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The BHN (BarkHausen Noise) is the result of sudden changes in the magnetizations of ferromagnetic materials under changing external magnetic fields. The BHN depends on the amplitude and frequency and orientation of the exciting magnetic field. From these dependences various material properties can be deduced which are correlated to the hardness, grain size, microstructure and local stress of the materials. These correlations allow the determination of important mechanical properties, and for this reason BHN is widely used for nondestructive testing in bridges, railroads, and industrial containers. Barkhausen noise measurements are widely used for non destructive testing in industrial applications. Standalone equipments would typically provide the root mean square value of the noise under a selected amplitude excitation. Much greater flexibility can be achieved with a computer controlled setup. Virtual instruments of the graphical programming language LabVIEW of National Instruments (Austin, Texas, USA) are used for the Barkhausen noise measurement.