MiniMax
Bolt Tension Monitor
99
22) Press the
and
arrow keys multiple times to scroll through the sub
menu items until
VELOCITY
is highlighted.
23) Press the
key to display the
Digits Edit Box
.
Note:
Enter the Correct Velocity calculated above.
24) Press the
and
arrow keys multiple times to scroll the highlighted
value.
25) Press the
and
arrow keys multiple times to scroll to scroll the digit
locations.
26) Repeat steps
24 & 25
until the
VELOCITY
value is correctly displayed.
27) Press the
key to set the
Velocity
and return to the menu screen, or
to cancel entering the
Velocity
.
28) Finally, press the
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
MiniMax
.
Summary of Contents for MiniMax v2.0
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