DFX-7
Ultrasonic Flaw Detector
15
6) Use the
UP
and
DOWN
arrow keys to scroll through the sub menu items
until
ZERO COATING
is highlighted.
7) Press the
ENTER
key to display the confirmation screen.
8) Press the
OK
key to zero the coating and return to the
PRB
menu, or
ESC
to cancel the coating zero process.
9) Press the
MULTI MODE
key once to activate the measurement mode
options.
10) Use the
UP
and
DOWN
arrow keys to scroll through the sub menu items
until
Coating On (PECT)
is highlighted.
11) Press the
ENTER
key to select the measurement mode and return to the
measurement screen, and begin taking readings.
2.6 Coating Calibration
The
DFX-7
has been preset to a default coating velocity of 0.0850 in/µsec (2159
m/sec). This will be very close to the most common coating material velocities used
in the field. If the velocity of the coating is known, and different than the above
default setting, the user can simply enter the coating velocity into the
DFX-7
.
However, if the velocity is unknown, the
DFX-7
can also be calibrated to a specific
coating sample/type using the 1pt calibration option in PECT (pulse-echo coating)
mode, or a two point calibration is
CT (coating only)
mode. For the purpose of this