BOLTSCOPE PRO
- Bolt Tension Monitor
143
Good Rule of Thumb: Always look at the height of the positive and negative
cycles separately. Ask yourself if the first cycle (from left to right) is greater in
height (amplitude) than the second. If so, chances are you’ve selected the
correct phase (polarity).
If a situation does occur, as in
Fig.2
above, and you’re able to notice the peak
jump during the process of loading, increasing the gain or lowering the threshold
will generally correct the error. However, if it goes unnoticed, all your
measurements will be in error. Therefore, it’s critical that the user takes the
necessary time to select the proper phase in the initial setup process.
Once again, the Auto Set feature built into the
BOLTSCOPE PRO
will attempt to
optimize and select the polarity for you. Use of this feature is further explained in
the sections that follow.
12.8 Manually Locating the echo
The echo can be manually located by simply adjusting the delay and width
values of the
BOLTSCOPE PRO
. While this is process is very tedious and will
most often not be used because of the
Auto Set
feature, it should be explained
for general control of the instrument. The following procedures outline how to
locate the echo using delay and width.
Adjusting the Delay to Locate the Echo
Note:
The delay should be adjusted to a length slightly shorter than the
physical length of the fastener. If the length of the fastener is unknown, the
user will be forced to scroll the delay until the echo is located. However, if
