Dakota Ultrasonics DFX-7 plus MANUAL2 - Manual (Page 109)

DFX-7
Ultrasonic Thickness Gauge
105
One Point Calibration
Note: Use the maximum coating sample for the one point calibration first.
1) Physically measure the thicker of the two samples of coating, as close as
possible to the maximum expected coating measurement range, using a set
of calipers or a digital micrometer.
Very Important: If coating measurements will 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 will be
measured as a stand alone material, the calibration must be performed the
same way.
2) Apply a drop of couplant on the transducer and place the transducer in
steady contact with the thicker of the two coating and samples fist. Be sure
that the reading is stable and the repeatability indicator, in the top left corner
of the display, is fully lit and stable. Press the MENU key once to activate
the menu items tab. Press the MENU key multiple times to tab right and the
ESC key multiple times to tab left until the CAL menu is highlighted and
displaying the submenu items.