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  Statistical Techniques and 6 Sigma
  AQL vs PPM

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Author Topic:   AQL vs PPM
Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA
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posted 23 April 2000 01:05 PM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
From: David Chan, Jenny Chan - fongchan@ctimail.com

> ...can anyone tell me that the relationship between AQL and PPM..
> somebody told me that 0.065% AQL = 650PPM, is it true ??
>
> i personally think that it isn't , but cannot get proven evident.. can
> u help me ?
>
> tx..
>
> Jenny Chan...

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Marc Smith
Cheech Wizard

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From:West Chester, OH, USA
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posted 23 April 2000 09:27 PM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
I can't help you with the actual numbers off hand, but AQL is Acceptable Quality Level as a per cent. Used in inspection to determine sample size, you decide the AQL level you want and a chart gives you a sample size. Your knowns are the lot size which you look up on the table, and the AQL level you want.

PPM is Parts Per Million which can be converted to a %.

Maybe one of the others can help you out with details and numbers.

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Don Winton
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posted 24 April 2000 10:13 AM     Click Here to See the Profile for Don Winton   Click Here to Email Don Winton     Edit/Delete Message   Reply w/Quote
Acceptable Quality Level (AQL) is defined by ANSI/ISO/ASQC A3534 as follows: "When a continuing series of lots is considered, a quality level which for purposes of sampling inspection is the limit of satisfactory process average."

The associated AQL and Lot Tolerance Percent Defective (LTPD) are summarized graphically by the operating characteristic curve.

·somebody told me that 0.065% AQL = 650PPM, is it true ??

Strictly speaking, no. But, a case could be made that if the AQL was, in fact, 0.065%, then the PPM might be 650. The problem is, AQL is an Acceptable Quality level, not the Actual Quality Level. AQL is the quality level that would be detectable under a certain sampling plan.

Also strictly speaking, the LTPD * 10,000 = PPM nonconforming.

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