate sampling method as a whole. For a given amount of a batch of products, improve the quality of the sample standard means increasing the number of samples.
General quality sampling standards are divided into I, II and III.
Inspecr (ISR) quality sampling standard default class II. However, the specific selection criteria rating must be based on customer sampling required or authorized to be!
Number of samples
AQL standard grade and corresponding number of the actual number of extracted samples of the goods specified in the appropriate basis for customers.
Acceptable level of product quality standards and defect classification
Under normal circumstances, the defects found during the inspection are divided into three categories:
- Very serious defects (CRITICAL)
- Serious flaws (MAJOR)
- A slight defect (MINOR)
Very serious defects
Very serious defect is likely to cause to the end user safety and health effects of defects. This product is fully or no corresponding function.
Acceptance quality standard Inspecr very serious defects default value is zero.
Serious flaws
Serious defects without compromising security situation may lead to reduced availability of product functionality or appearance of the defect was completely damaged.
Acceptance quality standard Inspecr serious flaws default is 1.5. (Specific be customer specified rating)
Minor defects
· Minor defects will not damage the normal use of the product or deviate from the standards.
· Minor defect quality standards is a process defects.
Inspecr (ISR) quality standards of acceptance minor defects default value is 4.0. (Specific be customer specified rating)
How to determine the number of samples and the acceptance number?
Assume for a total of 1000 batch product inspection, according to the quality standards of acceptance G- II, The following table shows the number of samples should be 80. According to Critical 0, Major 2.5, Minor AQL 4.0, this batch of product defects acceptable criteria: number of very serious flaws 0, the acceptable number of serious shortcomings 3, minor defects acceptable number of seven. If the randomly selected sample no serious defects, serious defects more than 3 or more than 7 minor defects, of the batch are all rejected.
