Checkline DFX-7 User Manual
Page 21
DFX-7
Ultrasonic Flaw Detector
17
6) Repeat steps 4 & 5 until the velocity number is correctly displayed.
7) Press the OK key to set the coating velocity and return to the menu screen,
or ESC to cancel entering the coating velocity.
8) Finally, press the MEAS key to return to the measurement screen and
begin taking readings.
Known Coating Thickness
When the exact velocity of a coating is unknown, the user has the option of
performing a one point calibration on a sample of the coating with a known thickness
to determine the sound velocity. It would be very handy to carry a set of mechanical
calipers to use in conjunction with the DFX-7 for calibration in the field:
Using a Coating Sample to Calibrate
1) Physically measure a location on a coating sample using a set of calipers or
a digital micrometer.