Testing
In conformance with international standard ISO2859-1.
Acceptable Quality Limits
Buried away in Section 12, table 10 of the DIN-EN 16983 standard you might have come across the following reference - "AQL value = 1". AQL stands for Acceptable Quality Limit and refers to the ANSI ASQ Z1.4 table used in Quality Control inspections for determining both sample sizes and acceptable rejections during the inspection of a large batch of production items. This AQL sampling plan is designed to help in determining the right sample size for inspection and the acceptable number of defects, given the inspection type, the inspection level as well as the the AQL.
Table 1 - Sample Size Letter Codes, are used to extract data from Table 2. using the Letter Code on the Left and the corresponding AQL column, which for Disc Springs is 1.0
Table 2 - Sampling and Acceptance Limts provides the required sample size for inspection and the acceptable number of defects allowed before rejecting the entire batch.
AQL CALCULATOR
Independent 3rd Party Testing
Being prepared is key, and this includes not only setting up the jigs to test the stack, but agreeing on the stack load testing cycle and programming this beforehand.
So once we have agreed on the sample size and expected testing cycle, we have an internationally accredited independent 3rd Party testing facility conduct the witness tests.
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Independent & Witnessed Testing - In this instance you can here the SGS Metlab official explaining things to the client.
The witness testing data goes into the data pack, we generally recieved the Load Characteristic Data the same day once it has been downloaded and verified by ther labs own internal QA.