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Any metrologists out there?

  1. Apr 18, 2008 #1
    My specific questions relate to stacking tolerances and accuracy ratio of 4:1.

    Lets say I have a J thermocouple with a tolerance of 2deg C. That feeds a readout that has a tolerance of 1deg C. My reference standard has a tolerance of 0.5 degC.

    My job is to compare the readout to the standard. Would I use +/-3deg C as my tolerance? And as long as that is at least four time less accurate than my standard may I assume I have a 4:1 accuracy ratio? I think the answer is yes.

    My second question regards balances. How do I determine a reasonable tolerance that includes its surrounding environment using readabilility,linearity & repeatability?

    I've seen several formulas Like 2*sqrt(readability2 +linearity2). My company uses: sqrt(readability2 +linearity2) which is really tight for an environment that is breezy, with 10 deg temp variations, and some vibration.

    Looking foward to responses. Thank you in advance.

  2. jcsd
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