Calibration Foils And Standards - Elcometer 456 Operating Instructions Manual

Coating thickness gauge

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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.

Table 1: Correction values as detailed in ISO 19840

Profile according

to ISO 8503-1

Fine

Medium

Coarse

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.

Correction Value

(µm) (Zero Offset)

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