24
blast cleaning. The calibration uses the smooth surface
technique, and a correction value (zero offset) is applied
to each reading to account for the effect of the
roughened surface; the value depends on the surface
profile - see Table 1.
SET OFFSET.
This screen sets and changes the offset
for different surface roughness This value is used only
with the Zero Offset calibration method.
Note: When the calibration method is changed, e.g. from
Smooth to Rough, the gauge will display a message
(Figure 19).
Figure 19. Recalibration required screen
If the NO softkey is pressed the CAL softkey symbol on
the Readings Screen will flash to warn that calibration
adjustment is still required.
If the YES softkey is pressed the calibration adjustment
procedure is activated - see “Calibration adjustment
procedure” on page 26.
5.2 Calibration foils and standards
Calibration adjustment should be carried out with the
appropriate probe on the same type of metal, the same
curvature and similar finish to the item to be measured.
Table 1: Correction values as detailed in ISO 19840
Profile according
to ISO 8503-1
Correction Value
(µm) (Zero Offset)
Fine 10
Medium 25
Coarse 40
Op_456_2_English.book Page 24 Friday, February 17, 2006 3:35 PM
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