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Measurement accuracy

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  • February 6, 2007 at 4:16 pm #46042

    Máriusz Ódor
    ★ 10 Years ★
    Participant

    Hi,
    I have a question in relation with the accuracy of a measurement equipment. I have a scale, type: QA65EDE-D.
    Weighing capacity: 64 kg.                                                         Readability: 1g.                                                                     Repeatability (standard deviation): =< +-2g.                           Linearity: =< +-2g. 
    From these datas how can I calculate the accuracy of the equipment? For example I simple have to add the standard deviation and linearity failure or I have to use a different way of calculating? In this case the failure is less than +-4g at every value?
    Thanks,
    Regards,
    Máriusz Ódor.

    0
    February 6, 2007 at 7:49 pm #151660

    Dr N Mackertich
    ★ 10 Years ★
    Participant

    This very good article may help you:
    http://www.spcpress.com/ink_pdfs/Good%20Data,%20Bad%20Data.pdf

    0
    February 6, 2007 at 8:18 pm #151661

    Jim Shelor
    ★ 10 Years ★
    Participant

    Dear Mariusz Odor,
    You cannot get accuracy (bias) from any of the data you have stated.
    If you have Minitab, there is a function under Stat>>Quality Tools>>Gage Study>>Linearty and Bias that will provide the answer you seek.
    Best regards,
    Jim Shelor

    0
    February 7, 2007 at 9:24 am #151680

    Máriusz Ódor
    ★ 10 Years ★
    Participant

    OK.
    Thanks for your help.
    Best regards,
    Máriusz Ódor

    0
    February 7, 2007 at 9:44 am #151679

    Máriusz Ódor
    ★ 10 Years ★
    Participant

    OK.
    Thanks.
    Best regards,
    Máriusz Ódor

    0
    June 30, 2007 at 1:42 pm #158085

    Ranjan
    ★ 10 Years ★
    Participant

    more detail for attribute&attribute formula, accuracy measurement

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