BOLTSCOPE PRO
- Bolt Tension Monitor
141
2) Use the
UP
and
DOWN
arrow keys to scroll through the sub menu
items until
GATE
is highlighted.
3) Press the
LEFT
and
RIGHT
arrow keys to scroll the value. When the
correct gate is being displayed,
proceed to step 8
.
4)
Alternatively
, press the
ENTER
key to display the
Digits Edit Box
.
5) Press the
UP
and
DOWN
arrow keys to scroll the highlighted value.
6) Press the
LEFT
and
RIGHT
arrow keys to scroll the digit locations.
7) Repeat steps
5 & 6
until the gain number is correctly displayed.
8) Press the
OK
key to set the
Gate
value and return to the menu screen,
or
ESC
to cancel entering the
Gate
value.
9) Finally, press the
MEAS
key to return to the measurement screen and
begin taking readings.
12.7 Interpreting the Waveform
One of the most important things to consider, when using the
BOLTSCOPE
PRO
, is how to interpret the waveform in order to choose the proper phase
(polarity) and gain setting. It’s also important to understand what’s taking place
during a basic measurement. The user has the option of selecting the phase
only once during the
L-REF
(reference length measurement). Once the phase is
chosen and the
L-REF
measurement taken and stored for a particular bolt, all the
elongation and loads taken for that particular bolt will assume the sample phase.
At first, this might not seem all that critical. In most cases, with well prepare
bolts, this might very well be the case. While both phases may look fine at first
sight, during the
L-REF
mode, deformations in the joint can occur when a load is
applied to the bolt.
When a load is applied on a bolt, the velocity of the fastener decreases. Any
deformations in the joint (bending) will disrupt the sound path and potentially
cause an overall decrease in signal amplitude. When this occurs, the decrease
in amplitude can cause the
BOLTSCOPE PRO
to lose the first cycle altogether.
