1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
Dismiss Notice
You must be a registered member in order to post messages and view/download attached files in this forum.
Click here to register.

Simple Uncertainty Calculator

Discussion in 'ISO 17025 - Calibration and Test Laboratories' started by Agnes Sopel, Mar 10, 2020.

  1. Agnes Sopel

    Agnes Sopel Member

    Mar 3, 2020
    Likes Received:
    Trophy Points:
    We are non-accredited ISO17025 (not a lab-but a manufacturer of uv lamps). We perform final inspection of our product in a test cabinets (internally built for volts and amps readings) and house built measuring gig to check the length of the product.

    We calibrate the two pieces of equipment internally against externally calibrated measuring instruments (calibrators) - fluke meter for test cabinet and metal rule for measuring jig.
    The calibrators are calibrated externally by accredited lab with measurement uncertainty specified.

    We would like to develop our own total uncertainty calculations for our equipment. We have determined that minimum we would include the estimated uncertainty from equipment under test (EUT) - gathered from multiple readings and the uncertainty of the calibrator.

    is there any smart calculator which could (based on those minimum two uncertainties) determine the total uncertainty for us?

    So, we have a base for implementing a decision rule for pass/fail afterwards.

    many suggestions for our situation would help.

    Note, we are not accredited lab, nor required to make ISO17025 uncertainty calculations and certificates. We want to explore more on the subject of uncertainty calculations, as at the moment we don’t include uncertainty at all into our method of internal checks, I.e. Pass or fail is determined by engineer upon one measurement is taken and compared with the calibrator reading, checked with the min and max of the tolerance.

    thank you

  2. RoxaneB

    RoxaneB Moderator Staff Member

    Jul 31, 2015
    Likes Received:
    Trophy Points:
    Ontario, Canada
    I googled "uncertainty calculator" and many hits came up, including links to free calculators where you plug in the data and ways to create your own in Excel. Will any of those meet your needs?
    Andy Nichols likes this.