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Thread: Measurment Discrimination

  1. #1
    Associate Engineer
    Join Date
    Feb 2013
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    Measurment Discrimination

    I am looking for information on what the insdutry standard is with regard to the accuracy (discrimination) of measurment and test equipment. I am told that generally for tolerances of less than .001 in. measuring instruments should discriminate within 10 %? Any information is greatly appreciated.

  2. #2
    Project Engineer
    Join Date
    May 2011
    Location
    Michigan
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    78
    Yes, I think the 10% rule has been around for a long time. If you are talking about physical gages (functional go/no-go gages, etc.) the standard to look to would be ASME Y14.43. In there I know for sure that the 10% rule is discussed, but they are careful to use the word "recommended" rather than the more stringent "shall."

    But if you're not talking about functional gages, there are several other ASME standards that intersect with the 10% idea. Check out the follow ASME brochure:

    http://fileS.asme.org/Catalog/Codes/PrintBook/25586.pdf

    It's a promotional thing for their actual standards regarding measurement uncertainty, and those will cost some $, but hopefully reading the brochure will steer you in the right direction.

  3. #3
    Administrator Kelly Bramble's Avatar
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    Feb 2011
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    Bold Springs, GA
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    2,237
    10% for inch units, 5% for mm units.....

  4. #4
    Associate Engineer
    Join Date
    Feb 2013
    Posts
    2
    Thank you for the information it was very helpful!

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