TQC LD0800 - 5.3.3. Shot-blasted Surfaces; 5.3.4. Clear Calibration

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NOTES -Each group has individual zero calibration and multi-point calibration.
-When calibration up to 4 points, user must clear the nished points rstly to restart.
-Readings measured before will not be aected by new calibration.
-In calibration mode, measuring will not be aected.
-Recommended to work in single measuring mode when calibrating.
5.3.3. Shot-blasted Surfaces
The physical nature of shot-blasted surfaces results in coating thickness readings that are too
high. The mean thickness over the peaks can be determined as follows.
Method one:
a. The instrument should be calibrated according to 5.3.2. (one or more points calibration). Use a
smooth calibration sample with the same curvature radius and the same substrate as the
sample to be measured.
b. Take approx. 10 readings on the uncoated, shot-blasted sample to produce the mean value A.
c. Take approx. 10 further readings on the coated, shot-blasted test sample to produce the mean
value B.
d. The coating thickness T = (B-A) ± S. The “S” is the highest standard deviation of step b
and step c.
Method two:
a. The instrument should be calibrated according to paragraph 5.3.2.
(one or more points calibration) on the shot-blasted sample.
b. Take approx. 10 readings of the test sample to calculate a mean value which can be used as
nal coating thickness.
5.3.4. Clear Calibration
The calibration can be cleared to start new applications. When there is an incorrect calibration, it
should also be cleared.
a. Press “Left Key” once to enter into menu mode (”Root” directory)
b. Press “Up Key” or “Down Key” to activate “Calibration” item, and press “Left Key” once to enter .
c. Press “Up Key” or “Down Key” to activate “Clear All” item (Note: you can also clear only part of
them, please see the menu for details), and press “Left Key” once. A dialog box will be
displayed.
d. Press “Left Key” once to conrm the selection and go back, or “Right Key” to cancel and
go back.
NOTES All operations are limited within current work group, the other groups will not be
aected.
EN