User Manual

I 0391 - 18

I 0391 - 19

A B

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5.9 - Eccentricty measurement (option)

The gures are signicantly enlarged to highlight the external surface of the tyre and the wheel rotation axis.

Fig. A highlights the total Peak-Peak eccentricity measurement, dened 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 “reecting” 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 rst 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

rst harmonic value.

BACK TO MEASUREMENT WINDOW.

N.B.: The eccentricity measurement is valid up to max. tyre Ø of 1000 mm.