Dakota Ultrasonics
102
22) Press the
UP
and
DOWN
arrow keys multiple times using the left
button wheel to scroll through the sub menu items until
VELOCITY
is
highlighted.
23) Press the
ENTER
key to display the
Digits Edit Box
.
Note:
Enter the Correct Velocity calculated above.
24) Press the
UP
and
DOWN
arrow keys multiple times using the left or
right button wheel to scroll the highlighted value.
25) Press the
LEFT
and
RIGHT
arrow keys multiple times using the left or
right button wheel to scroll to scroll the digit locations.
26) Repeat steps
24 & 25
until the
VELOCITY
value is correctly displayed.
27) Press the
OK
key to set the
Velocity
and return to the menu screen, or
ESC
to cancel entering the
Velocity
.
28) Finally, press the
MEAS
key to return to the measurement screen.
The
ultrasonic length displayed should now match the known physical length.
10.3 Stress factor calibration
The sonic stress factor is an empirically determined value for the bolt material or type
of bolt being measured. It expresses the ratio of the actual elongation, or stretch, of
the bolt, to the apparent ultrasonic change in length. Since the change in ultrasonic
length is approximately 3 times the change in physical length, due to the change in
velocity, a stress factor must be applied to correct the ultrasonic length in the
MAX II
.
Summary of Contents for MAX II
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