Components of a Calibration Certificate

Measurement Uncertainty

In an ideal world, the measured mass of a sample measured in one country would be exactly the same as the measured mass of the same sample measured in another country.

Unfortunately there are many factors that can affect a measurement and therefore the two measurements will differ by a certain amount. The factors that influence the measurements are evaluated and an uncertainty of measurement is determined.

Taking this uncertainty into account helps us to make decisions about the accuracy of our measurements and therefore, for example, the acceptance or rejection of a sample based on its specification.

One of the factors used in determining the overall uncertainty of the measurements is the uncertainty of measurement value quoted on the calibration certificate. This should be used in your own calculations for the uncertainty of any measurements that you make with the instrument. Another value to be used is the reference made to the 'confidence level (CL)'. This is used in the statistical calculations of the uncertainty of measurement.

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