11
This measuring mode is useful when it comes to determining the upper layer in a coating system consisting of several
layers. If the lower layer(s) is (are) known and show(s) an adequately uniform thickness, the coating thickness of this
(these) layer(s) can be set as a negative offset value. After measuring of the total coating thickness the thickness of
the lower layer(s) is subtracted (addition of a negative offset value) and the thickness of the top layer is displayed.
This mode can also be selected for measurements on coated rough metal surfaces. The influence of the roughness is
determined by measuring the uncoated rough metal surface and set as a negative zero offset value. The gauge will
then indicate the coating thickness above the peaks of the rough surface.
4.4.1.
Setting the zero offset value
Procedure:
1.
press this key;
Calibration
appears on the display.
2.
press this key;
Zero setting
appears on the display.
3.
press this key twice until
Zero offset
appears on the display.
4.
press this key; O
ffset setting
appears on the display.
5.
press this key;
Set offset value
appears on the display.
6.
use these keys to adjust the zero offset value; with continued pressing of these keys the set
value increases or decreases faster.
7.
press this key; O
ffset has been set
appears briefly on the display followed by the start
screen with the four dashes – – – – . As indicator the zero offset value can be seen at the
bottom of the display (e.g. Offset=10.0 µm).
After this all readings will be corrected by the zero offset value.