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6.4 B-SCAN MEASUREMENT SCREEN
The time-based B-Scan display provides a
cross sectional view of the material being
tested. In this example, the top, or accessible
side of the material is represented as 0.00",
and the bottom, or blind surface at .500".
This mode is used when you need to inspect
the profile of the blind surface. It can also be
a useful view when scanning for pits and
flaws.
The B-Scan display is equipped with a scan
bar representing the overall thickness. The
scan bar gives the user a visual indication
when a flaw or defect passed over during the
scan process.
If you are scanning a pipe, for instance, and
pass over a pit during the process, the scan
bar will quickly deflect and alert you to go
back and search for the defect.
6.5 DIGITS MEASUREMENT SCREEN
The digits display shows the thickness as a
value using a large font size. This view is
used typically when the gauge is being used
as a basic thickness gauge. The digits
display includes the same scan bar as the
B-Scan display.
6.6 CHANGING THE VIEWABLE RANGE
In RF view, RECT view and B-SCAN view, if the waveform around the detection point is not visible
on the display, use one of the following methods to adjust the viewable range of the display:
•
When in RF view or RECT view, change the values of the DELAY and RANGE functions until
the measurement falls inside the viewable range of the display - see instructions below.
•
When in B-SCAN view, change the values of the B-START and B-DEPTH functions until the
measurement falls inside the viewable range of the display. B-START is the equivalent of
DELAY and B-DEPTH is the equivalent of RANGE and the instructions for changing these
values is identical to those for DELAY and RANGE - see instructions below.
•
Use the Auto Find function - see "Auto Find" on page 23.
Note: Even if the waveform is outside of the viewable range of the display, a measurement can be
taken and viewed using the DIGITS view.
DELAY AND RANGE
The Delay is the thickness value from which the A-Scan display starts on the left of the screen. The
Range is used to adjust the value at the right side of the screen. Using these two parameters allows
the user to zoom in to a specific measurement range and increase the level of detail on the display.
For example, if a wall thickness was nominally 25mm and an operator was assessing for corrosion
on this wall they might set the delay to 10mm and the range to 20mm to give a view from 10 to 30mm
depth.
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