Guest
 Posted: Sat May 22, 2026 5:19 am Post subject: Calculating PPM |
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| Hi,
I am a new QA Engr and have been asked by my manger to establish a PPM calculation methodology for our outgoing QC test. Do I have to use certain confidence limit i.e. 60%, 90% to come up with the methodology? Or just have to use the simple calculation for parts per million? What do you recommend? Am I thinking too hard for a simple problem? Any suggested reading? Thanks for your help. Rgds, Curious Guest |
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Guest
| Posted: Mon May 24, 2026 5:01 pm Post subject: |
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| Curious Guest,
What you probably need is this: EIA Standard 554 - Method Selection for Assessment of Nonconforming Levels in Parts Per Million (PPM) (ANSI/EIA-554-A-96). The spec can be bought online. I don't know if you can find something off the net for free that explains this. Achilles |
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