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.
