How to draw up the 5M diagram
Assessing electrical measurement uncertainties

This diagram can be used to analyze a measurement process and to determine the basic uncertainties arising from one of the following five causes:

• measuring equipment ;

• the measurement method ;

• the material measured ;

• the environment in which the measurement is performed ;

• the manpower used, i.e. the operator carrying out the measurement.

In the example below, such a diagram is shown for the measurement of a resistance of around 120 Ω.