© PCE Instruments
13
Multi-point Calibration
a.
In measure mode, press “CAL key” once to enter calibration mode.
b. Zero calibration according to the previous chapter and then lay the calibration foil on an
uncoated sample.
c. Apply the probe and raise it after one beep. A reading will be shown.
Press “Up Key” or
“Down Key” to increase or decrease the readings or hold the key for changing continuously
until the required foil thickness value shown. The LCD will show current calibration point
“Ptn X ”. The “X” will be flashing.
d. Apply the probe to the test sample several times, and every time raise the probe, if you press
“CAL Key”, after “beep...beep beep...”, it will establish a mean value for current calibration
point.
e. Press “Left Key” to confirm and end current calibration point, and the “X” will be steady. Or
press “Right Key” to cancel and end current calibration point.
f. For more calibration points, use another calibration foil and repeat the step c, d and e.
g. Finished. Press “CAL Key” to exit calibration mode.
Note:
a. Each group has individual zero calibration and multi-point calibration.
b. When calibration up to 4 points, user must clear the finished points firstly to restart.
c. Readings measured before will not be affected by new calibration.
d. In calibration mode, measuring will not be affected.
e. Recommended to work in single measure mode when calibrating.
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 gauge should be calibrated according to
“Multi-point Calibration”. Use a
smooth calibration sample with the same curvature radius and the same substrate as the
later measuring sample.
b. Take approx. 10 readings on the uncoated, shot-blasted sample to produce mean value A.
c. Take approx. 10 further readings on the coated, shot-blasted test sample to produce mean
value B.
d. The coating thickness is T=(B-
A)±S. The “S” is the greater standard deviation of step b and
step c.
Method two:
a. The gauge should be calibrated according to
“Multi-point Calibration” on the shot
blasted sample.
b. Take approx. 10 readings on the test sample to produce the mean value that used as final
coating thickness.