Manual
11
Ultrasonic indenter and recesses
During
measurements the inspection stamp entrudes minimally within the material. The indentation depth (H)
and the mean value of the dialog lengths (d) of the various probes of the ultrasonic hardness tester can
be reduced with increasing value.
Material hardness (HV)
Depth (µm)
800
10
600
11
300
16
Material hardness (HV)
Diagonal line of the impression of the inspection stamp
800
68
600
79
300
111
Note: The table only shows the values for the 20 N probe.
Minimum thickness of the tested object
Despite the low penetration depth the workpiece needs to have a minimum thickness so that the
instrument is not damaged. The minimum thickness of the material should be at least ten times higher
than the penetration depth.
Penetration depth h:
F: preset test force
HV: Vickers hardness of the material
Minimum thickness t: t
≤ 10 h
