Dakota Ultrasonics CMX - Manual (Page 63)

CMX High Performance Material & Coating Thickness Gauge
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7.3 Adjusting the B-Scan Start (B-START) & Depth (B-DEPTH)
In order to use the B-Scan and Scan Bar features of the CMX effectively, the starting
depth and overall depth must be setup correctly. This can be adjusted using the B-
START and the B-DEPTH features of the CMX. The B-START refers to the starting
depth or thickness value displayed. Example: If you want your B-Scan or Scan Bar
to start at a zero thickness value, then B-START must be set to 0.000”. If you want
the B-Scan and Scan Bar to start displaying at .125”, then B-START must be set to
.125”. B-DEPTH represents overall viewable thickness range being tested.
Example: If your measuring tank walls with a total thickness of .300”, and your B-
START has been set to 0.000”, you might consider setting your B-DEPTH value to
something like 0.400” to cover the entire thickness range being tested. You might
also consider B-DEPTH as a zoom feature for both the B-Scan and Scan Bar. Why?
Because the larger the overall thickness range view (B-DEPTH), the smaller the
noticeable shifts in the Scan Bar and B-Scan presentation. Therefore, it’s best to set
the B-START and B-DEPTH to reasonable values that zoom in and optimize your
graphic presentation.
Starting depth (B -START)
The starting B-START, or starting depth, is the starting thickness value. Often times
this value will simply be set to zero in order to start measuring at 0.000”. The only
time this value will be set to something other than zero, is if the user needs to zoom
in even closer. When will this be the case? If the user is testing a material that’s 1
inch in thickness and knows that the potential corrosion is only on the back surface of
the material and not possibly deeper than .200”. In this case, the user may wish to
set the B-ST at .700” to zoom in closer to the actual area being tested. In turn, the B-
DEP might be set at 1.100” in order to cover the entire range respectively. This will
offer the user better resolution for both the B-Scan and Scan Bar graphical
presentations.
Note: Once the range is set, it will remain the same for all the views respectively.
The procedures to adjust the starting depth (B-START) are outlined below: