Trotec BB20 User Manual

8 EN
layer thickness measuring device BB20
Zero point calibration
ü An uncoated sample is required.
1. Place the sensor onto an uncoated sample. The calibration
sample is to be identical with the actual sample in terms of
material composition, shape and surface condition.
ð The following message will be displayed:
<x.x μm>
2. Lift the sensor again and keep it away from the sample (at
least 10cm).
3. Press and hold the Zero button(4) for approx. 2seconds.
ð The following result appears on the display:
<0.0μm>
CAL1
ZeroY
ð The calibration is terminated.
One-point calibration
This calibration is suited for high-precision measurements, e.g.
for thin coatings.
ü A calibration film, a coated and an uncoated sample are
required.
1. Activate the calibration mode as described before.
2. Carry out a zero-point calibration.
3. Place the calibration film on an uncoated sample.
4. Place the sensor on the sample.
ð The measurement is effected.
5. Lift the sensor again.
6. Adjust the required film thickness by using the Down/
Right(3) or the Up/Left(8) button. The film thickness
should be at least the size of the estimated coating
thickness.
7. Repeat this step several times.
8. Now carry out the measurement on a coated sample.
9. Press the Zero button(4) to adopt the current calibration.
10. To exit the current calibration, press the Blue button(2).
Two-point calibration
This calibration is especially suited for measurements on rough
surfaces or for high-precision measurements.
ü You need two films of different film thickness. The thicker
film should be approx.1.5 times thicker than the thinner
film.
1. At first, carry out a zero-point calibration.
2. Using the first film, carry out a one-point calibration.
3. Repeat this step with the second film.
4. Place the sensor onto the coating that is to be measured.
After a brief acoustic signal is emitted, you can lift the
sensor again.
ð The measured value appears on the display.
Calibration on radiated surfaces
Values of layer thickness measurements carried out on radiated
surfaces are usually too high. The average thickness can be
determined as follows:
Method A
1. Carry out the steps for one-point and two-point calibration
as described above. Use a smooth sample with the same
surface curvature and material type as the measuring
object that is to be used later on.
2. In order to determine the average value Xo, carry out
approx.10 measurements on the uncoated sample.
3. Afterwards, carry out approx.10 measurements on the
coated sample to determine the average value Xm.
ð The difference between both average values is the
average coating thickness Xeff. Take the standard
deviation of both values Xm and Xo into account.
Xeff= (Xm - Xo)±S
Method B
1. Carry out a zero calibration with approx.10measurements
on an uncoated sample.
2. Afterwards, carry out a film calibration on the uncoated
sample.
3. Repeat this calibration with films of different thicknesses
(max. thickness50μm). Together, these films should be as
thick as the assumed layer thickness.
ð The layer thickness can be read from the display.
Method C
1. Carry out the steps for two-point calibration with two films
as described above.
2. Use several 50μm films to approach the actual surface as
precisely as possible.
ð The layer thickness can be read from the display.

Trotec BB20 Specifications

General

Brand	Trotec
Model	BB20
Category	Measuring Instruments
Language	English