CEMB USA C72_2 (A) - Manual (Page 18)

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5.9 - Eccentricty measurement (option)
The figures are significantly enlarged to highlight the external surface of the tyre and the wheel rotation axis.
Fig. A highlights the total Peak-Peak eccentricity measurement, defined as the maximum radial offset of the surface
of the tyre.
Fig. B highlights the 1st harmonic eccentricity measure-
ment, i.e. the eccentricity of the rim “reflecting” the shape
of the tyre, to calculate the averages values of local offset
of the tyre from roundness.
It is evident that the P-P measurement is
normally higher than the 1st harmonic
measurement. Tyre manufacturers usually provide two
different tolerances for the two types of eccentricity.
At the end of a balancing spin, eccentricity measurement of the tyre can be performed automatically using the
SONAR sensor placed on the guard. To enable measurement at the end of every spin, see the section
MENU
FUNCTION CONTROL .
Measurement results:
The value of the first harmonic with the relative phase is
displayed.
Hold down the button to display the Peak-Peak
value.
Release the button to return to the display of the
first harmonic value.
BACK TO MEASUREMENT WINDOW.
N.B.: The eccentricity measurement is valid up to max. tyre Ø of 1000 mm.