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Note: If coating measurements are to be made with the coating applied to a metal surface, the
calibration must be done in the same manner, with the samples coupled to a metal surface.
However, if the coating is to be measured as a stand alone material, the calibration must be
performed the same way.
3. Apply a drop of couplant on the transducer and place the transducer in steady contact with the
thinner of the two coating and samples. Be sure that the reading is stable and the repeatability
indicator, in the top left corner of the display, is fully lit and stable.
4. Press MENU/CAL/ COATING 2PT.
5. Press ENTER to display the Digits Edit Box.
6. Press OK to set the coating velocity and return to the measurement screen, or ESC to cancel.
Note: CHECK YOUR CALIBRATION. Place the transducer back on both calibration points. If the
coating thickness readings match the known thickness values of each sample calibration has been
successful and you are now ready to take measurements. If the thickness is not correct, repeat the
steps above.
9 MEASUREMENT - TAKING READINGS
Disclaimer: Inherent in ultrasonic thickness measurement is the possibility that the instrument will
use the second rather than the first echo from the back surface of the material being measured. This
may result in a thickness reading that is TWICE what it should be.
Responsibility for proper use of the instrument and recognition of this phenomenon rests solely with
the user of the instrument.
Other errors may occur from measuring coated materials where the coating is insufficiently bonded
to the material surface. Irregular and inaccurate readings may result. Again, the user is responsible
for proper use and interpretation of the measurements acquired.
9.1 BEFORE YOU START
•
Prepare the surface - see "Condition and Preparation of Surfaces" on page 56.
•
Ensure the correct transducer is selected and set in the gauge - see "Transducer - Setting
Type Of" on page 28.
•
Select the correct measurement mode (P-E, PECT, PETP, E-E, E-EV, CT) - see
"Measurement - Modes" on page 15.
•
Set the zero point of the transducer - see:
•
"Transducer - Zeroing" on page 16 and
•
"Transducer - Zeroing for Coating Only Measurements" on page 17.
•
Calibrate the gauge - see:
•
"Calibrating - for a Material" on page 18 and
•
"Calibrating - for a Coating" on page 20.
•
Choose the measurement view (DIGITS, RF or RECT, or B-SCAN) - see "The Measurement
Screen" on page 26.
9.2 PROCEDURE
1. Apply couplant
For the gauge to work correctly there must be no air gap between the transducer and the
surface of the material to be measured. This is achieved using a couplant.
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