Estimating measurement uncertainties

Direct measurement of quantity Y

Most of the time Type A and Type B uncertainties must be combined so that:

that is to say

with



   

    Table 3
Table 3 [zoom...]

Case of a single measurement

Since only one measurement is performed, urép=0 hence :

An electric current is measured just once with an ammeter with a standard uncertainty of 2.9 mA. Previous measurement results have given a standard uncertainty of 5.2 mA

The standard uncertainty on the value of the measured intensity I is :

Case of replicate measurements

In this case the repeatability uncertainty is evaluated from the N replicate measurements.

The same measurement of current is performed 9 times with an ammeter with a standard uncertainty of 2.9 mA.

No other information is given or available.

The standard uncertainty on the value of the measured intensity I is :

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