DMTA-10004-01EN, Rev. D, November 2016
Basic Operation
79
5. Select YES to answer the Enable THRU COAT? prompt.
5.5.2 Performing a THRU-COAT Calibration
The calibration procedure for a THRU-COAT probe is similar to the procedure for
other probes. As for a normal calibration, you need two uncoated samples with
accurately known thin and thick thicknesses to perform the following calibration
procedure. The difference is that towards the end of the procedure, you can press
[CAL VEL] a second time to calibrate the coating thickness measurement on a sample
with an accurately known coating thickness.
To perform a THRU-COAT calibration
1. Ensure that the THRU-COAT function is enabled (see “Enabling the THRU-
COAT Function” on page 78).
2. Couple the transducer to the thick sample.
3. Press [CAL VEL].
4. When the reading is stable, press [ENTER].
5. Using the arrow keys, edit the thickness value to match the known thickness of
the sample.
6. Couple the transducer to the thin sample.
7. Press [CAL ZERO].
8. When the reading is stable, press [ENTER].
9. Using the arrow keys, edit the thickness value to match the known thickness of
the sample.
10. If the coating thickness measurement accuracy is important for your application,
perform the following actions (omitting this step does not affect the accuracy of
the metal thickness measurement):
a) Press [CAL VEL] again.
b) Couple the transducer to the coated sample.
c) When the reading is stable, press [ENTER].
d) Using the arrow keys, edit the thickness value to match the known coating
thickness of the coated sample.
11. Press [MEAS] to complete the calibration.
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